Table of Content

25 February 2018, Volume 38 Issue 1

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Status Quo and Development Tendency of Aerospace Application of#br# Automatic Test Technique

LIU Xiang-yang；LENG Chun-xue；HUANG Qi-tao；WANG Ning-fei

2018, 38(1):  1-5.  doi:10.12060/j.issn.1000-7202.2018.01.01

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There is a strong requirement for the aerospace application of automatic test technique. To solve the problems of the current aerospace automatic test system such as the weak commonality and the incommodity of device test and maintaining, this paper reviewed the current situation of its application in the performance test and health monitoring of aerospace key assemblies, AIT of aerospace product and TT&C system. Their future trend and key techniques was also discussed.

Length Unit and Distance Measurement in Space Metrology

LIU Min；DU Xiao-shuang；FENG Wei-li

2018, 38(1):  6-11.  doi:10.12060/j.issn.1000-7202.2018.01.02

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The definition of length unit is found on the theory that light goes straight, light speed is constant in vac?uum, and light velocity is isotropy. The straight-line of 2-Dimension on sphere is looked like curve geodesic in space of 3-Dimension; and the straight-line in 3-D space is also curve geodesic in 4-D space-time. However, whether this definition is suitable for 4-D space-time or not? The definition of SI second and SI meter is the same with whole global space-time,but we must clear the difference between proper time and coordinate time when we use them. Einstein’s Special Relativity theory and the principle of light speed constant are only used on inertial-system, cannot be used on non-inertial-system.For example on non-inertial-system of rotation plate, we use coordinate transfer and calculation of space-time metric by GR to realize the phenomenon that space-time is curve and light goes non-straight path. For example to measure distance between satellite and earth-station, we calculate a special case of Sagnac Effect on non-inertial-system. Brief research show that range of distance extend from local to large area in space, these effects such as relative velocity, gravity red-shift and Sagnac, will become important influence factor of uncertainty of measuring distance. So the theory of Space Metrology must be found on the theory of General Relativity（GR）, and take the viewpoint of space-time on 4-Dimension to under?stand the problem of distance measurement.

Development and Application of Quantum Voltage

ZHU Zhu；KANG Yan；WANG Lu； HU Yi-fei

2018, 38(1):  12-17.  doi:10.12060/j.issn.1000-7202.2018.01.03

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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.

Development of Control System for Planeness of Compact Range#br# Measurememt Scanner

KOU Peng；SUN Xiang-xi；REN Tao；SUN Yu

2018, 38(1):  18-22.  doi:10.12060/j.issn.1000-7202.2018.01.04

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The measurement scanner is one of the key equipments for measurement system of the compact range.Scan planeness of scanner is one of the key indicators that affect measurement accuracy. In this paper, a real-time compen?sation for planeness of the measurement scanner is designed, for a large polar scanner with a scanning area of φ6m. The real-time compensation system can detect the positional deviation of the scan plane relative to the reference plane in real time and the servo compensation agency completes the compensation. The test results show that the real-time compensation system can accurately and quickly complete the planeness compensation. Compared with the semi-real-time compensation method, it has a higher efficiency and accuracy. Presently, the real-time compensation system has been successfully applied to the calibration of compact range.

Research on E-field Probe Calibration in Reverberation Chamber

WANG Song-yu；QI Wan-quan

2018, 38(1):  23-26.  doi:10.12060/j.issn.1000-7202.2018.01.05

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The calibration of an E-field probe at high field is concerned. The method of E-field probe calibration in reverberation chamber is proposed in the paper. It introduces the calibration principle of E-field probe calibration in reverberation chamber. It resolves the problem of E-field probe calibration above 200V/m. Compare the measurement result with the result measured in the microwave field strength standard. The two groups of measurement result behave well in co?
incidence.

Research on Calibration Technology of Target Echo Simulator for#br# Pulse Doppler Radar Seeker

DENG Qian-lan；LU Zhong-jie；XIN Kang

2018, 38(1):  27-31.  doi:10.12060/j.issn.1000-7202.2018.01.06

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The calibration method of the target echo simulator for pulse doppler radar seeker based on software radio is prposed in this paper. The conversion of a calibrated RF signal to an IF signal and A/D conversion of the IF signal is realized by using spectrum analyzer and oscilloscope which formed the calibration device. The digital quadration demodulation and parameter extraction algorithm of the signal after A/D conversion is achieved by means of LabVIEW and then automatic calibration of the pulse amplitude,doppler frequency and delay parameters of the target echo simulator for radar seeker.

Research on AC Quantum Hall Resistance Standard and Application

HUANG Xiao-ding；CAI Jian-zhen；TONG Ya-zhen

2018, 38(1):  32-36.  doi:10.12060/j.issn.1000-7202.2018.01.07

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AC resistance usually shows AC-DC difference of frequency response in ac current flow. And then calibration and tracing the value of ac resistor is a hard work in metrology area. Operator can trace the ac resistor’s value with calculable resistor of AC-DC difference. But the stability and coherence of the calculable resistor of AC-DC difference are in poor condition. In further step, AC quantum hall resistance standard work well as a new ac resistance value tracing method, in condition making good state of ac quantum hall effect reduplication and tracing precision to ac resistance standard.In this paper we introduce a split shield method of quantum hall resistance for avoiding frequency response. Also a high precision at nE-8 degree tracing method is introduced with 4 terminal pair ac bridge，together with high precision 4 terminal pair ac bridge calibration method with equal potential shield. The application area of ac quantum hall resistance standard is introduced.

Research of Calibrator for Temperature Characteristic of Hall-Effect Magnetometer

YANG Yun ZHOU Ying BAO Zhong

2018, 38(1):  37-41.  doi:10.12060/j.issn.1000-7202.2018.01.08

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The temperature coefficient and the zero tesla temperature drift are key parameters which decide the hall-effect magnetometer’s measurement error. The paper analyses the relation between parameters based on the hall-effect under different temperatures. From research we develop the calibrator and the calibrate specification. The calibrator’s ability is improved through tests.

Research on the UAV Measurement System of Phased Array Antenna Pattern

SUO Wei；SONG Yang

2018, 38(1):  42-47.  doi:10.12060/j.issn.1000-7202.2018.01.09

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Aiming at the measurement requirements of antenna pattern on large M wave receiving phased array antennas, this paper studies a kind of UAV-based measurement system. This paper expounds the necessity, feasibility and related technical problems of the measurement system in antenna pattern measurement application; qualitatively analyses the sources of various measurement errors in UAV measurement on phased array antennas; explores and proposes a kind of
measurement system design and ideas which is highly targeted and high realizable in project.

Research on Testing Method for Modulation Parameter of Discontinuous Radiation Radar Signal

REN Li-li； XU Hai-yan； ZHANG Ying

2018, 38(1):  48-51.  doi:10.12060/j.issn.1000-7202.2018.01.10

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Aiming at the problem of modulation parameter measurement of discontinuous radiation radar signal, a method based on FSW spectrum and software radio technology is proposed. By analyzing the characteristics of discontinuous radiation radar signal, the test scheme of modulation parameter of discontinuous radiation radar signal is given, and the fast testing problem of field modulation parameters and coding characteristics is solved.

Design of Transceiver Integrated Radio Altimeter

TAO De-gui； LIU Guan-xin

2018, 38(1):  52-58.  doi:10.12060/j.issn.1000-7202.2018.01.11

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In order to meet the needs of small and medium grazing sea aircraft on the radio altimeters, a transceiver integrated radio altimeter was designed based on the IVS948 module. The influence of the sawtooth wave and the symmetrical triangular wave modulated signal on the measurement height was analyzed and compared with the linear frequency modulated continuous wave system. The selection of other main parameters was also calculated and analyzed. The key aspects of each working mode in the software operation flow were specified Description, and FFT-CZT algorithm into the height measurement. After the project prototype with the fly test, the measurement data and GPS differential height data consistent. The results show that the radio altimeter is reliable, the measurement data is credible and the precision is high. It can be used in flight control system of small and medium size skimming sea-based aircraft.

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

2018, 38(1):  59-62.  doi:10.12060/j.issn.1000-7202.2018.01.12

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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.

A Special Fixture for Three-dimensional Measurement of Metal#br# Bonding Wire based on CT Technology

JING Xiao-dong； LIU Chen ；WU Ai-hua； LIANG Fa-guo； FAN Ya-jie

2018, 38(1):  63-67.  doi:10.12060/j.issn.1000-7202.2018.01.13

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The accurate measurement of the three-dimensional appearance of metal bonding wire and the simulation of the S parameters of bonded wire are important means to evaluate the influence of bonding wire on device cascade process. X ray computed tomography is an effective tool for measuring metal bonding wire in cascaded circuit chip. Due to the particularity of material, shape and size of bonding wire in cascade circuit chip, we need to design a special fixture to improve the measurement accuracy. In this article, a new type of measuring fixture with more stable and higher accuracy is designed by structural optimization and material screening.

Research on the Detection Method of Pipeline Welding#br# Position based on Capacitance Sensor

LI Hong-min； GUO Li-yang； SONG Guan-feng； LI Bin； TIAN Zhao-peng； MU Xue-cheng

2018, 38(1):  68-73.  doi:10.12060/j.issn.1000-7202.2018.01.14

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Application of coating process is an important link in pipeline corrosion prevention technology. It is important to get the best anti-corrosion protection layer and the coating process of the pipeline. Therefore, it is necessary to conduct effective detection of pipeline weld location area. Combining with the characteristics of pipeline coating process, based on the advantages and disadvantages of several kinds of commonly used detection scheme comparison, demonstrates the feasibility of detection technology based on the non-contact measuring capacitance method, and at the same time the pipe weld position detection results are data analysis and processing, and rapid transmission to the spraying device control host, effectively control the seam thickness, thus achieve the goal of improve the quality of coating.

An Approach to the Metrological Guarantee for Weapon System

QU Shu-lan；LI Bing；GONG Da

2018, 38(1):  74-76.  doi:10.12060/j.issn.1000-7202.2018.01.15

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In order to adapt to the complexity of the product development of weapon system and the diversification of evaluation indexes, to continuously improve the quality evaluation system for weapon system, this paper presents the ideal of integrating measurability at the initial phase of the product development according to the characteristics of weapon system development. The evaluation needs analysis, evaluation plan and measurement are applied to the phases of product program, development, production, testing and thus to simultaneously modify the metrological guarantee with the product design and development. Through carrying out the whole phases and life-cycle evaluation assurance for the weapon system, the metrological guarantee of the products is improved so as to ensure the unification of statistical criteria and the reliability of the data among the development, production, testing and delivery of the product. Through the application in some typical production development, our ideal has significantly improved the metrological evaluation for products and has played an essential role in the success of weapon system testing.

Metrological Confirmation of Lower Power Standards

WANG Lin-lin； YU Qi； HAN Xiao-ming ；SONG Wan-bo ；YANG Yang

2018, 38(1):  77-80.  doi:10.12060/j.issn.1000-7202.2018.01.16

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The calibration factor of the power sensor directly affects the accuracy of the power measurement. The Metrological confirmation is an important link to ensure the accurate and reliable transmission of the power transmission value. This article mainly discusses a method that the microwave low-power standard device uses for Metrological confirmation in the laboratory. Based on the concept of measurement compatibility of measurement results, combined with the probability distribution in the transmission process of small power standard devices, a specific and quantifiable implementation method is given to engineers.