Table of Content

15 October 2013, Volume 33 Issue 5

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Measurement Technique of Terahertz Pulses and Application in Metrology

GONG Peng-wei；XIE Wen；JIANG He；MA Hong-mei；YANG Chun-tao

2013, 33(5):  1-8.  doi:10.12060/j.issn.1000-7202.2013.05.01

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Recent development of generation and measurement technique of terahertz pulses have been reviewed in this paper. Detailed instructions also show for generation and measurement technique of terahertz pulses as well as their merits and drawbacks. And the application of terahertz pulses technology in metrology have been given, such as wide bandwitdh osscilloscope, ultrafast photodetector, ultrafast pulse generator, wide bandwidth comb generator and so on.

Research on the Key Technologies for Applications of DRFM in Simulating Altitude Signal

LI Shang-sheng；ZHANG Jun；CHEN Jia-lin

2013, 33(5):  9-11.  doi:10.12060/j.issn.1000-7202.2013.05.02

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The way to simulate the altitude signal for radio altimeter is discussed in the paper. Because the DRFM can copy the fine characteristic of signal, it can be used to simulate the altitude signal which the altitude volume can be adjusted continuously and the jamming signal can be added to it. As important, many key technologies are discussed in the paper, such as dater cyclic storage technologies, digital noise modulation technologies and false target interference signal technologies etc.

Investigation on the Measurement of Complex Permittivity of Substrate of Microwave Printed Circuit Board

BU Ling-hui；XIANG Bo；DOU Wen-bin

2013, 33(5):  12-18.  doi:10.12060/j.issn.1000-7202.2013.05.03

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In this paper the measurement of complex permittivity of substrate of microwave printed circuit board are investigated. Vector network analyzer (VNA) is used, and strip lines matched with coaxial line port are used as the structure to be measure. The information of complex permittivity of the strip line is included in the characteristic impendence and complex propagation constant of the strip line, which can be obtained from ABCD matrix. S parameters of the strip line can be measured by VNA, and they can be transformed into ABCD matrix, then the complex permittivity of the substrate can be obtained. To get correct results, the measurement system have to be calibrated. Here a calibration method result from TRL calibration principle is used.

Explore on Calibration Technology of Automatic Tuner

WU Ai-hua；LIU Chen；LUAN Peng；SUN Xiao-ying；LIANG Fa-guo；ZHENG Yan-qiu

2013, 33(5):  19-22.  doi:10.12060/j.issn.1000-7202.2013.05.04

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Automatic tuner is widely used more and more in the microelectronics industry, But there are no such measurement institutions to carry out the calibration work of tuner. This paper describes the mechanical structure, working principle and design of the control model, set up a calibration system to achieve calibration work of the main parameter vector repeatability, VSWR and insertion loss.

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

2013, 33(5):  23-26.  doi:10.12060/j.issn.1000-7202.2013.05.05

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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.

Digital Communication System’s SNR Parameter Measurement Method Comparison

XIA Wei；DING Feng-hai；QIU Bin；YU Qing-hua

2013, 33(5):  27-30.  doi:10.12060/j.issn.1000-7202.2013.05.06

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This article discusses three measurement methods of the digital communication system’s SNR parameter, namely power measurement, power spectral density measurements and vector analysis, describe the measurement principles and methods of SNR, and through specific measurement experiment compared above measurement’s advantages and disadvantages, measurement methods discussed in this article has guiding significance for engineering applications.

RE102 Test Solutions for the Electromagnetic Emissions of the Millitary Equipments

YANG Ye；ZHANG Chun-yan；NIU Yan

2013, 33(5):  31-33.  doi:10.12060/j.issn.1000-7202.2013.05.07

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EMC aims to ensure that equipment items or systems will not interfere with or prevent each other's correct operation through spurious emission and absorption of EMI. EMS ensures the correct operation, in the same electromagnetic environment, of different equipment items which use or respond to electromagnetic phenomena, and the avoidance of any interference effects. This paper gives a detailed implementation on the GJB 152A- 97 RE102 test.

Application and Discussion of High Accuracy Time-Frequency in Space Science & Technology

SU Jian-feng；YIN Dong-mei

2013, 33(5):  34-38.  doi:10.12060/j.issn.1000-7202.2013.05.08

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Since after 1950s, atomic frequency standards appeared, greatly promoted the development of science & technology, along with the development of atomic frequency standards, high-precision time-frequency information in   space science &technology played an important role. This article describes the application prospects of the high-precision time-frequency in space science, fundamental physics and satellite navigation technology, and preliminary discusses high-precision time-frequency of ongoing programs, carrying out scientific and applied research, and Pulsar time in space science & technology in foreign countries. Finally, it takes out some recommendations for high-precision time-frequency in space scientific& technological research.

The Ground Test System Designed for SpaceBorne Application

HUANG Xin-xin；SHENG Li-yuan；FENG Xu-zhe

2013, 33(5):  39-42.  doi:10.12060/j.issn.1000-7202.2013.05.09

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Inter-satellite data transmission system requires space-borne equipment with real-time data transmission, high accuracy, and the data transfer process must remain beat sync.Space-borne equipment related must conduct rigorous pre-launch data stream tests to ensure meet the requirements, so building data stream test system on the ground has great significance.This paper makes the secondary development based on 1553B bus simulation card and completes the design of ground testing system. The test results for related space-borne equipment show that this system has realized several kinds of transmission mode with 1553B bus, such as BC-RT (Bus Controller-Remote Terminal), RT-BC (Remote Terminal-Bus Controller), RT-RT, MT (Monitoring Terminal), and completed the transmitting procedure with given amount of data during the limited period. In a word, the system designed in this paper satisfies the tempo synchronous for data transmission and completes the data stream testing for the relevant space-borne equipment. The system can not only meet the test requirements for related space-borne equipments, but also can be regard as a general platform for the data stream testing and thus provides data level test method with 1553B bus.

Realization of GPS Carrier Phase Time Transfer Software

YUAN Yuan；ZHONG Chong-xia；ZHANG Sheng-kang

2013, 33(5):  43-47.  doi:10.12060/j.issn.1000-7202.2013.05.10

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The mathematical model and the data processing algorithm of GPS carrier phase time transfer based on Precise Point Positioning (PPP) are discussed in the paper. The program flow GPS carrier phase time transfer is designed. The application software is developed using Visual C++ and FORTRAN, which is named as GPSCPTT V1.0. Large amount of raw observations are used to validate the software, which shows that it could get a quite good performance in time transfer.

Frequency Standard Source based on the Beidou Satellite System

ZHOU De-hai

2013, 33(5):  48-51.  doi:10.12060/j.issn.1000-7202.2013.05.11

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The paper is based on testing, analysis and study of 1 PPS signal of Beidou second generation navigation positioning receiver output. Using the method of combing digital filter and voltage integral control, filters out interference in the process of signal transfer, make it output relatively stable 1 PPS signal to tame rubidium atomic frequency standard. It studies the model that Beidou receiver tames the rubidium atomic frequency standard. It uses some advanced technology, such as precision time interval measurement, high precision digital phase, computer automatic control, completes the tracking control rubidium atomic frequency standard, to realize the same accuracy time-frequency signal output which is equal to satelliteborne rubidium clock. It develops a set of Beidou receiver tames the rubidium atomic frequency standard, which is portable and high cost performance, and can provide the on-site measurement technical support, also can realize remote calibration and verification for frequency standard.

The Key Technology Research of 1553B Bus Data Flow Interface of Satellite

LIU Yan-song；SHEN Li-yuan；FENG Xu-zhe

2013, 33(5):  52-56.  doi:10.12060/j.issn.1000-7202.2013.05.12

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The realization of data bus interface of satellite load plays a vital role in the load flow of information transmission system, designing a reasonable data flow management scheme is vital for the normal communication between the satellite loads. MIL-STD-1553B bus has higher data transfer rate, real-time character, reasonable error control measures and special mode command, which is appropriate to the requirements of satellite because of its special environment and large amount of data transmission tasks. This paper configures the 1553B bus mode of satellite load through dragon chip and designs the data stream transmission form to realize the data bus interface of 1553B bus data flow.Test results show that, data interface has high reliability and effective practical application which meets the design requirements for satellite communication.

Mode-Coupled All-Fiber Transfer Standard Manufacture for Polarization Mode Dispersion

WANG Heng-fei；CHEN Kun-feng；YING Cheng-ping；WU Bin

2013, 33(5):  57-61.  doi:10.12060/j.issn.1000-7202.2013.05.13

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Polarization mode dispersion (PMD) is one of the key problems that must be solved for developing the high-speed fiber communication. It is difficult to calibrate PMD measurement instruments accurately because of the remarkable statistical characteristic of the PMD. As an ideal mode-coupled transfer standard, the wave-plate stack has been applied by many famous organizations. But it is difficult to manufacture the wave-plate stack, besides, it’s also very expensive. These factors form the block of the applications and popularizations of the wave-plate stack. We propose a method on the fabrication of an all-fiber mode-coupled transfer standard in this paper. The stability of this transfer standard is 0.5%, which is comparable with the wave-plate stack. This stability is 1~2 orders’ higher than the ordinary fiber transfer standard. In addition, it is also easily realized and has the advantage of low cost.

Quasi-monoenergetic Neutron Reference Fields with Energies from 20 MeV to 400 MeV

LI Chun-juan；CHEN Jun；WANG Zhi-qiang；LIU Yi-na；LI Wei；ZHANG Wei-hua

2013, 33(5):  62-67.  doi:10.12060/j.issn.1000-7202.2013.05.14

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Quasi-monoenergetic reference neutron beams in the energy above 20 MeV have to be produced to satisfied the calibration for the response of the neutron detectors for the neutron field with high energy. The current status of the quasi-monoenergetic neutron reference fields in the energy range from 20 MeV to 400 MeV and the way how they were established were survyed on and reported in this paper, the reaction 7Li(p, n)7Be can be used as the quasi-monoenergetic neutron source in this energy range, the neutron beam profile can be measured with converter and imaging plate, the energy spectrum can be measured with organic liquid scintillation detector or the 238U fission chamber by TOF method, and the proton recoil telescope can be established as the primary instrument in this range.

Review of Measurement Lechnique for Dosimetry in Space

LIU Yi-na；YE Hong-sheng；LI Wei；ZHANG Wei-hua；LI Chun-juan

2013, 33(5):  68-73.  doi:10.12060/j.issn.1000-7202.2013.05.15

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Instruments for dosimetry in space radiation environment are introduced briefly. Passive detectors mentioned include luminescent, tracketch, nuclear emulsion, metal foil detectors, bubble detectors and MOSFET dosimeters. Active detectors include silicon semiconductor mainly Liulin-4, silicon telescope including DOSTEL, RRMD,Liulin-5 and CPDS, gas filled detectors including TEPC and R-16 ion chamber, neutron spectrometry including bonner ball spectrometry and phoswich spectrometry. Various instruments and methods are complementary and provide reliable data for space radiation dosimetry.

Metrological Guarantee Research on Special Testing Equipment

SONG Guo-jun；LI Bing；YU Bo

2013, 33(5):  74-78.  doi:10.12060/j.issn.1000-7202.2013.05.16

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The statutes of special testing equipment is studied according as statutes and standards,sum up the requirements and principle of special testing equipment’s sorts,and the requirements of metrological guarantee include of scheme,development,acceptance,use，in the end,the metrological guarantee on special testing equipment have been proposed.