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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 （196）      PDF（pc） （4579KB）（2637）       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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Research on Development Status of Pulse Current Shunts CUI Shao-ying；WANG Shu-qiang；MA Zhi-yi JOURNAL OF ASTRONAUTIC METROLOGY AND MEASUREMENT    2016, 36 (6): 82-88.   DOI: 10.12060/j.issn.1000-7202.2016.36.6.82 Abstract （434）      PDF（pc） （1364KB）（2305）       Knowledge map    Save Accurate and reliable measurement of pulse current has great scientific value and wide applications. In the pulse current measurement system, pulse current shunts are the common devices for signal conversion. Based on the principle of shunts, the status of the pulse current shunts was investigated. The structures of the pulse shunts were focused. The pulse shunts were classified, and furthermore, the measurement range, accuracy and other characteristics of shunts with different structure and material were summarized. The research provides reference to the development direction and the promotion of measurement accuracy of the pulse current shunts. Reference | Related Articles | Metrics | Comments（0）

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The Compensation Method for the Effect of the Reference Point′s Jitter in Non-contact Displacement Measurement   LU Song；LI Tao；LIN Zhi-jun；CAI Ping；JI Xiao-jun JOURNAL OF ASTRONAUTIC METROLOGY AND MEASUREMENT    2016, 36 (6): 13-19.   DOI: 10.12060/j.issn.1000-7202.2016.36.6.13 Abstract （412）      PDF（pc） （439KB）（2170）       Knowledge map    Save During threedimensional vibration displacement measurement based on optical devices, the reference point of the optical measurement system must remain stationary. It is difficult to satisfy this condition in field tests. To solve this problem, a compensation method was presented to amend the influence of small vibrations of the reference point. The displacement of the reference point can be obtained from its acceleration signal at first, and the correction matrixes for target displacement are derived for compensating the measurement errors caused by the shaking of the reference point. The data processing algorithm to convert acceleration signal to displacement signal is presented, and the effectiveness of this algorithm is verified by simulation of composite sinusoidal signals and damped decaying vibration signals with random white noise. The theory and calculation procedure for correction matrixes derived from displacement of the reference point are comprehensively discussed. The experimental measurement system was built using two sets of NDI Optotrak Certus System and one 3D capacitive accelerometer, which is used to verify the theory and method proposed in the paper. Measurement results with data processing show that this method can effectively compensate and correct the measurement errors due to vibrations of the reference point, thus improved measurement accuracy is expected.   Reference | Related Articles | Metrics | Comments（0）

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Measurement Technique of Motion Attitude to Vekicle Based on Stereovision and Its Application WEN Ju-ying；LU Ying；LIANG Ya-jun；ZHANG Qi；CHEN Shi-li JOURNAL OF ASTRONAUTIC METROLOGY AND MEASUREMENT    2013, 33 (2): 12-15.   DOI: 10.12060/j.issn.1000-7202.2013.02.03 Abstract （300）      PDF（pc） （2826KB）（2168）       Knowledge map    Save Aiming at the demand of spacecraft ground test, the basic principle of measurement technique based on stereovision is put forward and its system is built. The experiment results is presented that the proposed method had high accurately, and position and posture of the aerocraft are acquired. Accuracy of the navigation and control system was assessed, which ensure the accomplishment of experiment.  Related Articles | Metrics | Comments（0）

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Research on Auto Home Control Method of  Incremented MultiReference Mark Encoder MAI Ji；HU Rui；CHEN Shan-zhi；WANG Yu-feng；ZHANG Xin-lei JOURNAL OF ASTRONAUTIC METROLOGY AND MEASUREMENT    2016, 36 (6): 25-28.   DOI: 10.12060/j.issn.1000-7202.2016.36.6.25 Abstract （430）      PDF（pc） （2111KB）（2076）       Knowledge map    Save The multi-reference mark encoder is used widely in metrology measurement and autocontrol as angle measuring device.The principle and coding mode of multi-reference mark encoder were introduced with an encoder of HEIDENHAIN company as on example. A research on a new auto home control method was taken based on the characteristics of multi-reference marks encoder. This method was used to collect and analyze the test data for a certain rotary table.The control method was proved reliably and accurately in test. Reference | Related Articles | Metrics | Comments（0）

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Thermal Design and Analysis for Missile borne Infrared Thermograph CHANG Hong；LIU Yong；WEI Xiao-lin；LIN Sen JOURNAL OF ASTRONAUTIC METROLOGY AND MEASUREMENT    2016, 36 (6): 5-8.   DOI: 10.12060/j.issn.1000-7202.2016.36.6.5 Abstract （631）      PDF（pc） （299KB）（1832）       Knowledge map    Save Be restricted within the narrow space, missileborne infrared thermograph integrates the electrical，optical and mechanical components in limited space． The imaging quality of thermograph and detector capability will be affected by the heat dissipation of internal components and the external heat flux conducted by mechanical parts． Thermal design is needed to guarantee its normal work and high imaging quality in outer space． In this paper thermal design was taken according to the thermal environment and the structure characteristic of the thermograph. Passive control methods were used to extend the thermal time constant. The heat transfer model was built, and the simulation was taken based on the thermal control methods and the work condition. The analysis results showed that the temperature of thermograph was between 10℃~60℃, which met the thermal control index. Through the analysis, a warrant for reliability of thermograph and optimization of thermal design was provided. Reference | Related Articles | Metrics | Comments（0）

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A Design of Automatic Explosive Tester JOURNAL OF ASTRONAUTIC METROLOGY AND MEASUREMENT    2016, 36 (6): 77-81.   DOI: 10.12060/j.issn.1000-7202.2016.36.6.77 Abstract （327）      PDF（pc） （391KB）（1828）       Knowledge map    Save A kind of automatic explosive tester used in aerosystem was designed. The main function, technical index, test principle and system composing of the tester was introduced. The resistance test and insulation test of the explosive device were carried out by the tester. The realtime test data was compared with the corresponding data in the eligible certificate, and the data was judged whether it is eligible or not. The last register was stored in the USB flash disc. The testtime registering function and failure informing function were provided in the tester. Through debugging and testing, the tester runs reliably and stably in a long time, and the user′s requirement was completely satisfied. Reference | Related Articles | Metrics | Comments（0）

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Application of Improved Wavelet Threshold De-noising Method in Pipeline Leakage Detection CHEN Cheng-bo；SHI Ming-jiang；LI Wei JOURNAL OF ASTRONAUTIC METROLOGY AND MEASUREMENT    2015, 35 (6): 48-52.   DOI: 10.12060/j.issn.1000-7202.2015.06.11 Abstract （161）      PDF（pc） （3121KB）（1754）       Knowledge map    Save Negative pressure wave signal denoising is one of the core issues to be solved in pipeline leakage detection method based on negative pressure wave. A comparison among traditional hard and soft threshold function, hyperbolic and exponential algorithm and improved algorithm has been made on the basis of analyzing wavelet transform theory and wavelet threshold denoising. The results of experiment show that improved algorithm used in pipeline leakage detection processing could obtain a larger SNR (signal to noise ratio) and a good denoising ability for negative pressure wave signal, which could effectively improve leakage detection accuracy. Related Articles | Metrics | Comments（0）

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Research on Positioning Control Technology of Stepping Motor Based on AVR MCU YANG Ying-hui JOURNAL OF ASTRONAUTIC METROLOGY AND MEASUREMENT    2016, 36 (6): 89-95.   DOI: 10.12060/j.issn.1000-7202.2016.36.6.89 Abstract （416）      PDF（pc） （4145KB）（1716）       Knowledge map    Save A stepper motor control system based on AVR microcontrollers was introduced, which can realize the control of acceleration, deceleration and deceleration of the stepper motor. It can also realize the control of the running time when the precise positioning operation was realized. The position measurement error was measured and the traditional openloop position control method was changed to improve the position control precision. Reference | 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）（1648）       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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Research of the Narrowband Interference Suppression algorithm for DSSS systems based on FFT LIN Ming;HU Zhu-li;YANG Jian-wei JOURNAL OF ASTRONAUTIC METROLOGY AND MEASUREMENT    2012, 32 (6): 52-56.   DOI: 10.12060/j.issn.1000-7202.2012.06.13 Abstract （280）      PDF（pc） （3387KB）（1593）       Knowledge map    Save To overcome the narrowband interference (NBI) in the direct sequence spread spectrum (DSSS) system, an antijam algorithm based on Fast Fourier Transform (FFT) is introduced. The narrowband interference is detected and suppressed by FFT based on its power distribution different from the DSSS signal in frequency domain. And the synthesizable algorithm is implemented by Verilog HDL to achieve in the FPGA. Simulation and hardware test show that anti-jam block can suppress NBI and get back the original signal. Related Articles | Metrics | Comments（0）

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A GPS-Rubidium Clock Synchronization System based on FPGA and TDC YANG Jun;CHEN Zhi-yong;YU Fang;TANG Chao;SHENG Rong-wu JOURNAL OF ASTRONAUTIC METROLOGY AND MEASUREMENT    2012, 32 (1): 30-33.   DOI: 10.12060/j.issn.1000-7202.2012.01.08 Abstract （373）      PDF（pc） （2686KB）（1586）       Knowledge map    Save In this paper, a high-precision time and frequency synchronization system is proposed, which works with GPS and GPS-disciplined rubidium clock. The system outputs a standard 10MHz frequency and a high-precision 1PPS time signal. With the tameness of GPS, the synchronization accuracy of the system can be reached 7.2 ns, and the accuracy of the standard 10MHz can be better than 1E-12. Analysis of the principle and the implementation of the system are presented in detail, and test data is given. The result demonstrates that the indicators of the system meet the engineering requirements. Related Articles | Metrics | Comments（0）

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The Research of PD Controll Method Based on the Tracking Differentiator for Course of a Target Ship LI Shuang-ming；PAN Yu-chun JOURNAL OF ASTRONAUTIC METROLOGY AND MEASUREMENT    2016, 36 (6): 66-69.   DOI: 10.12060/j.issn.1000-7202.2016.36.6.66 Abstract （289）      PDF（pc） （2073KB）（1549）       Knowledge map    Save In order to solve the overshoot of the target ship′s course under the PD controller and noise disturbance to sensors used in the sea, a PD controller for the target ship′s course based on the tracking differentiator was proposed. The kinematics model of the target ship was established. The disturbance torque model of wind and Ocean current were buitt. The principle of tracking differentiator was elaborated, and the PD controller based on tracking differentiator was designed. Adding Gauss white noise to the measurement of course signal, simulations were carried out for PD controller and TD controller respectively. Reference | Related Articles | Metrics | Comments（0）

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A Relative Spectral Responsibility Auto-Testing System of Infrared Focal Plane Array JIANG Bin； YING Cheng-ping； LIU Hong-yuan； WANG Hong-chao JOURNAL OF ASTRONAUTIC METROLOGY AND MEASUREMENT    2016, 36 (6): 40-44.   DOI: 10.12060/j.issn.1000-7202.2016.36.6.40 Abstract （212）      PDF（pc） （4194KB）（1539）       Knowledge map    Save It is necessary to measure the spectral responsibility of every single wavelength manually when measuring the relative spectral responsibility of infrared focal plane array. But the process is very complex and timeconsuming. Based on the different platforms, a relative spectral responsibility autotesting system of infrared focal place array was researched by dynamic linking library technology. It will reduce the complicated operation and meet the needs of various device measurement. Reference | Related Articles | Metrics | Comments（0）

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Subdivision Design of Grating Moire Fringes and Simulation by Simulink YANG Hua-hui；FENG Wei-li；LIU Fu JOURNAL OF ASTRONAUTIC METROLOGY AND MEASUREMENT    2016, 36 (6): 29-34.   DOI: 10.12060/j.issn.1000-7202.2016.36.6.29 Abstract （479）      PDF（pc） （348KB）（1530）       Knowledge map    Save According to the high precision subdivision requirements of metrological grating Moiré fringes, a subdivision method of grating based on ADC amplitude sampling and phase resolution was established. And the simulation model of this subdivision method was established to convert the sin & cosine signals into two quadrature encoding signals after positive cotangent transforming, the amplitude sampling phase dividing in fixed step size and other processing method. The results of simulation experiments show that the interpolation of this method is related to accuracy of ADC with the ideal signal inputting and the maximal interpolation can be increased up to 1000 by improving the ADC sampling digit. The simulation experiment also verified that subdivision precision mainly depends on the signal quality by adding noise interference including unequal amplitude error, quadrature phase shift error and high order harmonic components to the dynamic sin & cosine ideal signals. Reference | Related Articles | Metrics | Comments（0）

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The Research of the on-site Calibration Method to High Pressure Gas WANG Ping；XIAN Bao-jin；DU Guang-yu；HUANG qi-gang；JIAO Xiin-xin JOURNAL OF ASTRONAUTIC METROLOGY AND MEASUREMENT    2016, 36 (6): 61-65.   DOI: 10.12060/j.issn.1000-7202.2016.36.6.61 Abstract （265）      PDF（pc） （3020KB）（1507）       Knowledge map    Save According to the requirements of the high pressure gas equipment′s on-site Calibration, the method of the high pressure gas on-site Calibration is introduced. The investigation of the high pressure gas on-site Calibration technology is introduced, including the technology demand of the standard  equipments, environment, items of calibration, and the choice of calibration points. Using the method, the pressure equipments can be calibrated in its measurement rang without disassembly. It will be convenient to the pressure equipment′s calibration. At last, the uncertainty of the on-site high pressure gas equipments′s calibration was analyzed.  Reference | Related Articles | Metrics | Comments（0）

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Research on Real-time Estimation Mathod for Range and Cruise Duration of UAV CONG Shu-quan;WANG Cheng-jun;JIANG yang JOURNAL OF ASTRONAUTIC METROLOGY AND MEASUREMENT    2012, 32 (2): 62-65.   DOI: 10.12060/j.issn.1000-7202.2012.02.17 Abstract （327）      PDF（pc） （2577KB）（1486）       Knowledge map    Save The range and cruise duration of UAV are the key tactical and technical characteristics to identify successful mission.That affectted the range and cruise duration are so many when UAV flying.According to the aerodynamics principle and the kinematics principle,real-time estimation method and application of the range and cruise duration of UAV are explored. Related Articles | Metrics | Comments（0）

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Research on Video Observation System of Anti-ship Missile and Target Encounter Based on Seaborne Buoy DING Li-jun； XU Yi-qun；CONG Shu-quan JOURNAL OF ASTRONAUTIC METROLOGY AND MEASUREMENT    2016, 36 (6): 9-12.   DOI: 10.12060/j.issn.1000-7202.2016.36.6.9 Abstract （255）      PDF（pc） （205KB）（1465）       Knowledge map    Save According to the problems in area of video observation of antiship missile and target encounter, a kind of video observation system of missile and target encounter is put forward. The general scheme was designed, and the operating mode was depicted. The observation capability of the system was analyzed, and the key technologies were studyed.  Reference | Related Articles | Metrics | Comments（0）

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Research Progress of Microwave Electric Field Measurement Technology based on Coherent Effect of Rydberg Atoms JIN Gang, CHENG Yong-jie, CHENG Xian-you, WANG Shuo, HUANG Cheng-zu, CHEN Xing, LIU Xing-xun, QI Wan-quan Journal of Astronautic Metrology and Measurement    2022, 42 (1): 1-10.   DOI: 10.12060/j.issn.1000-7202.2022.01.01 Abstract （272）      PDF（pc） （5717KB）（1460）       Knowledge map    Save In recent years,microwave measurement techniques based on Rydberg atom have been developed rapidly and widely used.The technology of detecting microwave based on coherent effect of Rydberg atom is novel that can directly correlate microwave field strength with frequency measurements via fundamental physical constants,with high sensitivity,large dynamic range,and low measurement uncertainty,it is expected to be the next generation of microwave electric field reference that can be traced directly to the International System of Units(SI).In this paper,the principle and development of microwave measurement based on the coherent effect of Rydberg atom are introduced in detail,the research progress at home and abroad is discussed in three aspects,including high accurate measurement，high sensitivity and microwave polarization direction measurement.In final,the applied research in engineering system has been discussed in three aspects,including the technology of addressing the broadband Rydberg states,the simulation analysis versus experiment test of vapor in microwave electric field and design of fiber-coupled vapor. Related Articles | Metrics | Comments（0）

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The Measuring Technique for Spatial Virtual Axis ZHANG Zhi-yong；LIU Li-hui；ZHAO Tian-cheng；GAO Li-qin；ZHOU Jun；WANG Zhan-tao JOURNAL OF ASTRONAUTIC METROLOGY AND MEASUREMENT    2016, 36 (6): 1-4.   DOI: 10.12060/j.issn.1000-7202.2016.36.6.1 Abstract （302）      PDF（pc） （2088KB）（1459）       Knowledge map    Save Because the spatial virtual axis does not exist as a direct substantiality, the traditional technique of contact measurement can not be adopted for it. Therefore, the research on the measurement instance of virtual boresight of satelliteborne camera was carried out by using normal instrument to derive it according to its optical characteristics. Every object for transfering attitude relations was modeled based on measurable data. According to the internal relevance between every object, the precise formula of spatial virtual axis is deduced. Because of the considerate design for the existing conditions, the technique can be applied to the engineering practices. Reference | Related Articles | Metrics | Comments（0）

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Research on the In-Situ Thrust Calibration Techniques of  Aero-engine Test Bed Based on a Novel Hydraulic Force Source ZHU Xi-ge; WANG Xiao-san JOURNAL OF ASTRONAUTIC METROLOGY AND MEASUREMENT    2016, 36 (6): 45-49.   DOI: 10.12060/j.issn.1000-7202.2016.36.6.45 Abstract （300）      PDF（pc） （2411KB）（1446）       Knowledge map    Save A novel hydraulic force source is introduced in this paper with the main features of high accuracy, refined dividing of differential flow, adaptation to the motor′s speed characteristics and constant leakage. The application of this hydraulic force source on in-situ calibration of the aero-engine test bed was carried out, and the result was compared with that from the calibration in the laboratory. Finally, some applicable conclusions were summarized on the thrust calibration of the aero engine test bed.   Reference | Related Articles | Metrics | Comments（0）

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Research on the Application of Virtual Digital Process Equipment Measuring Platform Based on Large Scale Manufacture WANG Zhi-hua；ZHOU Xiao-qing；LIU Ying JOURNAL OF ASTRONAUTIC METROLOGY AND MEASUREMENT    2016, 36 (6): 20-24.   DOI: 10.12060/j.issn.1000-7202.2016.36.6.20 Abstract （245）      PDF（pc） （3585KB）（1424）       Knowledge map    Save Difficulties of a largescale special parts in the manufacturing process were analyzed. The design principle of virtual digital Process Equipment measuring platform was discussed, which based on the laser tracking digital measuring and positioning technology. Combined with an example, the application of measuring platform in the manufacturing process of largescale special parts was explained in detail, and the coordinate array control method was adopted to solve the difficulties in manufacturing process. By the verification in practice, the measuring platform can effectively assist the manufacture of largescale special parts and effectively control the quality Reference | Related Articles | Metrics | Comments（0）

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A Design of the High-precision LVDT Sensor with Large Measuring Range Ratio LIU Shu-xuan； LI Wen-zhang；REN Hai-yan；YU Fei JOURNAL OF ASTRONAUTIC METROLOGY AND MEASUREMENT    2016, 36 (6): 35-39.   DOI: 10.12060/j.issn.1000-7202.2016.36.6.35 Abstract （378）      PDF（pc） （2934KB）（1407）       Knowledge map    Save In order to meet the largerange requirements of the feedback measuring units in a feedback system within a limited mounting space, a highprecision linear variable differential transformer(LVDT)sensor with large measuring range ratio was designed. The principle and structure of the LVDT sensor were illustrated and the coil winding method of the existing LVDT sensor which was systematically analyzed. And then, a new method of coil winding was proposed. Compared with the conventional LVDT sensor, this method had a greater measuring range without increasing the geometric size, which enables the effective measuring length to be 70% of the measuring rod. Finally, the test proved that this new product satisfized the measurement of large measuring range ratio with the linearity as high as 0.6%.  Reference | Related Articles | Metrics | Comments（0）

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Design of Automatic Evaluation of Measurement Uncertainty for Indication Error of the Digital Multimeter YAN Hong-yan;WU Hua JOURNAL OF ASTRONAUTIC METROLOGY AND MEASUREMENT    2012, 32 (6): 80-87.   DOI: 10.12060/j.issn.1000-7202.2012.06.19 Abstract （170）      PDF（pc） （3387KB）（1384）       Knowledge map    Save According to the fact that the digital multimeter was detected have problems like various types, multipex calibration items and after the calibration, the uncertainty of the evaluation results should be given within the whole test range. Manual uncertainty evaluation was proved to be time-consuming, laborious, inefficient and prone to errors. Based on the VEE Pro software-exploiting platform, the system of automatic evaluation of uncertainty of measurement result of indication error of digital multimeter was developed. The system contains two moulds, the evaluation of uncertainty of digital multimeter with interface and the evaluation of uncertainty of digital multimeter without interface. Besides, the system could be automatically evaluated and saved the uncertainty data. And the uncertainty evaluation results of the indication error of dc voltage with examples could be showed up. The results show that the system is easy to operate; it can improve the working efficiency, reduce the man-made error and ensure the accuracy of test data. Related Articles | Metrics | Comments（0）

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Restraining o f Instantaneous Velocity Fluctuation on the Turntable WANG Yu-feng, ZHANG Xin-lei, FAN Xiao-dong, ZHANG Gong Journal of Astronautic Metrology and Measurement    2016, 36 (6): 70-73.   DOI: 10.12060/j.issn.1000-7202.2016.36.6.70 Abstract （319）      PDF（pc） （355KB）（1379）       Knowledge map    Save The porrameter of rate is very important to evaluate the rate turntable and other inertial navigation test devices with rate function. In view of the inertial testing equipment, the rate test method can't reflect the instantaneous angular rate in the operation of turntable.Based on the analysis of the turn­ table rate fluctuation, butterworth low-pass filter was used in the turntable rate ring. The effectiveness of the filter was demonstrated through MATLAB simulation analysis and table velocity curve drawing. Reference | Related Articles | Metrics | Comments（0）

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Design of A Cable Assembly with N-Style RF Connector CAI Xiao-tao；YU De-jiang；WANG Hui-feng；QU Xiao-song；ZHANG Li-ming JOURNAL OF ASTRONAUTIC METROLOGY AND MEASUREMENT    2013, 33 (5): 23-26.   DOI: 10.12060/j.issn.1000-7202.2013.05.05 Abstract （197）      PDF（pc） （2923KB）（1350）       Knowledge map    Save This paper presents a cable assembly with N-style RF (radio frequency) coaxial connector. By adopting the method of coplanar-offset, the measured VSWR of the proposed cable assembly is less than 1.13 within the operation frequency band (0.01~18)GHz. The VSWR performance of the proposed cable assembly with designed Nstyle RF connector is better than the VSWR of this kind of familiar cable assemblies. The simulated and measured results of the proposed cable assembly are in good agreement. Related Articles | Metrics | Comments（0）

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Research on Layout of Pressure Taps in Flush Airdata Sensing System JIANG Yang；ZHANG Lei；LI Ming JOURNAL OF ASTRONAUTIC METROLOGY AND MEASUREMENT    2016, 36 (6): 56-60.   DOI: 10.12060/j.issn.1000-7202.2016.36.6.56 Abstract （245）      PDF（pc） （2996KB）（1348）       Knowledge map    Save Flush airdata sensing system is an advanced airdata sensing system，in which airdata are inferred from nonintrusive surface pressure measurements using a nonlinear pressure model and a nonlinear solution algorithm．The layout of pressure taps in flush airdata sensing system was researched by analyzing the convergence of data calculation under different layouts with ripples algorithm and demonstrated with calculation precision under different layouts with white noise influence. Reference | Related Articles | Metrics | Comments（0）

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Application of Generalized Regression Neural Network in Short-time Prediction for Satellite Clock Error LEI Yu；ZHAO Dan-ning JOURNAL OF ASTRONAUTIC METROLOGY AND MEASUREMENT    2013, 33 (4): 39-44.   DOI: 10.12060/j.issn.1000-7202.2013.04.10 Abstract （143）      PDF（pc） （2848KB）（1340）       Knowledge map    Save Neural Network(NN) has been widely used in forecast of nonlinear systems over the past years. Generalized Regression Neural Network(GRNN), which is a new kind of NN, is proposed to predict satellite clock error because of its nonlinear characteristic. An slip window pattern is used organize sample data, which can raise utilization rate of data. In order to improve forecast ability of GRNN, the method called K-fold Cross-Validation is employed to train network. Furthermore, the optimal smoothing factor is determined in terms of Root Mean Square Error(RMSE). An experiment is carried out to verify GRNN effectiveness. Real satellite clock error data from International GNSS Service(IGS) is trained to construct the GRNN model, then this model is used to predict clock error. And also Clock error is forecasted using quadratic polynomial. Results show that GRNN model can reach ns-level prediction accuracy within 24 hour. Moreover, GNRR is more stable in comparison with quadratic polynomial. GRNN is worse than quadratic polynomial when predicting linear clock error, however, the former is obviously better than the latter when nonlinear clock error. Related Articles | Metrics | Comments（0）

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Research on Fiber Sensing Measurement for Spacecraft FENG Zhong-wei；RONG Gang；JIANG Shuang；ZHANG Sheng-yan JOURNAL OF ASTRONAUTIC METROLOGY AND MEASUREMENT    2017, 37 (2): 5-9.   DOI: 10.12060/j.issn.1000-7202.2017.02.02 Abstract （270）      PDF（pc） （4254KB）（1334）       Knowledge map    Save The application of fiber sensing measurement for spacecraft is explored extensively towards the special requirement and limitation brought by the space environment. The fiber grating is selected from various techniques to transfer the physics such as temperature, pressure into signal. The design and realization of the demodulation for the fiber grating sensing system are analyzed comprehensively. CCSDS recommendations are applied to package and transmit the measuring data. Methods are explored aiming to improve the environmental suitability of the measuring system towards the special requirement of the mechanical and radiation environment. A feasible solution for the measurement of space physical parameter is promoted. Reference | Related Articles | Metrics | Comments（0）

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Research of Test Method the Conductive Slip Ring WANG Yang;CHEN Yan-ling;YU Zhi-hong;WANG Xiao-ming JOURNAL OF ASTRONAUTIC METROLOGY AND MEASUREMENT    2012, 32 (6): 72-76.   DOI: 10.12060/j.issn.1000-7202.2012.06.17 Abstract （254）      PDF（pc） （3387KB）（1327）       Knowledge map    Save The test items of the conductive slip ring, including insulation resistance, contact resistance, contact resistance variation, current carrying capacity, value of isolation, electromagnetic noise and transmission capability are formulated, and a detailed test method is made out for every test item, which establishes very good foundation for the effective measurement. Related Articles | Metrics | Comments（0）

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The Radiation Testing Research of Radiometric Calibration Source of the Large Aperture Integrating Sphere YE Zhao；REN Jian-wei；LI Bao-yong；LI Xian-sheng；LIU Ze-xun；WAN Zhi JOURNAL OF ASTRONAUTIC METROLOGY AND MEASUREMENT    2012, 32 (3): 39-44.   DOI: 10.12060/j.issn.1000-7202.2012.03.10 Abstract （242）      PDF（pc） （2863KB）（1319）       Knowledge map    Save At present, the space optical remote sensor of china is heading for a large-scale, high-precision development. With that, radiometric calibration device also develops. Systematically, this paper describes the test method that is used to detect the radiance of the large aperture integrating sphere. A testing system is manufactured to test the radiation characteristics of the large aperture integrating sphere, including not only the uniformity, the stability, the cosine characteristics, but also the output uncertainty of the integrating sphere light radiation source calibration system. The diameter of the integrating sphere is 3 000mm, the Opening diameter of the integrating sphere is 1 000mm. Obtained results indicate that the uniformity is 0.11%, the maximum offset of the cosine characteristics is 1.1% at ±20°, and the output uncertainty of this system is 5.94%. Related Articles | Metrics | Comments（0）

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Study for Multi-spectral Axes Parallelism Calibration of Photoelectric Tracking and Aiming System LIU Ya-chen；ZHANG Xin-lei；GAO Yang；LU Hai；ZHAO Jian JOURNAL OF ASTRONAUTIC METROLOGY AND MEASUREMENT    2015, 35 (4): 5-8.   DOI: 10.12060/j.issn.1000-7202.2015.04.02 Abstract （213）      PDF（pc） （3121KB）（1316）       Knowledge map    Save A multi-spectral axes parallelism calibration method of photoelectric tracking and aiming system is proposed, which has combined the advantages of the large-aperture collimator and the small-aperture collimator. This method can also be adapted to the parallelism calibration of multi-spectral or different distribution spectral axes. Based on this calibration method, the multi-spectral axes parallelism calibration device is developed and tested to verify the feasibility. Related Articles | Metrics | Comments（0）

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Design of Intellectualized Power Distribution System Based on VPX Bus JIANG Shuang;ZHANG Xiang;PAN Jiang-jiang;ZHAO Yan JOURNAL OF ASTRONAUTIC METROLOGY AND MEASUREMENT    2016, 36 (6): 74-76.   DOI: 10.12060/j.issn.1000-7202.2016.36.6.74 Abstract （242）      PDF（pc） （2177KB）（1312）       Knowledge map    Save Technical standard and technique characteristics of VPX bus were introduced. The composition and function of power supply and distribution system using VPX bus were presented. And then, based on VPX bus architecture, the power supply, control and instruction of VPX board was analyzed, and the technical proposal was finished. Some experiments which optimized board configure were carried out, and the result proved that the power supply and distribution system using VPX bus architecture has a superior stability. Then the system had applied foreground. Reference | Related Articles | Metrics | Comments（0）

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Research on Reliability-estimating Method for the UAV LU Xiao-lin;ZHU Wen-lai JOURNAL OF ASTRONAUTIC METROLOGY AND MEASUREMENT    2012, 32 (6): 77-79.   DOI: 10.12060/j.issn.1000-7202.2012.06.18 Abstract （333）      PDF（pc） （3387KB）（1300）       Knowledge map    Save Based on the reliability statistic character of UAV , the method of estimating the reliability of the binomial distribution system and the exponential distribution unit is analyzed, and is successfully applied in reliability tests of a UAV. It has a salutary experience for other equipments to test reliability. Related Articles | Metrics | Comments（0）

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Research on Calibration of Low Current Measurement Unit XU Ying-chun；MO Wei；LIU Chong；YU Li-hong JOURNAL OF ASTRONAUTIC METROLOGY AND MEASUREMENT    2012, 32 (3): 35-38.   DOI: 10.12060/j.issn.1000-7202.2012.03.09 Abstract （210）      PDF（pc） （2863KB）（1281）       Knowledge map    Save Low-current test instruments (such as the electrometer, Pico ammeters, source/measure units, semiconductor precision analyzers, etc.) play an extremely important role in the electronic and aerospace field and model engineering. The current measurement resolution level of fA grade touched its physical limit. It is a new metrology challenge that the precision low current measurement instruments of high sensitivity and strong resolution are calibrated. Fluke Instrument's 5440B and self-developed NIM-TΩ was used to constitute test platform in this article to calibrate Keithley Instrument's 6517B (current range: 20pA~2μA). Visual C + + 6.0 was used to develop calibrating software through analysis of measurement results. The metrology difficult problem of low current measurement unit calibration was solved. Related Articles | Metrics | Comments（0）

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Modal Analysis of Truss Structure Based on Ansys ZHANG Jun-xiu;LIU Jun-song;JIANG Wen;LIU Peng;CAO Yu-mei JOURNAL OF ASTRONAUTIC METROLOGY AND MEASUREMENT    2012, 32 (6): 17-20.   DOI: 10.12060/j.issn.1000-7202.2012.06.05 Abstract （334）      PDF（pc） （3387KB）（1279）       Knowledge map    Save Modal analysis is the foundation of dynamic analysis. The finite element method is analyzed by using ANSYS software taking truss structure as a example. It would provide modal parameter like natural frequency, and we can get a better design according to the parameter, like  enhancing the rigidity of truss structure and improve the natural frequency to avoid resonating. Related Articles | Metrics | Comments（0）

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Study of Test Method for Solar Array Simulator Power Sapply SUN Yi;LUO Zhen JOURNAL OF ASTRONAUTIC METROLOGY AND MEASUREMENT    2012, 32 (6): 67-71.   DOI: 10.12060/j.issn.1000-7202.2012.06.16 Abstract （171）      PDF（pc） （3387KB）（1265）       Knowledge map    Save The principle of Solar array simulator power supply (SAS), the differences and relations between Verification Regulation and SAS testing, and recommended test items and method are introduced. SAS is a core equipment for power supply subsystem of spacecraft ground testing. Its technical performance will directly affect the quality of spacecraft ground testing, thereby affect the reliability of spacecraft. Related Articles | Metrics | Comments（0）

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The Reaserch of Data Acquisition Method with Real-Time for Angle and Linear Encoder ZHANG Xin-lei；GAO Yang；LIU Ya-chen；MAI ji JOURNAL OF ASTRONAUTIC METROLOGY AND MEASUREMENT    2013, 33 (2): 27-33.   DOI: 10.12060/j.issn.1000-7202.2013.02.06 Abstract （209）      PDF（pc） （2826KB）（1250）       Knowledge map    Save The high accuracy angle and liner encoder are used widely in metolgy and measurement.In the field of servo control for INS Mesuremend Device ,to improve the positioning accuracy and repeatability , rate accuracy and stability , The data acquisition circuit with the high multiple interpolation are applied for positioning and rate control.The data acquisition method in the Real Time System is Reaserched with a multifunctional interpolation counter circuit (IK220).The method acts markedly and effectively on the precision servo control in practice. Related Articles | Metrics | Comments（0）

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Design of Ping-pong Buffer Structure for Hyperspectral Infrared Imaging System ZHOU Yang;YANG Hong-hai;LIU Yong;FU Qiang JOURNAL OF ASTRONAUTIC METROLOGY AND MEASUREMENT    2017, 37 (2): 1-4.   DOI: 10.12060/j.issn.1000-7202.2017.02.01 Abstract （199）      PDF（pc） （3496KB）（1247）       Knowledge map    Save A ping-pong buffer structure belonging to the hyperspectral imaging system is introduced which can effectively coordinate data transmission and processing speed by comparing with two other common ways of caching. The operation and control principle of ping-pong buffer structure is discussed. Based on the platform which consists of high-speed large-capacity SRAM and high-performance FPGA device，a ping-pong buffer structure to adapt to the hyperspectral imaging data transmission system is designed. Also the RTL simulation and the board-level verification are completed. Experiments show that this structure is efficient at seamless buffering and processing the real-time video data, and effectively improves the efficiency of the system，and proved to be stable and reliable. Reference | Related Articles | Metrics | Comments（0）