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Review of Research Advance on Cold-atom Gravimeter BAI Jin-hai, MA Hui-juan, HU Dong, WANG Yu Journal of Astronautic Metrology and Measurement    2023, 43 (5): 1-10.   DOI: 10.12060/j.issn.1000-7202.2023.05.01 Abstract （197）      PDF（pc） （4579KB）（2645）       Knowledge map    Save The cold atom gravimeter uses laser cooling,atomic interference manipulation,and other technologies to achieve absolute gravity acceleration measurement.It is a new type of quantum sensor that has developed rapidly over the [JP2]past three decades.Currently,its measurement sensitivity has exceeded that of traditional laser interference absolute gravimeters,and the measurement uncertainty has reached the same level.In metrology traceability,basic scientific research,geophysics,resource exploration,autonomous navigation and other aspects have important application value.Analyzes the principle of cold atom gravimeters,introduces the research progress and development trend of cold atom gravimeters,and analyzes and combs the research direction of cold atom gravimeters,especially the key points in dynamic application scenarios. Related Articles | Metrics | Comments（0）

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Quantum Precision Measurement Technology and Its Typical Applications in Measurement Field GE Meng, ZHANG Tie-li, LIU Hao, SONG Yan, WU Chen Journal of Astronautic Metrology and Measurement    2023, 43 (6): 1-6.   DOI: 10.12060/j.issn.1000-7202.2023.06.01 Abstract （313）      PDF（pc） （4203KB）（1650）       Knowledge map    Save Quantum precision measurement is based on the basic principle of quantum mechanics by using the interaction between light，atoms and magnetic field to measure physical quantities.The concept of quantum precision measurement and the technical principles in quantum precision measurement are described as a starting point,and typical applications of quantum precision measurement technology in the field of measurement are investigated.The principles,applications,and development status of femtosecond optical frequency comb technology,precision measurement technology for atomic ensemble and quantum light field,and quantum enhancement measurement technology based on nonlinear interference are analyzed.It could provide reference for the development of measurement technology in China. Related Articles | Metrics | Comments（0）

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Review of Infrared Sea Surface Small-target Detection Algorithm ZHA Yue, Tang Ye Journal of Astronautic Metrology and Measurement    2022, 42 (6): 57-65.   DOI: 10.12060/j.issn.1000-7202.2022.06.10 Abstract （211）      PDF（pc） （2963KB）（1616）       Knowledge map    Save Infrared imaging technology is a passive detection technology that has been widely used in various fields such as land,sea,air and space,with the advantages of strong resistance to external interference and all-weather target measurement.Infrared imaging tracking and measurement systems have been used in a large number of applications in the measurement of surface vehicle parameters.Infrared sea surface small-target detection technology is an important part of processing infrared measurement images。The accuracy and efficiency of the interpretation results can be improved with suitable detection methods.By analyzing the characteristics of the background and target in the infrared sea surface small target image and the technical difficulties of the complex recognition of infrared sea surface small-targets,two infrared small-target algorithms based on deep learning and traditional methods are compared.The principle,steps and advantages of the traditional algorithms are elaborated,and the future development trend of infrared small-target detection algorithms is analyzed. Related Articles | Metrics | Comments（0）

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Design of Portable Telecontrol Telemetry and Data Transmission Test Equipment Based on ADRV9009 ZHANG De-zhi, LI Jin-long, SONG Zhao-han Journal of Astronautic Metrology and Measurement    2023, 43 (4): 75-80.   DOI: 10.12060/j.issn.1000-7202.2023.04.12 Abstract （63）      PDF（pc） （2756KB）（1018）       Knowledge map    Save The commonly used TT&C test equipment adopts a standardized case with a shelf structure,which has problems such as large size,heavy weight,difficult disassembly,and inconvenient to field test.To solve these problems,a portable telecontrol telemetry and data transmission test equipment based on Zynq7100+ADRV9009 is designed.The design architecture,hardware scheme and software configuration flow of the equipment are given,and the wireless transmission link is reviewed.The results of system test show that the portable TT&C equipment has the characteristics of small volume,light weight and stable operation,and can meet the requirements of aircraft telecontrol telemetry and data transmission links field test. Related Articles | Metrics | Comments（0）

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Theory and Simulation Analysis of a Cross-correlation Method for Measuring Phase Noise SHEN Xiao-yu, ZHANG Liang, CAO Xu, LI Hong-yu, LIU Yu-xuan, YUAN Yan Journal of Astronautic Metrology and Measurement    2022, 42 (3): 60-67.   DOI: 10.12060/j.issn.1000-7202.2022.03.11 Abstract （266）      PDF（pc） （1618KB）（878）       Knowledge map    Save Phase noise measurement is an important research in the field of radio measurement.With the development of signal generators and other signal instruments and equipment,there are higher requirements for phase noise measurement technology.This paper introduces the theory and simulation analysis of measuring phase noise by cross-correlation method,explains the principle of suppressing uncorrelated interference noise by cross-correlation method through theoretical derivation,establishes a simulation analysis model based on MATLAB on the basis of theoretical results,and verifies the improvement degree of the bottom of system noise under different cross-correlation times,we further analyzed the influence of dual channel correlation on cross-correlation calculation results and obtained the corresponding simulation results,which provides a reference for relevant engineering design. Related Articles | Metrics | Comments（0）

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Review of Dynamic Data Processing Methods for Engine Test LIU Zi-xing, Gao Jun, SONG Jiong-liang, LIN Meng, YANG Yi Journal of Astronautic Metrology and Measurement    2023, 43 (4): 66-74.   DOI: 10.12060/j.issn.1000-7202.2023.04.11 Abstract （59）      PDF（pc） （1466KB）（736）       Knowledge map    Save Engine test dynamic data usually contains important information such as vibration and pulsating pressure of key parts,which is an important reference index for evaluating engine performance,component characteristics and optimal design.The advantages and disadvantages of several methods suitable for dynamic data processing are summarized,such as fast Fourier transform,wavelet analysis,wavelet packet analysis,Hilbert-Huang transform,and the application of these methods and their combination in dynamic data analysis and processing are introduced. Related Articles | Metrics | Comments（0）

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Research on Instantaneous Dose Rate Effect Based on TCAD Simulation CHU Fei, CHEN Hong-zhuan, YU Chun-qing, ZHENG Hong-chao, WANG Liang, YANG Cheng-yuan Journal of Astronautic Metrology and Measurement    2022, 42 (4): 83-87.   DOI: 10.12060/j.issn.1000-7202.2022.04.15 Abstract （84）      PDF（pc） （1526KB）（684）       Knowledge map    Save A TCAD simulation method is proposed to simulate the instantaneous dose rate effect of a radiation-hardened SRAM with a million gate level of 0.18μm CMOS technology.Simulation results show that the protection ring layout design can effectively improve the instantaneous dose rate effect performance of the circuit.Using the dose rate radiation source,the experiment verification of simulation effectiveness is carried out.Simulation and experiment results show that the error between the photocurrent peak obtained by TCAD simulation and the photocurrent peak obtained by experiment is less than 5%，which confirms the effectiveness of the simulation method for studying the instantaneous dose rate effect. Related Articles | Metrics | Comments（0）

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Overview of Magnetic Measurement Development Based on Quantum Measurement Technology LI Xiaofang, CHENG Huafu, BAO Zhong, WANG Dongping, ZHANG Feng Journal of Astronautic Metrology and Measurement    2024, 44 (1): 7-13.   DOI: 10.12060/j.issn.1000-7202.2024.01.02 Abstract （53）      PDF（pc） （743KB）（680）       Knowledge map    Save Aiming at the development history of magnetic quantum measurement technology and the capacity of magnetic quantum metrology standards established based on quantum magnetometers in various countries,proton magnetometers,Nuclear Magnetic Rsonance(NMR) magnetometers,and optical pump magnetometers that have been applied to magnetic quantum metrology standards is studied;Presenting the principles of quantum magnetometers such as CPT magnetometer,SERF magnetometer,diamond NV color-center magnetometer;By summarizing the domestic and international development status of quantum magnetometers with high accuracy,low magnetic field noise and good stability tandards,analyzing the easibility and advantages of replacing the current magnetic parameter metrology standards by using the technical characteristics of various quantum magnetometers;It proposes the potential research direction of quantum measurement technology in the quantization of magnetic measurement standards in the future. Related Articles | Metrics | Comments（0）

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Development Status and Metrology Prospect of Terahertz Quantum Correlation Imaging and Quantum Dot Detector LI Hong-guang, WANG Yuan-bo, LIAO Wen-tao Journal of Astronautic Metrology and Measurement    2023, 43 (5): 41-46.   DOI: 10.12060/j.issn.1000-7202.2023.05.06 Abstract （96）      PDF（pc） （2451KB）（650）       Knowledge map    Save The cross research between quantum technology and cutting-edge disciplines such as terahertz technology has led to the emergence of disruptive new system devices such as terahertz quantum correlation cameras and quantum dot detectors,expanding the space for new quality and new domain defense applications.Compared to traditional imaging technology,terahertz quantum correlation imaging based on quantum technology exhibits unique advantages in imaging speed,imaging resolution,and other aspects.The terahertz quantum correlation imaging system is based on terahertz emission sources,detection systems,masks,algorithms,etc.,achieving compression sensing,time resolution,Fourier transform,and other imaging technologies.In addition,a review was conducted on terahertz quantum correlation imaging systems and quantum dot detectors,and corresponding research on terahertz quantum correlation imaging and measurement calibration technology of terahertz quantum dot detectors was explored.By proposing metrological problems and solutions,which provides the application prospects of terahertz quantum detection and imaging metrology technology. Related Articles | Metrics | Comments（0）

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Antenna Planar Near-field Measurement System with Frequency 110 GHz~170 GHz LIU Xing-xun, CHENG Xian-you, HUANG Cheng-zu Journal of Astronautic Metrology and Measurement    2022, 42 (5): 13-16.   DOI: 10.12060/j.issn.1000-7202.2022.05.03 Abstract （87）      PDF（pc） （4674KB）（591）       Knowledge map    Save In order to meet the requirement of antenna calibration accurately with frequency range (110~170)GHz,An antenna plane near-field measurement system based on robot automatic scanning is designed.The system is composed of a vector network analyzer,spread spectrum modules,mechanical arm scanning frame,small optical platform and a scanning probe etc.Parameters of measurement setting and scanning trajectory control of manipulator are realized by testing software.The amplitudes and phases of test points on the scanning surface are collected by software,which is calculated using Fourier near-far field transformation algorithm.Then the antenna gain directivity pattern is obtained.A standard gain horn as an antenna under test is tested by the antenna planar near-field measurement system.The results are very consistent with those measured in far-field method and the maximum deviation of the main lobe pattern is 0.25 dB. Related Articles | Metrics | Comments（0）

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Research on Online Validating Methods of Inertial Self-alignment Precision of Aerocrafts ZHANG Zhi-yong, ZHOU Jun, KONG Shang-ping, XIE Chen, LI Bao-yu, TONG Ze-you, LIANG Xue-chao, AN Ya-qing, SHA Chun-zhe Journal of Astronautic Metrology and Measurement    0, (): 52-56.   DOI: 10.12060/j.issn.1000-7202.2022.06.09 Abstract （61）      PDF（pc） （1243KB）（553）       Knowledge map    Save The traditional control method of aerocraft inertial self-alignment precision through examining electrical parameters is unreliable.To ensure the precision applicability of aerocraft inertial self-alignment executed before flight navigation,several online validating methods are analyzed and researched,including the conventional direct optical sighting method,the methods proposed innovatively of indirect optical sighting combined with transitive device,and the mathematic estimate correction method based on different calculating paths.The errors [JP3]effect process of direct optical sighting method is analyzed,and the new conceptions of validation methods are descripted.Meanwhile,the error elements and application specialties of these methods are sorted out.These methods’ feasibilities are verified by theoretical analyses and application practices. Related Articles | Metrics | Comments（0）

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Atom-based Vector Microwave Electrometry via Electromagnetic Induction Transparency and Autler-Townes Splitting in Cold Rydberg Atoms LIU Xiu-bin, JIA Feng-dong, ZHOU Fei, YU Yong-hong, ZHANG Jian, XIE Feng, ZHONG Zhi-ping Journal of Astronautic Metrology and Measurement    2023, 43 (3): 5-10.   DOI: 10.12060/j.issn.1000-7202.2023.03.02 Abstract （72）      PDF（pc） （1127KB）（546）       Knowledge map    Save Utilizing the advantages of low temperature of cold atoms, narrow spectral peaks of Rydberg Electromagnetic Induction Transparency (EIT), and clear atomic quantum states. The polarization of the microwave can be measured directly through spectral intervals in cold atomic samples based on Rydberg EIT and Autler-Townes (AT) splitting. The results show that the splitting interval of the Rydberg EIT-AT varies monotonously with the polarization of the microwave electric field and is proportional to the projection of the polarization of the microwave electric field on the polarization direction of the probe laser. The resolution is 3.2 °. Compared with the traditional method of using EIT resonance to detect the change of light transmittance in the hot atom vapor cell, the method based on cold atom EIT-AT splitting interval has the advantages of more direct, accurate and simple analysis. This work is of great significance to the absolute measurement of microwave polarization and the calibration of electric field strength. Related Articles | Metrics | Comments（0）

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Design of Self-test System for Batch-produced Spacecraft YANG Tong-zhi, DANG Jian-cheng, LIU Ting-yu, AN Tian-qi, WANG Ji-ye Journal of Astronautic Metrology and Measurement    2023, 43 (2): 76-82.   DOI: 10.12060/j.issn.1000-7202.2023.02.14 Abstract （78）      PDF（pc） （1425KB）（541）       Knowledge map    Save Rapid integrated test，regular rapid inspection after batch storage and rapid inspection before launch have become urgent production problems for batch-produced spacecraft.The traditional spacecraft integrated test mode has the problems of low test efficiency，cumbersome test modification and deployment，high test cost，long test cycle and difficult in-depth product internal exploration，which cannot well meet the needs of rapid development and test of batch-produced spacecraft.In view of the above problems，starting from the design of spacecraft testability and self-test，the design method of spacecraft self-test function unit，self-test communication interaction mode and self-test diagnosis model based on structural model and behavior model is studied，and the construction of layered spacecraft self-test system is designed.The self-test process is quickly scheduled through bus，which improve the rapid maintenance capability to meet the needs of rapid inspection of batch-produced spacecraft. Related Articles | Metrics | Comments（0）

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Application of Microservice Architecture in LIMS Design YANG Kun, LI Hua-chang, SHI Ye-hong Journal of Astronautic Metrology and Measurement    2022, 42 (6): 84-87.   DOI: 10.12060/j.issn.1000-7202.2022.06.15 Abstract （139）      PDF（pc） （923KB）（524）       Knowledge map    Save The microservice architecture reconstructs the enterprise-level service capability by splitting the system functions,and the problems of weak business isolation,high system coupling,high code maintenance cost and poor scalability existing in the traditional single application architecture is solved.The basic concepts,composition,advantages and implementation methods of microservice architecture is introduced,and the design and application scheme of microservice architecture in laboratory information management system is proposed.The laboratory information management system combined with the microservice architecture can effectively ensure the sustainability of enterprise business and improve enterprise management capabilities. Related Articles | Metrics | Comments（0）

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Exploration and Prospect of Smart Rocket Data Acquisition Technology#br# ZHANG Xia, YAN Ning, HAO Yu-xing, WANG Xiao-ding, XU Zhen-liang Journal of Astronautic Metrology and Measurement    2023, 43 (2): 64-70.   DOI: 10.12060/j.issn.1000-7202.2023.02.12 Abstract （102）      PDF（pc） （1124KB）（495）       Knowledge map    Save With the introduction of the concept of smart rocket，new challenges are posed to the data acquisition technology of launch vehicle.There are still problems in the launch vehicle，such as limited measurement field，low measurement accuracy and reliability，poor scalability and low tailorability.Based on the analysis of the current situation and problems of data acquisition summarizes the trend of data acquisition toward intelligence，networking，light weight and high efficiency is summarized.Combined with the trend research and judgment，the overall framework of data acquisition for a rocket is given，and the advantages，disadvantages and application scenarios of various key technologies such as structural health monitoring，fiber optic sensor network，and cable free are compared and analyzed.The application prospects of fiber grating sensor network，wireless sensor network，magnetic resonance wireless energy transmission and other technologies in smart rocket data acquisition are proposed. Related Articles | Metrics | Comments（0）

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Design and Calibration of Acoustic Sensor of Particle Impact Noise Detector BAI Tian, YAN Lei, TIAN Jun-hong Journal of Astronautic Metrology and Measurement    2022, 42 (6): 22-27.   DOI: 10.12060/j.issn.1000-7202.2022.06.04 Abstract （169）      PDF（pc） （950KB）（494）       Knowledge map    Save Working principle and signal characteristics of the particle impact noise detector were analyzed.According to the sensitivity index requirements of the key components of the acoustic sensor,a structural design method of the sensor’s sensitive element based on the resonance frequency analysis of piezoelectric ceramics was presented.According to the working characteristics of acoustic sensors,a sensitivity calibration method of face-to-face test was proposed to evaluate the performance parameters of acoustic sensors.The test results show that the calibration method is easy to operate,and the measurement uncertainty of 2.0 dB could be got,which could effectively verify the resonance frequency and sensitivity of the acoustic sensor,and provide a metrological guarantee for the reliability of the remainder detection. Related Articles | Metrics | Comments（0）

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Standard Pulse Signal Generation Method for Impulse Response Calibration of EMI Measurement Receiver LIU Shuang, MA Hong-mei, JIANG He, GONG Peng-wei, YANG Chun-tao, XIE Wen, CHEN Bei, YUAN Yan Journal of Astronautic Metrology and Measurement    2022, 42 (3): 7-13.   DOI: 10.12060/j.issn.1000-7202.2022.03.02 Abstract （96）      PDF（pc） （2486KB）（475）       Knowledge map    Save As a key instrument in electromagnetic compatibility testing,EMI measurement receiver has been used more and more widely.However,the standard source used for pulse response calibration of this kind of instrument completely depends on imports,and there is no substitute for the standard pulse signal generator in the domestic market.This article introduces a standard pulse signal parameter analysis method for impulse response calibration of EMI measurement receiver.First,we establish the parametric model of the standard pulse signal and perform numerical analysis and simulation to verify whether it meets the requirements of the standard CISPR 16-1-1.After that we build the experimental system,and develop the standard pulse signal generation software which controls the arbitrary pulse signal generator to output the standard pulse signal and compensates it,thus the standard pulse signal which meets the requirements of CISPR 16-1-1 is obtained.The signal can be used to calibrate the pulse response of EMI measuring receiver. Related Articles | Metrics | Comments（0）

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The Radar Target Detection based on Artificial Intelligence Technology WANG Lian, DONG Sheng-bo Journal of Astronautic Metrology and Measurement    2022, 42 (3): 75-79.   DOI: 10.12060/j.issn.1000-7202.2022.03.13 Abstract （127）      PDF（pc） （884KB）（467）       Knowledge map    Save The research on the target detection in heavy clutter is very hot in many countries,but the traditional radar target detection technology has shortage,can’t satisfy the complicated war,with the innovative technology of artificial intelligence on,because of the advantages of artificial intelligence in target recognition and feature extraction,the target detection in heavy clutter is practicable,the article accomplished the nonlinear prediction of sea clutter,by fitting the nonlinear dynamic of sea clutter based on the artificial intelligence technology,and provided a method of Pulse Doppler radar seeker small target detection in heavy sea clutter based on the neural network technology,and the ability of target detection in heavy sea clutter is developed by 2 dB to 6 dB. Related Articles | Metrics | Comments（0）

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Research on Pulse Voltage Testing and Calibration of Wide-bandgap Semiconductor Devices RAO Zhang-fei, QIN Kai-liang, XUE Dong, JIN Hong-xia Journal of Astronautic Metrology and Measurement    2022, 42 (6): 13-21.   DOI: 10.12060/j.issn.1000-7202.2022.06.03 Abstract （152）      PDF（pc） （1591KB）（458）       Knowledge map    Save In terms of the pulse test and calibration requirements of the third-generation wide-bandgap (WBG) semiconductor devices.Based on the research of double pulse test (DPT) method and principle of wide-bandgap semiconductor devices，The wide-bandgap semiconductor device test equipment technology status at domestic and foreign are analyzed.The precision calibration problem of 3 kV/50 μs pluse voltage are presented.The pulse high voltage calibration status and calibration method are researched.Through the mechanism analysis design and simulation of the resistive voltage divider，a precision voltage divider withstand voltage of 3 kV,rise time of 140 ns and amplitude linearity of 0.03% is developed.The self-developed pulse voltage divider is used to calibrate the pulse voltage of the semiconductor discrete device test equipment.The uncertainty of the calibration result is 0.5%，the needs of pulse high voltage calibration are satisfied. Related Articles | Metrics | Comments（0）

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Precision Measurement and Application of Quantum Interference Based on Compressed Light and Entangled Light ZHANG Yong-chao, ZHANG Tie-li, GAO Xiao-qiang, LIU Xiao-xu, XU Yong-yao Journal of Astronautic Metrology and Measurement    2023, 43 (6): 25-30.   DOI: 10.12060/j.issn.1000-7202.2023.06.05 Abstract （112）      PDF（pc） （3194KB）（443）       Knowledge map    Save Quantum precision measurement technology has shown broad application prospects in many fields due to its advantage of breaking through the standard quantum limit (SQL).The basic principles of quantum interferometry based on compressed and entangled light were introduced,mainly including the principles of Hong Ou Mandel (HOM) interferometry and Mach Zehnder (MZ) interferometry.This article summarizes the main application directions of quantum interferometry technology at present,including applications in the simultaneous measurement of small displacement and angle multiple parameters,gravitational wave measurement,gas concentration detection,and quantum imaging.It looks forward to the future development and application prospects of quantum precision measurement technology,and analyzes the current problems and future development trends. Related Articles | Metrics | Comments（0）

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Research on Infrared Image Detail Enhancement Algorithm and FPGA Implementation Method HE Suo-chun, ZHOU Yang, DANG Xue-chen, DONG Fei, LIU Yong Journal of Astronautic Metrology and Measurement    2022, 42 (6): 66-69.   DOI: 10.12060/j.issn.1000-7202.2022.06.11 Abstract （160）      PDF（pc） （1314KB）（442）       Knowledge map    Save Based on the traditional infrared enhancement method,a new weight-based infrared image details enhancement algorithm is proposed,which fully utilizes the histogram characteristics to enhance the contrast of infrared image while keeping the image details.In various complicated scenes with obvious temperature changes,the detail information can be guaranteed in the image while suppressing the background noise with this algorithm which has good enhancement and high real-time performance.After experimental verification,the target contrast is improved greatly,the target details is emerged effectively with this algorithm,and the signal-to-noise ratio is increased,which has good practicability. Related Articles | Metrics | Comments（0）

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Research Progress of High-precision Autonomous Navigation Based on Cold Atom XIE Hong-tai, KANG Ze-hao, HU Dong, WANG Yu Journal of Astronautic Metrology and Measurement    2023, 43 (6): 31-38.   DOI: 10.12060/j.issn.1000-7202.2023.06.06 Abstract （108）      PDF（pc） （3238KB）（434）       Knowledge map    Save All-weather,high anti-interference,and high concealment positioning,navigation and timing without exchanging information with the outside world can be achieved by autonomous navigation.Cold atom interferometry is with ultra-high sensitivity and stability due to its characteristics of matter wave and absolute measurement,and is expected to create an autonomous high-precision navigation system integrating inertial navigation,gravity and gravity gradient map matching aided navigation,and applied to long-term voyage carriers.Based on the configuration of atom interferometry,the research on cold atom sensors in recent decades over the world is summarized,and the technical schemes is analyzed,so as the selection of schemes suitable for the autonomous navigation is provided. Related Articles | Metrics | Comments（0）

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Design and Implementation of Semiconductor Minority Carrier Lifetime Measurement System based on High Frequency Photoconductivity Method ZHAO Zhao, GAO Zi-xing, LI Jie Journal of Astronautic Metrology and Measurement    2022, 42 (5): 38-43.   DOI: 10.12060/j.issn.1000-7202.2022.05.08 Abstract （101）      PDF（pc） （3273KB）（431）       Knowledge map    Save Based on the basic principle of minority carrier lifetime measurement of semiconductor by high frequency photoconductive attenuation method,a minority carrier lifetime measurement system is designed,and the signal processing system is improved on the basis of the diode detection circuit.Compared with the traditional diode detection circuit,the feedback principle of the operational amplifier eliminates the error caused by the voltage drop of the detector diode.At the same time,the effect of the voltage swing rate of the operational amplifier is reduced by the diode embedding effect,which further improves the detection ability of the measurement system.In addition,the feasibility of the detection circuit is verified by experiments,which effectively improves the accuracy of the measurement system. Related Articles | Metrics | Comments（0）

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Research on Verification Method of a Three-axis Turntable YANG Hai-yun, QIU Zhao-hui, SUN Jun, FAN Lei, QU Xin-yan Journal of Astronautic Metrology and Measurement    2022, 42 (6): 8-12.   DOI: 10.12060/j.issn.1000-7202.2022.06.02 Abstract （154）      PDF（pc） （872KB）（421）       Knowledge map    Save The three-axis turntable is one of the important equipment for testing inertial platforms and rate gyroscopes,and its metrology support  method has not been perfected in recent years.The measurement performance requirements and general technical requirements of a three-axis turntable have been analyzed,the verification items have been determined,the special standard equipment and special tooling have been configured,the standardized verification method was studied,quantity-value dissemination relationships were constructed，the measurement uncertainty of position error was evaluated as a case and the verification and result analysis were carried out,and the metrology support problem of a certain type of three-axis turntable was solved. Related Articles | Metrics | Comments（0）

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Design of Evaluation System for Performance of Wireless Sensor Network#br# LU Chao, WANG Kuo-chuan, ZHOU Ming-rui, XUE Kai-bing, XU Hui, SUN Fu-tao Journal of Astronautic Metrology and Measurement    2023, 43 (2): 71-75.   DOI: 10.12060/j.issn.1000-7202.2023.02.13 Abstract （106）      PDF（pc） （1546KB）（407）       Knowledge map    Save Aiming at the diversity of wireless sensor network performance evaluation indicators and the lack of unified standards,an overall evaluate system to assess the performance of wireless sensor network is designed.The system includes spectrum analysis subsystem,current acquisition subsystem and wireless sensor monitoring subsystem.The air spectrum,working current,network packet loss and throughout characteristics are acquired,counted and analyzed,and the performance evaluation of wireless sensor networks is realized. Related Articles | Metrics | Comments（0）

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Optical Hybrid Sensor Based on EFPI-FBG Structure LIU Dong-dong, WANG Wei, WANG Kun-peng, LIU Bin Journal of Astronautic Metrology and Measurement    2023, 43 (2): 51-57.   DOI: 10.12060/j.issn.1000-7202.2023.02.10 Abstract （96）      PDF（pc） （3861KB）（401）       Knowledge map    Save An EFPI-FBG fiber hybrid sensor based on an extrinsic Fabry-Perot interferometer (EFPI) and a fiber Bragg grating (FBG) structure is studied to measure pressure and temperature simultaneously.Fused silica is used as the pressure-sensitive material，and femtosecond laser welding technology is used to package the sensor head.The working principle of the sensor is analyzed，fabricated and tested in detail.The results show that the sensitivity of the sensor in the range of 0.8 MPa is about -0.729 μm/MPa，and the temperature sensitivity in the range of 50℃~200℃ is 0.009 nm/℃.The marimum permissible error of the sensor is±4.12%FS.The investigated EFPI-FBG hybrid sensor is expected to be applied in fields requiring pressure-temperature dual-parameter measurement. Related Articles | Metrics | Comments（0）

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Research on Coaxiality Calibration Technology of Tensile Testing Machine YU Ze-li, FANG Yong-qiang, YANG Jun-hong, ZHANG Bing, ZHANG Yi-xin Journal of Astronautic Metrology and Measurement    2022, 42 (4): 9-14.   DOI: 10.12060/j.issn.1000-7202.2022.04.02 Abstract （104）      PDF（pc） （931KB）（392）       Knowledge map    Save The affecting factors on the coaxiality measurement results were analyzed，including coaxiality bar material，test load，calibration method，assembly mode，loading rate，mechanical eccentricity，etc.The results indicated that among three measurement methods of coaxiality，the strain gage method was best，followed by extensometer method and geometric method.The influence sequence of each factor ranked as:mechanical eccentricity，assembly mode，coaxiality bar material，calibration method，loading rate.The coaxiality was increased with an increase in mechanical eccentricity，elastic modulus of coaxiality bar material and loading rate，while decreased with the rise of test load.The influencing order of assembly mode on coaxiality was the thread fixture，round bar fixture and the fixture with universal structure. Related Articles | Metrics | Comments（0）

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Design for Sinusoidal Dynamic Torque Sensor Calibration Device Based on Braking Excitation JIN Ran, ZHU Yong-xiao, ZHANG Wang, WU Quan, KUANG Xian-tao Journal of Astronautic Metrology and Measurement    2023, 43 (2): 7-13.   DOI: 10.12060/j.issn.1000-7202.2023.02.02 Abstract （101）      PDF（pc） （1793KB）（389）       Knowledge map    Save In order to solve the problem that static torque calibration cannot fully meet the use requirements at present,a sinusoidal dynamic torque sensor calibration device based on braking excitation is designed.In the system of the calibration device,the braking torque excitation part is composed of servo motor,magnetic particle brake and some connecting parts,the inertia disk is used as the load,and the angular acceleration of the inertia disk is measured with a circular grating.Through this calibration device,the dynamic torque is traced to the inertia and angular acceleration parameters.Through building simulation model and analysis,the principle of the device is explained.The developed calibration device prototype is used to carry out excitation test,and the test results show that the design scheme is feasible. Related Articles | Metrics | Comments（0）

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The Application of the Standing Wave Tube for Underwater Acoustic in Calibration of Vector Hydrophone CHEN Hong-juan, FEI Teng Journal of Astronautic Metrology and Measurement    2022, 42 (5): 1-7.   DOI: 10.12060/j.issn.1000-7202.2022.05.01 Abstract （143）      PDF（pc） （7710KB）（384）       Knowledge map    Save Application of underwater acoustic tube in low frequency underwater acoustic measurement is wide ranging,it can not only be used to calibrate low frequency underwater acoustic transducer,but also to measure acoustic parameters of underwater acoustic materials and their components.With the development of research on vector hydrophone,the measurement of particle velocity has been studied more and more in standing wave tube for underwater acoustic.Based on the review of the development history of vector hydrophone calibration technology and the current status of research,this paper analyzes the factors affecting the vector hydrophone calibration technology and presents the corresponding research results,at the same time,the corresponding research results are shown,including the high frequency distortion of sensitivity calibration results due to the positioning mode of reference acoustic pressure hydrophone and vector hydrophone under test,and the low frequency distortion of sensitivity calibration results due to the influence of vector hydrophone suspension structure when using comparative calibration method in the standing wave tube.In addition,the future development direction of vector hydrophone technology is prospected. Related Articles | Metrics | Comments（0）

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Research Progress on Quantum Hall Resistance of Low Magnetic Field WANG Zhong-wei, WANG Ning, CAI Jian-zhen, LI Shuang-yu, HUANG Xiao-ding Journal of Astronautic Metrology and Measurement    2023, 43 (2): 1-6.   DOI: 10.12060/j.issn.1000-7202.2023.02.01 Abstract （139）      PDF（pc） （1021KB）（376）       Knowledge map    Save The establishment of resistance standard based on Quantum Hall Effect (QHE) is a cutting-edge metrology technology,which is the highest standard to define the resistance in the world.The core component is Quantum Hall Resistance(QHR) which need 10 T in traditional GaAs QHR samples.The magnet will be difficult and expensive to made.With the development of QHR,it is urgent to find methods to develop QHR samples of low magnetic field.Three schemes for reproducing QHE under low magnetic field,including GaAs,graphene and ferromagnetic topological materials are introduced.The advantages and disadvantages of three schemes are analyzed from the dimensions of magnetic field,temperature,measurement uncertainty and technology maturity,to provide theoretical reference for the development of QHR in low magnetic field for China. Related Articles | Metrics | Comments（0）

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A Geometric Parameter Measurement Method of Aerospace Engine Assembly Process Based on Photogrammetry Technology WANG Jing-long, QIANG Wei, PAN Zhao-yi, ZHANG Quan-ming, TONG Jia-wei Journal of Astronautic Metrology and Measurement    2023, 43 (2): 36-41.   DOI: 10.12060/j.issn.1000-7202.2023.02.07 Abstract （98）      PDF（pc） （2152KB）（373）       Knowledge map    Save At present,the measurement method of geometric parameters in the assembly process of aerospace engines in China is that professionals operate Laser Tracker System or Electronic Total System to measure point by point,which has the disadvantage of low measurement efficiency.An efficient measurement method of geometric parameters of aerospace engine assembly process based on photogrammetry technology is proposed.The measurement principle of this measurement method is introduced,and then the measurement objectives of each measurement link of this method are explained in detail.Finally,the system accuracy of industrial digital photogrammetry technology in such applications is calculated through measured data,which proves the feasibility of this measurement method. Related Articles | Metrics | Comments（0）

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Development Trend of High Performance Passive CPT Atomic Clock  DING Chen-feng, CHEN Hai-jun Journal of Astronautic Metrology and Measurement    2023, 43 (5): 23-30.   DOI: 10.12060/j.issn.1000-7202.2023.05.03 Abstract （98）      PDF（pc） （1126KB）（364）       Knowledge map    Save The use of a single circularly polarized light configuration to achieve a CPT state will generate a polarized dark state,resulting in a lower contrast of the CPT signal.Therefore,the frequency stability index of traditional CPT atomic clocks is not high.In order to improve the contrast of CPT signals and improve the performance of CPT atomic clocks,various schemes for eliminating polarized dark states have been proposed and studied.These schemes can be divided into parallel line polarized light configurations and phase delayed configurations based on the polarization state and generation method of the laser used σ+-σ- Configuration,push-pull pump configuration,vertically polarized light configuration,polarization modulation configuration.Based on the principles and development level of these schemes,a comparative analysis of their advantages,disadvantages,and improvement plans can be conducted to explore new development directions for high-performance atomic clocks under different demand conditions. Related Articles | Metrics | Comments（0）

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Discussion on Replacing Standard Mercury Thermometer with High Precision Digital Thermometer WANG Zai-qi, CHEN Jiong-yu, JI Jin-long, LIU Jun-jian Journal of Astronautic Metrology and Measurement    2022, 42 (3): 44-48.   DOI: 10.12060/j.issn.1000-7202.2022.03.08 Abstract （57）      PDF（pc） （1040KB）（363）       Knowledge map    Save Replacing standard mercury thermometers with high-precision digital thermometers based on industrial platinum resistors is a research hotspot in the field of thermometry.However,so far,such products can only be used as working instruments,the main reason is that the long-term stability of high-precision digital thermometers has not been studied sufficiently.The results of an eight year study on the stability of a high precision digital thermometer is introduced, and compares it with the standard mercury thermometer,shows that it is completely feasible to replace the standard mercury thermometer with a high-precision digital thermometer,and puts forward some specific suggestions. Related Articles | Metrics | Comments（0）

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Research on Influence of Temperature and Pressure in SMD Pressure Transducer Temperature Characteristics Calibration Device GAO Bing-tao, Liu Yi, DONG A-bin, HUO Rui-dong, TIAN Jun-hong, ZHONG Shan Journal of Astronautic Metrology and Measurement    2022, 42 (6): 1-7.   DOI: 10.12060/j.issn.1000-7202.2022.06.01 Abstract （131）      PDF（pc） （4879KB）（362）       Knowledge map    Save The temperature and pressure parameter simulation analysis and experimental research on the SMD pressure transducer temperature characteristics calibration device have been carried out.The results show that under the absolute pressure of 2 kPa and 500 kPa pressure points,the temperature distribution of the calibration chamber and pressure pipeline of the chip pressure sensor in the temperature range of -50 ℃~100 ℃ meets the requirements for use.The temperature isolation is achieved between the standard pressure source and the high and low temperature calibration chamber.The accuracy of the standard pressure value is ensured when calibrating the temperature response characteristics of the SMD pressure sensor. Related Articles | Metrics | Comments（0）

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Thermometry based on Nitrogen-vacancy Centers in Diamonds DONG Xian-qi, LIU Yan, YANG Ren-fu Journal of Astronautic Metrology and Measurement    2023, 43 (3): 56-60.   DOI: 10.12060/j.issn.1000-7202.2023.03.11 Abstract （68）      PDF（pc） （1210KB）（362）       Knowledge map    Save In recent years, the rapid development of quantum information science has promoted the research of various quantum sensing technologies and produced many important results, which has had an important impact in the field of precision measurement. The sensing technology based on solid-state diamond NV color center electronic spin detection can be traced back to the basic quantum physical principles, and has important research value in the measurement standards of various sensing fields such as magnetic field, electric field, temperature, and pressure. The excellent properties of diamond NV color centers make reliable, stable and high-precision sensing applications possible in harsh environments. Taking its application in the field of temperature measurement as an example, this paper focuses on the development of NV color center spin detection principles and methods in the past ten years, and discusses the important research significance of solid-state quantum temperature measurement in combination with the latest research results. Related Articles | Metrics | Comments（0）

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Research Progress on Calibration Technology of Single Photon Detectors LIU Chang-ming, ZHANG Peng-ju, LIN Yong-jie, SHEN Rong-ren, LIU Hong-bo, SHI Xue-shun, ZHUANG Xin-gang, WU Bin Journal of Astronautic Metrology and Measurement    2023, 43 (3): 34-39.   DOI: 10.12060/j.issn.1000-7202.2023.03.07 Abstract （81）      PDF（pc） （1028KB）（358）       Knowledge map    Save With the rapid development of quantum information technology,single photon detectors,as core devices in fields such as quantum secure communication,have been one of the research hotspots.In recent years,the performance of single photon detectors has greatly improved with the development of various new technologies.At the same time,the research on testing and calibration techniques of single photon detectors has also received attention,especially the new calibration technology based on quantum physical effects,which have received attention from various metrological institutions.A brief introduction is given to the working mechanism of single photon detectors and the research progress of calibration technology of single photon detectors at home and abroad.The current status of detection efficiency calibration based on standard detectors and correlated photon pairs,as well as calibration technology for after-pulse probability and time jitter,is summarized.This can provide reference for researchers in related fields and put forward prospects for the future development of technology. Related Articles | Metrics | Comments（0）

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Global Navigation Satellite Systems (GNSS)Active Antenna Noise Temperature Measuring Device CAOYue, HU Yu, YANG Han-xu, ZHANG Jin-ling, ZHAI Hong Journal of Astronautic Metrology and Measurement    2022, 42 (5): 29-33.   DOI: 10.12060/j.issn.1000-7202.2022.05.06 Abstract （266）      PDF（pc） （2356KB）（339）       Knowledge map    Save The noise temperature of satellite navigation active receiving antenna is one of the key technical indexes of navigation receiver.In order to solve the problem that the overall noise temperature of the satellite navigation active antenna cannot be measured,two surface type noise sources are developed.The surface type noise source is mainly composed of radiator,radiator physical temperature control and temperature measurement instrument.The two surface type noise sources provide the high and low standard noise temperature in L band and S band.The noise temperature of active receiving antenna is measured by Y-Factor method.The noise temperature of a satellite navigation active antenna is measured.In the frequency range of (1.19~1.29) GHz,the noise temperature measurement result is 206 K at the center frequency of 1.24 GHz.However,the noise temperature measurement result is greater than 4 000 K at the frequency of 1.266 GHz,which indicates that there are design problems or other problems between the antenna and the filter,and between the filter and the amplifier,reflecting the necessity of measuring the noise temperature of the active antenna. Related Articles | Metrics | Comments（0）

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UAV Deployment Algorithm in UAV-aided VANET XIE Ying-hui, PENG Wei-jie, SU Xiu-zhi, QIU Chun-rong, YANG Hong-zhao Journal of Astronautic Metrology and Measurement    2022, 42 (3): 80-85.   DOI: 10.12060/j.issn.1000-7202.2022.03.14 Abstract （83）      PDF（pc） （1197KB）（336）       Knowledge map    Save Aiming at deployment problem of Unmanned Aerial Vehicle(UAV) in UAV-assisted Vehicle-to-everything(V2X),energy-efficient deployment of UAV considering latency and backhaul is analyzed in this paper.To minimize the total power consumption is the goal of deployment mechanism considering the latency in the V2X network and backhaul link problem.First,we derive the latency constraint as an individual data rate constraint for V2X network and backhaul link capacity as a function of distance between UAV and the ground base station.The objective function is constructed based on delay and backhaul link capacity.Finally,the objective function is solved by sequential quadratic programming(SQP).In the numerical results,it is stated that communication packet size is an essential parameter.It is also observed that as the delay constraint tightens and the average packet size increases,the sum of the data rates of vehicle users converges to the backhaul link capacity. Related Articles | Metrics | Comments（0）

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Non-magnetic Thermostat Control System for Cesium Optical-pumping Magnetometer XIE Yin, CHENG Zhi-yong, LI Xiao-fang, WANG Ling, ZHANG Fan Journal of Astronautic Metrology and Measurement    2022, 42 (5): 69-72.   DOI: 10.12060/j.issn.1000-7202.2022.05.13 Abstract （109）      PDF（pc） （1384KB）（335）       Knowledge map    Save Aiming at the requirement of high temperature stability and non-magnetic interference in the atomic gas cell of the cesium optical-pumping magnetometer,a non-magnetic thermostat control system for the cesium optical-pumping magnetometer is designed.The system mainly includes a non-magnetic heating chip and a non-magnetic thermostat control circuit.The non-magnetic heating chip adopts the double-layer symmetrical four-wire structure of MEMS technology,which can effectively suppress the magnetic field generated by the current;The non-magnetic thermostat control circuit uses AC heating to further reduce the constant magnetic field interference.With the field programmable gate array as the core,the direct digital frequency synthesis technology is used to generate high-frequency heating signals,and then the non-magnetic thermostat control is performed through power amplification to reduce the circuit hardware resource.The test results show that the temperature control stability of the gas cell can reach 0.02 ℃,which meets the performance requirements of the optical-pumping magnetometer. Related Articles | Metrics | Comments（0）

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Method for Analyzing Uncertainty of High Precision Ultrasonic Flowmeter for Main Feedwater LIU Yan, WEI Hua-tong, BAI Tian, WANG Feng-ning, REN Da-cheng, LIU Li, CUI Xi-wei, GUO Lin Journal of Astronautic Metrology and Measurement    2023, 43 (4): 1-7.   DOI: 10.12060/j.issn.1000-7202.2023.04.01 Abstract （101）      PDF（pc） （994KB）（330）       Knowledge map    Save The methodology of high-precision measurement of main feedwater flow is proposed based on Hualong No.1 and other nuclear power plants(NPP) to achieve measurement uncertainty recapture power uprates(MUR).The components of uncertainty measured by ultrasonic flowmeter such as calibration coefficient and medium density are quantified.Under the conditions with defining the structure and measurement principle of ultrasonic flowmeter and the complex operating conditions of high pressure and high temperature(HPHT),the uncertainty evaluation methodology of channel geometric factor and pipe cross-sectional area has been given respectively.By analyzing the influence of the operating conditions on the flow measurement,the uncertainty introduced by the flow field velocity has been evaluated.The analysis results indicate that the metrological traceability method which based on the combination of several uncertainty evaluation methods is feasible. Related Articles | Metrics | Comments（0）