Table of Content

15 June 2015, Volume 35 Issue 3

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Impact Study on S Parameters of Conical Coaxial Line using Impedance Gradient Matching Section

LIU Xing-xun；ZHANG Tao

2015, 35(3):  1-4.  doi:10.12060/j.issn.1000-7202.2015.03.01

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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.

Research on the Technology of Generating the Echo Signal for High-resolution Radar

LI Shang-sheng；FU Zhe-quan；MO Lu

2015, 35(3):  5-9.  doi:10.12060/j.issn.1000-7202.2015.03.02

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This paper introduces a way to imitate the echo of target by high-resolution radar. Because the echo of target by this way can not only take the feature information of the target, but also subtle feature of the radar transmit signal. We can fulfil the demand of proceeding performance test of high-resolution radar in laboratory standard.

Waveguide-to-microstrip Antipodal Finline Transition Design of W Band

SUN Jing；LIANG Fa-guo；HAN Li-hua；SUN Xiao-ying；ZHENG Yan-qiu

2015, 35(3):  10-13.  doi:10.12060/j.issn.1000-7202.2015.03.03

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This paper researched the waveguide-to-microstrip antipodal finline transition at W band, analyzed and simulated antipodal finline transition of Cosine-squared taper function curve and flexible spline curve, designed and fabricated an spline curve antipodal finline transition of backtoback structure. The measured results show that the insertion loss is less than 1.3dB, and the return loss is less than -13dB in whole W band, the insertion loss of a single transition is less than 1.0dB, and the return loss is less than -20dB in (90~99)GHz, achieve good performance.

Research on the Calibration Method of Echo Simulator for Synthetic Aperture Radar

LIU Li-juan；LI Xiu-hua

2015, 35(3):  14-19.  doi:10.12060/j.issn.1000-7202.2015.03.04

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Because of the shortage of image about echo simulator for Synthetic Aperture Radar, a method for measuring image parameters of radar signal is presented. According to this method, a set of device for simulator for radar scene image echo calibration is established. The paper includes some useful processing methods which realize the calibration of the image, such as quadrature demodulation, pulse compressing, image algorithm， filter algorithm and so on.

Research on the Calibration Method for XH3596 Series of Frequency Stability Tester

CHEN Yan-hong；SHI Yan

2015, 35(3):  20-25.  doi:10.12060/j.issn.1000-7202.2015.03.05

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A calibration method of XH3596 series of frequency stability tester without doubling output is introduced. By analyzing the structure and working principle of XH3596 series of frequency stability tester, using the internal counting unit instead of the external counter, presetting the frequency difference of measured signal and reference signal from the input port, comparing with the numerical value and measured numerical value, the calibration problem of XH3596 series of frequency stability tester metrological characteristic has been solved. And the evaluation of uncertainty in measurement for sensitivity and maximum relative frequency difference have been given. Because of this paper, the gaps of Nation Regulation of Metrology Verification of P.R.C and Calibration Specification have been filled, and it also provides reference calibration for other the similar principle of frequency comparator.

The Design and Implementation of Automatic Monitoring System for Time and Frequency Equipment

YUAN Yuan；ZHOU You；WANG Liang；WANG Chao；DU Xiao-shuang

2015, 35(3):  26-31.  doi:10.12060/j.issn.1000-7202.2015.03.06

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According to the demand for equipment realtime monitoring management of the time and frequency laboratory,a automatic monitoring system for time and frequency equipment is constructed,which combined C++ language and Microsoft SQL server database technology in the Microsoft NET platform.The system could supervise the realtime status of time and frequency equipment. The system could also set the parameters over IP net andend the alarm information when the equipment appears abnormal status.The practical application shows that the system has good usability and maintainability,and provides guarantee for the orderly running of the time and frequency laboratory.

A Delay Calibration Method based on Portable Station for Two-way Satellite Time and Frequency Transfer System

WANG Mao-lei1,2；XIAO Sheng-hong1；ZHANG Da1；YU Jin1

2015, 35(3):  32-35.  doi:10.12060/j.issn.1000-7202.2015.03.07

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Device delay is the main error source in two-way satellite time and frequency transfer system. It is crucial to calibrate the delay in order to achieve highly accurate time comparison. According to the principle of two-way satellite time and frequency transfer, delay calibration based on portable station is introduced for two way satellite time frequency transfer system. In the engineering practice, due to the limit of reality, the method of calibration is modified, and the device delay of two-way satellite time and frequency transfer system is calibrated based on this method.

Optimization of Digital Circuits for Miniature CPT Atomic Clock

ZHANG Xu；ZHANG Zhen-wei；WANG Dong；YANG Ren-fu；NIAN Feng

2015, 35(3):  36-39.  doi:10.12060/j.issn.1000-7202.2015.03.08

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Coherent Population Trapping (CPT) atomic clock is a new type of atomic clock with low-power, small volume and excellent stability. In this paper, to optimize the digital filtering algorithm of miniature CPT atomic clock, we use Cascade Integrator Comb (CIC) filter as the front filter and low order FIR filter as the end filter. In the case of the same noise suppression radio, new filtering module has saved logic resources and reduced power consumption. Based on the above design, the filtering module reaches the filtering effect of 55dB and saves about 42% of FPGA logic resources.

A Device used for Calibrating the Electrical Characteristics of Space Battery in Different Acceleration

GUO Miao；WANG Bin

2015, 35(3):  40-43.  doi:10.12060/j.issn.1000-7202.2015.03.09

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Before the aircraft launch, a series of tests should be carried out to the space batteries. However the environment on earth is quite different from in space, especially the weightlessness in space which it is difficult to simulate for a long period of time on earth, in order to achieve the purpose of the test. So the test data got on the ground may be different with the actual data. Thus, we invent a kind of calibration device which calibrate space battery for electrical properties under different acceleration.

The Method of Calculating Solar Energy on the Aerocraft

LIANG Jun；LI Hai-wei；OU Lian-jun；YANG You-chao；XU Hai-yun

2015, 35(3):  44-47.  doi:10.12060/j.issn.1000-7202.2015.03.10

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The representative power system of aerocraft was introduced.All kinds of parameters，which impacted production of soalr energy, were analyzed.The method of calculating solar energy on the aerocraft was provided,which included from the power to the area of the solar array and from area of the solar array to the producing power.The effect of accurately calculating solar energy was achieved.The problem,which the power parameters for the aerocraft were difficult to realize due to error of estimate in macro loop design,was solved.

Development of the Transfer Standard of Near Infrared Absolute Spectral Response

LIU Yu-long；LIU Chang-ming；SHI Xue-shun；CHEN Zhen-lin；LI Jian-jun

2015, 35(3):  48-54.  doi:10.12060/j.issn.1000-7202.2015.03.11

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In optical radiation measurement, trap detection technology is an important detecting technology，and the trap detector is a major methods of keeping and transferring optical radiation power benchmark value. InGaAs trap detector is often as optical radiation transfer standard in 900nm to 1 700nm. In view of the requirements of dissemination in the near infrared band, InGaAs trap detector is developed by the trap detection technology, and the performance test was performed in this article. Test results show: the absolute spectral response rate of the trap detector was 0.709 8A/W at 1 064nm, and the uncertainty of measurement is 0.1%; The nonlinear index of the spectral response is better than 0.999 93 within the 0.1mW~3mW; The non stability of the measurement results is better than 0.004 95% in an hour; The spatial heterogeneity of the trap detector is better than 0.05%, All performance parameters from the tests meet the technical requirements as a transfer standard.

Design of Single-photon Detector Quantum Efficiency Measurement and Control Software based on LabVIEW

CHEN Hai-dong；SHI Xue-shun；ZHAO Kun；LIU Chang-ming

2015, 35(3):  55-60.  doi:10.12060/j.issn.1000-7202.2015.03.12

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The principle and experiment system of single-photon detector quantum efficiency measurement by correlated photons are introduced, and a set of measurement and control software for the system is established and developed. Based on LabVIEW standard state machine, the software is consist of “laser configuration”, “coincidence measurement” and “generate report”, etc. branches, which was wrote with VISA, ActiveX and report generation toolkit. State machine switches its branches to call each function program. The actual applications show that, the software, with a friendly interface and a high dependability, is able to use for singlephoton detector quantum efficiency measurement.

Research on Low-frequency Electric Connector Test Method

LIU Zhao-yun1；DAI Fei2

2015, 35(3):  61-65.  doi:10.12060/j.issn.1000-7202.2015.03.13

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In light of characteristics of electric connector used in weapon system and higher requirement of its reliability in bad environment, This paper researches on testing method of low-frequency electric connector used in weapon system. One test method of the electric connector’s appearance and properties is analyzed and summarized.A reference for electric connector test method and decision criteria is provided in this paper.

Discussion on Design of Various Mediums Gas Micro-flow Standards

WANG Jun-tao；SANG Pei-yong；XIN Yan-feng；BU Qing-juan；JIA Zheng-hong

2015, 35(3):  66-70.  doi:10.12060/j.issn.1000-7202.2015.03.14

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Introduced the development of gas flow metering characteristics and needs, proposed the establishment of a various mediums micro gas flow calibration facility. Device indicators proposed by the actual needs demand. Analysis and comparison of characteristics and principles of commonly used gas flow standard, determining principle of PVTt. According to the design specifications and principle preliminary designed the proposal, and given analysis of the uncertainty.

The Application of Portable and Multi-purpose Calibrating Instrument in the Field Calibration of Specialized Test Equipment

HUANG Meng；ZHANG Han-wen

2015, 35(3):  71-75.  doi:10.12060/j.issn.1000-7202.2015.03.15

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Specialized test equipment (STE) for aerospace product should be accurate, reliable and traceable, and it is recognized by both STE manufacturers and users.  Five traditional methods for calibrating STE are described. Because most STE have characteristics of operating complexity, excessive parameters and bad mobility, traditional STE calibrating methods are complicated, low efficient and expensive. A new method that portable and multifunctional calibrating instrument is applied to the field STE calibrating is introduced, and it is proved by two cases. At last uncertainty of the new STE calibrating method is analyzed.

Design and Implementation of UAV′s Simulator based on VxWorks

XUE Yan-feng；XUE Peng

2015, 35(3):  76-80.  doi:10.12060/j.issn.1000-7202.2015.03.16

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UAV simulator is a set of ground support equipment, used to flying Cooperative training and testing of ground control device. The device achieved by simulation of electrical interface and logic relation between of UAV and ground control device, and it also can simulate the whole process of air flight of UAV. The equipment adopts the embedded computer, which uses CPCI bus structure and VxWorks operating system. It has the function of serial communication and UDP network communication, and of graphic human-machine interface.