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Design of Auto Tracking Smart Car based on CCD SI Kai-bo；HUANG Jian；LV Lin-tao JOURNAL OF ASTRONAUTIC METROLOGY AND MEASUREMENT    2019, 39 (5): 71-75.   DOI: 10.12060/j.issn.1000-7202.2019.05.13 Abstract （794）      PDF（pc） （17083KB）（318）       Knowledge map    Save ]In order to realize the automatic line inspection of the car,a CCD camera is used to identify the runway of different colors,and the black line is selected in the test.The CCD has 128×1 pixels and can collect 128 linear array data at a time.it can be converted to 128 8-bit binary numbers,which are output through A/D interface and connected with STM32 microprocessor.The software is used to collect and process the data.The median algorithm is used to find the edges on both sides of the black line and determine the center of the black line.The offset between the center of the car and the center of the black line is calculated to control whether the car turns left,right or straight.The encoder is used to measure the speed of the wheels and the speed PID algorithm is used to control the driving of the car in order to realize the automatic line patrol.The test results show that the CCD line-patrolling intelligent vehicle can realize the function of automatic line-patrolling.It can not only automatically track black lines,but also track lines of other colors,which improves the speed of the cars line-patrolling.It provides a new method and a new idea for the automatic line-following car. Related Articles | Metrics | Comments（0）

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The Calculation of Mean Spiral Angle with Conical-shaped Thread CHEN Zheng；WANG Yu-ping JOURNAL OF ASTRONAUTIC METROLOGY AND MEASUREMENT    2013, 33 (2): 34-35.   DOI: 10.12060/j.issn.1000-7202.2013.02.07 Abstract （656）      PDF（pc） （2826KB）（966）       Knowledge map    Save In the universal tool microscope, there would be tilted at an angle for the column of the central microscope by using image method to measuring the parameters (for example: pitch, half of thread angle etc.) of conical outer thread. And the difference from measuring the common cylindrical outer thread is that the angle called the mean spiral angle is a mean value. The three kinds of calculation formulas with their derivation processes for the mean helix angle are introduced. 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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Discussion on JJG 860-2015 Verification Regulation of  Pressure Transducer (Static) JIAO Xin-xin；WANG Xiao-san；XIAN Bao-jin；LIU Xin；WANG Hui-long；ZHU Gang JOURNAL OF ASTRONAUTIC METROLOGY AND MEASUREMENT    2017, 37 (2): 49-53.   DOI: 10.12060/j.issn.1000-7202.2017.02.10 Abstract （584）      PDF（pc） （3175KB）（564）       Knowledge map    Save Main variations of a new Pressure Transducer (Static) Verification Regulation JJG 860-2015 are introduced. Discussions are carried out on the selection of the test instruments and the verification methods for specific pressure transducers. The necessity of adding two new performance indicators, the zero shift and the cycle stability, is demonstrated according to some test cases. Furthermore, some improvement suggestions for this regulation are proposed. 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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Progress and Prospects for the Measurement Research on the Moment of Inertia WANG Xiao-san；LIU Yun-ping；NI Huai-sheng；ZHANG Ning JOURNAL OF ASTRONAUTIC METROLOGY AND MEASUREMENT    2019, 39 (2): 1-5.   DOI: 10.12060/j.issn.1000-7202.2019.02.01 Abstract （462）      PDF（pc） （15113KB）（340）       Knowledge map    Save A review on the measurement research of the moment of inertia is carried out. The principles of some current measurement methods of the moment of inertia, such as the trilinear pendulum method, the torsion pendulum method and the falling body method, are summarized as well as their advantages and disadvantages. A new method aimed at these disadvantages is introduced, which is prospected to be a development direction for the measurement of the moment of inertia. 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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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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Study on Engineering Design Method of Aerostatic Pressure Gas Bearing WANG Chun-xi；JIANG Yun-xiang；ZHANG Lin-dong；WU Yue；WANG Qiang；FENG Wei-li JOURNAL OF ASTRONAUTIC METROLOGY AND MEASUREMENT    2018, 38 (2): 11-16.   DOI: 10.12060/j.issn.1000-7202.2018.02.03 Abstract （430）      PDF（pc） （17425KB）（356）       Knowledge map    Save Aerostatic pressure gas bearing is the key component of the rotary support shaft system of the inertial device test platform, its bearing capacity and rotation accuracy have an important effect on the test accuracy of the  inertial devices.In order to improve the design efficiency and simplify the design method, under the condition of satisfying the performance of aerostatic bearing, the engineering design formula of aerostatic bearing is deduced. Bidirectional aerostatic bearing is designed. The bearing capacity, stiffness, air consumption and friction torque of the bearing are calculated, and the simulation results are compared with the finite element simulation results. The effectiveness of the design method is verified. Related Articles | Metrics | Comments（0）

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Prepareation of Standard Solution of Reserpine in Methanol Aqueous for LC-MS Calibration LI Yan-ling；ZHOU Tong；JI Ke-jian；LIU Yuan-jun；GAO Yan-li；ZHAO Xiao-gang JOURNAL OF ASTRONAUTIC METROLOGY AND MEASUREMENT    2014, 34 (5): 61-64.   DOI: 10.12060/j.issn.1000-7202.2014.05.15 Abstract （421）      PDF（pc） （2606KB）（988）       Knowledge map    Save Standard solution of reserpine in methanol aqueous for LC-MS calibration was developed. The puriety of reserpine powder was certified with credible methods. The standard solution was prepared by weight-volumetric method using the reserpine powder as solute and the methanol aqueous as solvent. Uniformity and stability of standard solution was analyzed by F test and regression curve method respectively, the uncertainty of the results was evaluated. The result showed that uniformity and stability of the standard solution of reserpine in methanol aqueous was better, the relative standard uncertainty of concentration was 3%（k=2）. 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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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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Research of Components in Rocket Kerosene by Comprehensive Two-Dimensional Gas Chromatography REN Chun-bo；SHEN Zhao-xin；MA Chen-fei；WU Qing-yuan JOURNAL OF ASTRONAUTIC METROLOGY AND MEASUREMENT    2018, 38 (4): 90-94.   DOI: 10.12060/j.issn.1000-7202.2018.04.17 Abstract （411）      PDF（pc） （18937KB）（112）       Knowledge map    Save Two-dimensional gas chromatography combined with time of flight mass spectrometry and flame ionization detector were applied for quantitive and qualitative analysis of rocket kerosene. The relationships between group-type, carbon-number distribution and capability of rocket kerosene were investigated based on the experimental data. The results show that the rocket kerosene mainly comprises isoparaffins, cycloalkanes, bicyclic alkanes. Special composition made for high combustion value and excellent stability. This research results can be used for the analysis and optimization of rocket kerosene components. Related Articles | Metrics | Comments（0）

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Development and Application of Quantum Voltage ZHU Zhu；KANG Yan；WANG Lu； HU Yi-fei JOURNAL OF ASTRONAUTIC METROLOGY AND MEASUREMENT    2018, 38 (1): 12-17.   DOI: 10.12060/j.issn.1000-7202.2018.01.03 Abstract （400）      PDF（pc） （14837KB）（284）       Knowledge map    Save This paper introduces the history, current situation, future and application of the national secondary standard of DC voltage, programmable josephson DC voltage standards, programmable quantum low frequency voltage stan?dards, wide range quantum voltage standards, pulse driven quantum voltage standards and portable quantum Voltage stan?dards with no-liquid helium mainly. Related Articles | Metrics | Comments（0）

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Research on the Application of TTE/TTP Technology with Spacecraft FENG Zhong-wei；JIANG Shuang；ZENG Fa；CHEN Yu-kun JOURNAL OF ASTRONAUTIC METROLOGY AND MEASUREMENT    2018, 38 (2): 51-54.   DOI: 10.12060/j.issn.1000-7202.2018.02.11 Abstract （399）      PDF（pc） （17425KB）（310）       Knowledge map    Save The basic principle of the TTE/TTP technology is introduced, as the advantages such as time certainty, network conflict reducing compared with event triggered network are explored. The key technology including time scheduling table design, time synchronization and dynamic adjustment of the schedule is proposed towards the application of the TTE/TTP technology with the spacecraft. A feasible solution of the TTE/TTP technology with the spacecraft is clarified to meet the needs of high reliability, strong real time and time certainty of the future development of the spacecraft.  Related Articles | Metrics | Comments（0）

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Wall Penetration Loss Correction based on Indoor Wireless Propagation Model ZHAO Ya-nan；YAN Tian-feng；WU Zhong-dong；GAO Rui JOURNAL OF ASTRONAUTIC METROLOGY AND MEASUREMENT    2019, 39 (3): 63-67.   DOI: 10.12060/j.issn.1000-7202.2019.03.12 Abstract （395）      PDF（pc） （20244KB）（383）       Knowledge map    Save K-M(Keenan-Motley)model adds the loss of the single wall to calculate the total loss of indoor wireless signal penetrating multiple walls,which exists errors .To solve this problem,a variety of indoor scenes are selected for CW (Continuous Wave)tests,and the influence factors and changing rules of wireless signal through the wall loss are analyzed.An indoor wireless model through the wall loss correction method based on artificial neural network is proposed.The test data are trained and then the prediction model is established.The experimental results show that the predicted model conforms to the model correction criterion and has good prediction accuracy in the actual indoor scenarios. Related Articles | Metrics | Comments（0）

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Study on Neutron/gamma Discrimination of Plastic Scintillator Detector QIN Xi, LI Wei, JIAO Ting-yu, LI Xiao-bo, XIAO Kai-ge, LI Shi-yao, LIU Yi-na, WANG Zhi-qiang, LIU Yun-tao Journal of Astronautic Metrology and Measurement    2021, 41 (3): 91-96.   DOI: 10.12060/j.issn.1000-7202.2021.03.16 Abstract （385）      PDF（pc） （4624KB）（244）       Knowledge map    Save Research of two discrimination methods on neutron and gamma ray has been carried out using a plastic scintillator detector EJ276 with 2 inches in diameter and 2 inches in length.In the mixed radiation field of neutron and gamma，which is generated by 241Am-Be，neutron/gamma discrimination performance of the plastic scintillator detector was studied by the linear delay method and the long and short integral time window method，respectively.The neutron/gamma discrimination effect between these two methods was compared via PSD（Pulse Shape Discrimination)diagram and FOM（Figure of Merit).The result shows that the method of charge comparison on neutron/gamma discrimination is better than the method of linear delay.And when it’s of 400 ns long gate and 60 ns short gate in the charge comparison，EJ276 has the best discrimination on neutron/gamma with lowest misjudgment ratio. Related Articles | Metrics | Comments（0）

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Conceptual Design and Reserch of Supersonic Target Drone LIU Jing；LIU Zhi-qiang JOURNAL OF ASTRONAUTIC METROLOGY AND MEASUREMENT    2016, 36 (4): 60-63.   DOI: 10.12060/j.issn.1000-7202.2016.04.12 Abstract （380）      PDF（pc） （4222KB）（897）       Knowledge map    Save According to the requirements of test and evaluation of weapon system, the general technology requirements were put forward. The conceptual design of supersonic target drone on the aircraft design procedure was finished. The dynamic system, aerodynamic configuration and aerodynamic characteristics were designed in detail. The main flight performance was calculated. The foundation of engineering implementation for the supersonic target drone has laid by the conceptual design.  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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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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Study on Three-dimensional Pose Measurement Method with Monocular Vision YUAN Yuan, LIU Ke, SUN Zeng-yu, GAO Yue, LIU Hua Journal of Astronautic Metrology and Measurement    2019, 39 (6): 1-6.   DOI: 10.12060/j.issn.1000-7202.2019.06.01 Abstract （369）      PDF（pc） （19381KB）（485）       Knowledge map    Save Aiming at the pose measurement of monocular vision based on the point characteristics, the algorithm which uses non-coplanar five coded targets is studied. The system uses the high resolution camera with large target surface which can record the pose images of a moving object, then, using the geometric constraint relations of the encoded targets in target object and the orthogonal iteration algorithm, it can realize the pose measurement of the object. The experiment result shows that the displacement uncertainty of measurement is less than 0.5mm and the pose angle uncertainty of measurement is less than 0.05°, and it can meet the measuring demands in aeronautic and aerospace engineering. Related Articles | Metrics | Comments（0）

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Summary of the Development Trend of Foreign Metrology and#br# Measurement Journal of Astronautic Metrology and Measurement    2018, 38 (5): 24-32.   DOI: 10.12060/j.issn.1000-7202.2018.05.04 Abstract （351）      PDF（pc） （13000KB）（281）       Knowledge map    Save Metrology is the science of measurement and its applications. Specifically, metrology implementation is an activity for unified measuring units and accurate, reliable quantity value, its technical level directly reflects the status of the scientific and technical development.By collecting and sorting lots of documents on the transform of units system, quantization technology, micronano dimension technology, space metrology technology, carbon nano materials technology, intelligent metrology technology. A summary of the development trend of foreign advanced metrology and measurement technology is given and a close analysis is made in this paper, providing a useful reference for the development of China’ national defense metrology and measurement. Related Articles | Metrics | Comments（0）

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Progress of Noise Standard and Measurement Method in Military Aircraft Cabin WANG Dong-jie , MAO Hong-yu, ZHAO Yu-ying, DONG Zhi-ming Journal of Astronautic Metrology and Measurement    2021, 41 (6): 82-85.   DOI: 10.12060/j.issn.1000-7202.2021.06.15 Abstract （347）      PDF（pc） （538KB）（507）       Knowledge map    Save The noise in military aircraft cabin was an important index to evaluate the noise characteristics of a military aircraft and the combat effectiveness. The research on the standard limit of military aircraft cabin noise was the basis of the aircraft noise design. This paper reviewed the relevant military standards of international military power and that of China. In addition, the measuring method of military aircraft cabin noise were introduced. The results have some reference value for the design and noise evaluation of next-generation aircraft. Related Articles | Metrics | Comments（0）

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Review on Pressure Measuring System of Pressure Scanning Valve WANG Huan, ZENG Qing-hua Journal of Astronautic Metrology and Measurement    2021, 41 (6): 76-81.   DOI: 10.12060/j.issn.1000-7202.2021.06.14 Abstract （343）      PDF（pc） （2070KB）（727）       Knowledge map    Save The development process from multi-point pressure measuring system to pressure scanning valve pressure measuring system is summarized. The main technical parameters and research progress of foreign products as well as the research status of domestic pressure scanning valve pressure measuring system are analyzed. The improvement and development direction of pressure scanning valve pressure measuring system under the demand of high precision and stability in the future are prospected. Related Articles | Metrics | Comments（0）

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Research on A Type of IR Dynamic Simulation Drone LIU Sha；WANG Zhan-tao；WANG Tao；LIN Sen；WANG Kai-lei JOURNAL OF ASTRONAUTIC METROLOGY AND MEASUREMENT    2017, 37 (2): 10-17.   DOI: 10.12060/j.issn.1000-7202.2017.02.03 Abstract （337）      PDF（pc） （5695KB）（1138）       Knowledge map    Save To meet the simulation requirement for the characteristics of the infrared radiation and the motion characteristics of target of a type of seeker, a IR dynamic simulation drone based on extend blackbody is designed, using for simulating setting target and background temperature difference, and the dynamic change of target in the field of view. The basic principle, major component, hardware system design and software realization of the IR drone are introduced, also the radiation characteristics of infrared imaging and  dynamic performance index are verified experimentally. Reference | Related Articles | Metrics | Comments（0）

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Research on Calibration Technology for Amplitude and Phase #br# Characteristics of Large Double Reflector Compact Field MA Yong-guang；YANG Jin-tao；WU Xiang；HE Xin；HUANG Cheng-zu；HUANG Jian-ling JOURNAL OF ASTRONAUTIC METROLOGY AND MEASUREMENT    2019, 39 (5): 1-4.   DOI: 10.12060/j.issn.1000-7202.2019.05.01 Abstract （336）      PDF（pc） （19815KB）（215）       Knowledge map    Save The compact field is the key device for antenna and target RCS testing.It can calibrate the spherical wave from the feed to a quasi-planar wave at close range.In order to evaluate whether the electromagnetic wave distribution generated in the quite zone of the compact field conforms to the quasi-planar wave characteristics,it is necessary to build a high-performance microwave amplitude-phase transmitting and receiving system and a large-scale multi-degree-of-freedom high-precision scanning system on site.In this paper,the performance calibration requirements of a large double reflector compact field are taken as an example.From the aspects of on-site measurement of amplitude and phase system construction,large-scale complex scanning system design,and on-site measurement implementation,the related technologies of field calibration of compact field quite zone performance are analyzed in detail.The measured results show that the calibration system built on site meets the performance requirements of the long-distance large double-reflection surfacecompact field quiet zone,and the values of each test parameter meet the design requirements of the compact field. Related Articles | Metrics | Comments（0）

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Analysis of Influence of Induction Synchronizer Pre-Processing #br# Analog Circuit Error on System Measurement Accuracy LI Tai-ping；QI Xiao-jun；XIA Zhen-tao JOURNAL OF ASTRONAUTIC METROLOGY AND MEASUREMENT    2019, 39 (6): 57-61.   DOI: 10.12060/j.issn.1000-7202.2019.06.11 Abstract （335）      PDF（pc） （19381KB）（104）       Knowledge map    Save Based on the working principle of the induction synchronizer, the stability of the tracking angle measurement system is analyzed and verified. According to the simulation, the influence of the amplitude, phase and reference signal phase shift of the induction synchronizer on the measurement accuracy of the system is analyzed, and the theoretical error model is verified. The pre-processing circuit error formula is obtained. 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）（1280）       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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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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Impact Study on S Parameters of Conical Coaxial Line using Impedance Gradient Matching Section LIU Xing-xun；ZHANG Tao JOURNAL OF ASTRONAUTIC METROLOGY AND MEASUREMENT    2015, 35 (3): 1-4.   DOI: 10.12060/j.issn.1000-7202.2015.03.01 Abstract （333）      PDF（pc） （2887KB）（1062）       Knowledge map    Save In order to make the output impedance of general instruments match with the characteristic impedance of coaxial conical, and then reduce the echo reflection, a matching section is designed. S parameters with three different kinds of impedance gradient matching sections such as index gradient line, triangle gradient line and klopfenstein gradient line are compared respectively. VRSW of matching sections are simulated respectively with changing inner conductor or outer conductor, the results show that the matching section of impedance index gradient with inner conductor changing has a good characteristic with standing wave less than 1.2 under 10GHz, less than 2.5 under 20GHz. 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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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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Phase Difference Measurement of Sinusoidal Signal based on Multi-layer Cross-correlation ZHENG Sheng-feng;CHEN Su-ming;DI Jin-hai;WANG Ben-yi JOURNAL OF ASTRONAUTIC METROLOGY AND MEASUREMENT    2012, 32 (1): 34-40.   DOI: 10.12060/j.issn.1000-7202.2012.01.09 Abstract （326）      PDF（pc） （2686KB）（965）       Knowledge map    Save A new method for phase difference measurement is introduced in this paper. Because the sinusoidal signal has a particular trait, do cross correlation to the two signals to get cross correlation function and keep the phase difference information. Multi-layer cross-correlation function is obtained by multi-layer cross correlation calculation to the cross-correlation function, and phase difference is obtained by using correlation theory. Length of sampled data, signal-noise ratio，number of ADC quantization bits and harmonic content which influence precision of phase difference measurement are particularly discussed and analyzed. Simulation results and conclusion are given. The simulations proves its feasibility and effectiveness to detect the phase difference.This method has many virtues such as simple theoretic deduction and explicit physical signification.It is especially fit for low signal-noise ratio condition or negative signal-noise ratio condition and it can get high resolution. Related Articles | Metrics | Comments（0）

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Test and Analysis on the Response Time of Thermocouple Temperature Sensor LIU Hao；ZHAO Hua-ye；WANG Wen-ge；HUANG Ze；ZHANG Qi JOURNAL OF ASTRONAUTIC METROLOGY AND MEASUREMENT    2017, 37 (6): 48-52.   DOI: 10.12060/j.issn.1000-7202.2017.06.10 Abstract （325）      PDF（pc） （19636KB）（143）       Knowledge map    Save Research on dynamic performance of temperature sensor is relevant to the measurement accuracy of transient process and real time monitoring of control system, which has major engineering value and factual significance in the field of national defense and aerospace. A testing system of dynamic performance of temperature sensor was designed to calibrate the 7 kinds of thermocouple temperature sensors with different structures. By the contrast analysis of the test results on time constant and response time, it will provide a reference in selection and application of thermocouple for temperature dynamic measurement. Related Articles | Metrics | Comments（0）

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Research on Load-carrying Properties of Screw Connection Structure Based on Magnesium Alloy ZHANG Chao-ying；MENG De-hao；YUAN Wen-quan；YAN Lu；ZHANG Zhong-wei JOURNAL OF ASTRONAUTIC METROLOGY AND MEASUREMENT    2018, 38 (2): 7-11.   DOI: 10.12060/j.issn.1000-7202.2018.02.02 Abstract （323）      PDF（pc） （17425KB）（223）       Knowledge map    Save Based on the theory of screw tension test, the quantization of screw connection was researched aiming in the aerospace-used cast magnesium alloy. And the basic properties of foundation feature were systematically given by testing the screw torsion strength, torsion-tension relation, axial bearing capacity and reuse performance, which had guiding significance for engineering application. Related Articles | Metrics | Comments（0）

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Evaluation on Accuracy Influence Factor of Dual Camera Industrial Photogrammetric System MA Tong-tong；XUAN Ya-bing；WANG Wei-feng；HUANG Gui-ping JOURNAL OF ASTRONAUTIC METROLOGY AND MEASUREMENT    2017, 37 (6): 28-34.   DOI: 10.12060/j.issn.1000-7202.2017.06.06 Abstract （322）      PDF（pc） （19636KB）（61）       Knowledge map    Save Introduced the geometric factors which influenced the measurement accuracy of the dual camera industrial photogrammetric system and conducted an experimental test on them, further optimized the precision of the dualcamera industrial photographic system; by using the high accuracy single camera system as the reference, from the respect such as the photography distance, the baseline length and the baseline deviation from the axis position of the test field, the geometric structure of the dual camera measurement system is changed, then analysed and compared with the results of their data. In conclusion, the change of the baseline length and the photography distance has a great influence on position accuracy, and the contrast between the baseline is up to 0.3mm. The change of the angle between the optical axis is less affected, only 0.04mm. Related Articles | Metrics | Comments（0）

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The Analysis of the Measurement Method and the Measurement Uncertainty for Noise Source ZHANG Xi-fu;ZHANG Qiang JOURNAL OF ASTRONAUTIC METROLOGY AND MEASUREMENT    2012, 32 (1): 49-55.   DOI: 10.12060/j.issn.1000-7202.2012.01.12 Abstract （320）      PDF（pc） （2686KB）（791）       Knowledge map    Save One of the key performance parameters for noise figure is the level of measurement uncertainty. A significant contributor to this is the uncertainty surrounding the noise source used when measuring noise figure on the device. Accurate noise source calibration is critical to minimizing noise figure uncertainty, and thus a critical factor for obtaining quality noise figure measurement. In this paper, two methods of Y-Factor and Gain are introduced to measure the microwave and millimeter-wave noise source, and the measurement uncertainties are also studied. 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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Development of Small BVA Quartz Resonator CUI Wei；WANG Zuo-yu；SUI Jian-ping；LIU Xiao-guang；WANG Li；ZHANG Lei；HASI Tu-ya；LI Guo-qiang JOURNAL OF ASTRONAUTIC METROLOGY AND MEASUREMENT    2018, 38 (1): 59-62.   DOI: 10.12060/j.issn.1000-7202.2018.01.12 Abstract （318）      PDF（pc） （14837KB）（306）       Knowledge map    Save Traditional BVA quartz resonator has the characteristics of low aging and high Q, but the weakness in size and anti-vibration limits its application and dissemination. This paper introduces a new BVA quartz resonator. By optimizing the structure design of the capacitor chip and the quartz blank, the smaller size of the quartz crystal chip and the capacitor chip is developed. The size of small BVA quartz resonator can be reduced to HC-40/U and the anti-vibration level has been improved. At the same time, its other performance is comparable to traditional BVA quartz resonator. Related Articles | Metrics | Comments（0）

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Development and Application of WR PENG Cheng-jin, YANG Jun, ZHANG Ming, LI Shi-guang Journal of Astronautic Metrology and Measurement    2018, 38 (5): 7-15.   DOI: 10.12060/j.issn.1000-7202.2018.05.02 Abstract （318）      PDF（pc） （13000KB）（394）       Knowledge map    Save This paper introduces a new technology - WR technology (White Rabbit) which is developed on the basis of Precision Clock Synchronization Protocol (PTP). Combined with synchronoμs Ethernet and double mixing time difference method, the slave clock is dynamically calibrated by continuoμs high-precision measurement of link loop delay between this two clocks to achieve sub-nanosecond or picosecond precision synchronization of master clock and slave clock. This article first introduces the history of WR development and the main technologies contained in WR, then tells the role WR plays in some scientific fields. Finally, it proposes the future application of WR in other fields. Related Articles | Metrics | Comments（0）