Table of Content

25 June 2018, Volume 38 Issue 3

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Development of Quantum Vacuum Standard

LI De-tian, CHENG Yong-jun, XI Zhen-hua

2018, 38(3):  1-15.  doi:10.12060/j.issn.1000-7202.2018.03.01

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In 2018, there will be a major revision of the International System of Units (SI) which will result in all of the seven base units being defined or reworded by fixing the values of certain atomic or fundamental constants. The future of vacuum metrology will rely on quantum-based primary standard based on optical methods which represents a disruptive change in the way of realizing and disseminating the SI unit of pressure, the pascal. Compared to conventional standards, these new quantum-based vacuum primary standards will potentially enable zero-chain SI traceability, fast response time, high accuracy and unrestricted circumstance. The research and development of quantum-based primary vacuum standard launched by NIST, PTB and SNTRI in the field of vacuum metrology are reviewed. The paper reviews the theoretical and experimental foundations and key technologies of three methods, including refractive index method, absorption method and
rate of cold atom loss method.

Testing and Calibrating Technology in General Assembly of Large Satellites

YAN Rong-xin, WANG Yong, SUN Wei, CHEN Mian, YANG Zai-hua, WANG Li-na

2018, 38(3):  16-23.  doi:10.12060/j.issn.1000-7202.2018.03.02

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To accurately measure large satellites leakage rate, alignment and mass property in general assemble production，the local and total leak testing technique with calibration equipment were developed which based on quadrupole mass spectrometer and helium mass spectrometer. The seal performance of large satellite electrical propeller was accuratelymeasured and calibrated comparatively in time. The satellite mass property testing equipment and compare standard rotor of large load bearing based on three coordinate conversion machine has been set up, and all axis satellite mass property can be measured just one hoist. A laser tracker uniting theodolite measure system with high positional precision and high angle measurement accuracy has been developed. A benchmark transfer was produced to carry out unification coordinateness and calibration timely. Several large satellites have been tested in the process of AIT with the testing equipment. The quality of the large satellite has been effectively guaranteed.

The Development of Microwave Ultra-broadband and High-speed Digital Control Amplitude Regulator

ZHANG Bo, TIAN Yun-feng, WANG Xin-yang, SONG Yang, LI Dong-liang

2018, 38(3):  24-26.  doi:10.12060/j.issn.1000-7202.2018.03.03

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Microwave amplitude regulate technology is one of the microwave frequency synthesis technologies to realize high precision and small frequency step of microwave output signal. As an important part of frequency synthesizer, the criteria of microwave amplitude regulator has dicisive influence on the power performance of frequency synthesizer. This paper gives a summary of background and status of microwave ultra-broadband and high-speed amplitude control, then recommends in detail the design principle, the design method, the implement measures and the target of microwave ultra-broadband and high-speed digital control amplitude regulator.

Technical Research on Distributed Intelligent Launch Control based on CAN Bus

AO Ya-na

2018, 38(3):  27-31.  doi:10.12060/j.issn.1000-7202.2018.03.04

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Missile ground launch control equipments always use centralized control technology. With the increase of the control scale and complexity of the system, the performance requirements of the control computer in the launch control equipments are getting higher and higher, and the system is getting more complex. This paper presents a distributed intelligent launch control technology based on CAN bus, and gives the specific solution under the development of a launch control equipment. In this scheme, a general SOPC computer module is used as the upper computer, and several DSP control modules are used as the lower computer. The CAN bus is used to communicate with the upper and lower computer to realize the launch control of several missiles. The distributed control system has the characteristics of small size, low power consumption, high reliability, good maintainability, low cost and so on. It provides a new technical way for intelligent launch control.

Micro-motion Features Analysis for Air Targets based on Sparse Time-frequency Decomposition

WANG Yan-qing, HUO Chao-ying, YIN Hong-cheng, MAN Liang

2018, 38(3):  32-37.  doi:10.12060/j.issn.1000-7202.2018.03.05

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Take the helicopter RCS signal as an example, the sparse time-frequency decomposition method is researched in this paper. Firstly, an over-complete dictionary is constructed with Gabor atoms. Then the RCS signal is decomposed using matching pursuit algorithm based on Gabor atom dictionary, and the best matching atoms are found by genetic algorithm. At last, the signal’s WVD distribution with no cross-interference is obtained by superposing the results of each decomposed Gabor atom’s WVD distribution. The simulation results show that the proposed method can improve the efficiency of sparse decomposition and express the signal WVD with a few Gabor atoms. Compared with Wigner-Ville distribution, this method can maintain high time-frequency resolution with no cross-interference.

Research on Local Oscillation Generation for an Ultra Wideband Frequency Converting System

WANG Xin-yang, TIAN Yun-feng, GAO Zi-yang, SONG Yang, ZHANG Bo

2018, 38(3):  38-42.  doi:10.12060/j.issn.1000-7202.2018.03.06

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Local oscillators are core components of ultra wideband (UWB) frequency converting systems. This paper introduces the techniques of local oscillation generation for a frequency converting system, taking a UWB up-converting system as example. The designed UWB frequency converting system converts a lower band of 0.8GHz~2.8GHz to an upper band of 0.5GHz~40GHz through three up-conversions. For the frequency conversion a series of single-tone oscillators and wideband oscillators are needed, which are generated by PLL+DDS and DDS+DPS techniques respectively.

Study on the Application of Hydrogen Maser in Clock Allocation

LI Bian, QU Li-li, CHEN Yong-qi

2018, 38(3):  43-47.  doi:10.12060/j.issn.1000-7202.2018.03.07

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Because of excellent low phase noise characteristics, the hydrogen maser is widely used in high-precision time/frequency measurement and comparison. For some time laboratories having a high requirement for the physical signal noise characteristics, the hydrogen maser becomes an indispensable frequency source of a clock group. However, due to physical structure and working ways and so on, the hydrogen maser has obvious frequency drift features. In addition it is more expensive than the cesium clock, so the number of hydrogen maser becomes a core problem needed to resolve in the clock group configuration. In this paper, it is the necessity of hydrogen maser that is analyzed firstly in the clock group configuration, then a variety of configuration modes are presented by establishing the mathematical models of clock group optimal configurations with several time laboratories data of atomic clocks and adopting statistical methods. And by analyzing and comparing the performance of the clock group in different configuration styles, the optimal clock group configuring scheme, which is on the condition of the known stabilities, is put forward for small and medium-sized time laboratories.

A Calibration Method based on Portable Station for Equipment Time Delay of Ground Station for Transponder Ranging

HUANG Cheng-qiang, YANG Xu-hai, LI Wei-chao, CHEN Liang, CAO Fen, LIU Ya

2018, 38(3):  48-53.  doi:10.12060/j.issn.1000-7202.2018.03.08

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In the system of orbit observation and determination via transponder, the range measurement between satellite and ground station based on the principle of pseudo ranging is the basis for precise satellite orbit determination and time comparison. In order to obtain the precise range measurement between satellite and ground station, we need to deduct the equipment time delay of ground station from the pseudo ranging value. On the basis of the observation principle of satellite for transponder ranging, a calibration method based on portable station for equipment time delay of ground station for transponder ranging is introduced, the equipment time delay of ground station for transponder ranging is calibrated based on this method, the results show that the accuracy of calibration can be better than 0.5 ns, meanwhile, the results play an important role in improving the accuracy of satellite orbit determination and two-way satellite time and frequency transfer (TWSTFT).

Research and Application on Ground Software Gateway Technology

DIAO Wei-he, ZHANG Ya-fei, PAN Shun-liang, TAN Zheng, PENG Chao-ran

2018, 38(3):  54-60.  doi:10.12060/j.issn.1000-7202.2018.03.09

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In this paper, according to the study of integrated space and terrestrial information network, especially the key to the protocol based on“ IP over CCSDS”, the ground software gateway technology is proposed. Two key technologies are described, including“ data link layer protocol parsing & quot” and“ network layer IP packets transparent through”. Compared with the traditional ground gateway using hardware technology, the new method has low cost, more flexible configuration, and stronger portability. At the same time, the method is not bound by using environment and the numbers of users. Finally, the effectiveness of the new technology is validated by the examination of video communication from space to ground.

Microwave Power Beam Steering Accuracy Analysis of MW-Level SPS

DONG Shi-wei, DONG Ya-zhou, WANG Ying, YU Xu-min, LI Xiao-jun, HOU Xin-bin, WANG Li

2018, 38(3):  61-66.  doi:10.12060/j.issn.1000-7202.2018.03.10

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Mega-watt-level SPS serves as a milestone of development of SPS cause. The microwave power beam steering accuracy affects beam collection efficiency of its microwave power transmission system. Reasonable beam steering accuracy is aimed at for power transmission antenna with hundreds of meters aperture. With respect of gradual varying performance of the power beam, analysis model of MPT beam steering accuracy is setup and the analysis method proposed, regarding the power transmitting and collecting apertures, transmission distance and operating frequency as the boundaries. Digital simulations are conducted applying the proposed method. According to the results, the MPT beam steering accuracy is appointed to be 0.0023 for MW-level SPS, while the beam collection efficiency loss is less than 1% because of microwave power beam steering error. This parameter should be adopted as a key design reference in MPT system for MW-level SPS.

Calibration Tests on a New Thin-film Thermopile Heat-flux Sensor

YANG Kai, YANG Qing-tao, ZHU Xin-xin, WANG Hui, LIU Jian-hua, ZHU Tao

2018, 38(3):  67-72.  doi:10.12060/j.issn.1000-7202.2018.03.11

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A new thin-film thermopile heat-flux sensor is fabricated with heat-sink bulk to meet the measuring demands of long time, high frequency-response and high heat-flux density. And the transfer calibration method with radiant heat source is applied to calibrate thin-film thermopile heat-flux sensors for sensitivity coefficients. The calibration results show that sensitivity coefficients of the thin-film thermopile heat-flux sensors are dependent on surface temperatures, and the correction function is a quadratic polynomial, which is different from original linear one, when the surface temperature is higher than some value. The reasons for the difference are tempera-ture-dependent thermal conductivity of thin-film thermal resistance layers and Seebeck coefficient of thin-film thermocouples. Calibration tests and analytical results provide reference examples for calibrating and redesigning the thin-film thermopile heat-flux sensors, and the measured heat-flux density data is accurate and reliable when the calibrated sensors are used in practice.

Discussion on Management of the Metrological Technical #br# Specification for National Defense Science & Technology Industry#br# under the New Situation

WU Qian, HU Yi-fei, JIANG Xiao-yong, FENG Ying-qiang, DU Xiao-shuang, DENG Mo-han

2018, 38(3):  73-77.  doi:10.12060/j.issn.1000-7202.2018.03.12

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The metrological technical specifications of National Defense Science & Technology Industry play an important role in ensuring the unification of measurement units, measurement equipment controlled and accurate measurement data in research and production of weapons. In accordance with law the National Defense Science & Technology Industry system gradually standardizes management of metrological technical specifications, unifies code numbers, teases system, carries out formulation, while value transfer and value trace is guaranteed to put smoothly. In the future the National Defense Science & Technology Industry system will enhance the whole process management of metrological technical specification, draw up metrological technical specifications in aspect such as extreme value, dynamic state, special environment condition, bring the national metrological technical specification that satisfies requests into the metrological technical specification system of the National Defense Science & Technology Industry, revise or abolish the metrological technical specification that dissatisfied value transfer demand.

Development Status and Suggestions of Internet Plus Measurement

LIU Yan, YIN Zhao-hui, LI Yuan, LI Hao-yue, YANG Rui-ya

2018, 38(3):  78-83.  doi:10.12060/j.issn.1000-7202.2018.03.13

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The status and existing problems of domestic measurement and testing industry are analyzed. The preliminary exploration of Internet plus measurement ser??vice model is described. It is pointed out that Internet plus measurement is an inevita??ble development trend in the field of measurement and testing in the future. The meas??ures and suggestions that setting up the correct internet thinking, strengthen the re??search and application of internet plus measurement model, strengthen the industry integration, improve the ability to provide system services to users are propounded.

Discussion on the Application of Big Data Technology in Aerospace#br# Product Quality Management

LIU Rong

2018, 38(3):  84-88.  doi:10.12060/j.issn.1000-7202.2018.03.14

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Based on study of the quality management of military trade product, this paper describes the application and analysis of big data technology in aerospace product quality management, demonstrates the preliminary application of big data technology in production process management and data analysis, and presents advices for the quality management with big data technology.