Table of Content

15 February 2013, Volume 33 Issue 1

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The Application of Bias Power Matcher in the 8mm Band for the Microwave Small Power Calibration System

ZHU Jun；YU Meng；LI Jian-yi；CHEN Zhi-yu

2013, 33(1):  1-3.  doi:10.12060/j.issn.1000-7202.2013.01.01

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In order to improve measurement accuracy of the microwave small power sensor In the 8mm wave band, The new microwave power calibration system based on low reflectance equivalent signal generator was made up through present systemⅡ calibration system and bias power matcher. This paper recounted design and working principle of bias power matcher. The system has virtues on conveniences and stability and accuracy.

Research on a Novel Bilayer Substrate Butler Matrix

DING Ke-jia；HE Fei；LV Shan-wei；XIONG Xiao-jun

2013, 33(1):  4-9.  doi:10.12060/j.issn.1000-7202.2013.01.02

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A kind of novel 8×8 Butler matrix based on multilayer substrate structure is presented and realized. A bilayer substrate structure is adopted to distribute components into the up and down layer to replace crossover. Two approximate λ_g/8 stepped coupling microstrip Schiffman phase shifter is used to realize wideband phase shift. A threebranch line coupler is employed as wideband bridge. An 8×8 Butler matrix sample working in C band frequency is designed and fabricated. The measured results indicate that in the frequency range over (4.2~5.3) GHz, the return loss of each port is better than -10dB, the isolation is better than 17dB, the distribution error is less than ±1dB, the phase error is less than ±12° and the measured average insert loss is about 2.5dB. Compared with conventional structure with crossover, the novel Butler matrix has lower loss and better adaptability to large scale multibeam forming network.

Design and Realization of the Low Frequency Comprehensive Test Instrument

WANG Xi-dong；ZHANG Lei；MU A-hua

2013, 33(1):  10-14.  doi:10.12060/j.issn.1000-7202.2013.01.03

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The groundwork and approach in its implementation of low frequency comprehensive test instrument were presented. The instrument uses touch monitor to finish the signal distortion, phase difference measurement and weak signal detection. The instrument designed base on the virtual instrumentation idea, and it has he characteristics of simple operating, easy carrying and accurate measuring.

Review of Calibration Techniques for Two Way Satellite Time and Frequency Transfer System

ZHANG Sheng-kang1，2；WANG Xue-yun1；WANG Hong-bo1，2 ；YANG Jun1，2

2013, 33(1):  15-22.  doi:10.12060/j.issn.1000-7202.2013.01.04

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Two way satellite time and frequency transfer technique is a fundamental means of high precise time and frequency comparison, with which A type uncertainty is about 0.1ns in time comparison. The B type uncertainty is mainly relies on the system calibration. In this article, the principals of two way satellite time and frequency transfer is firstly review. Then various existing techniques and devices for TWSTFT calibration are presented in detail. Their performances and characteristics are compared and reviewed. The development of the calibration is concluded and the future trend is discussed.

Research on the Dispersion of CPA Laser System

ZHAO Huan

2013, 33(1):  23-30.  doi:10.12060/j.issn.1000-7202.2013.01.05

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The role of dispersion in femtosecond Ti: sapphire CPA system is theoretically analyzed. Based on the analysis, we simulate the stretch-recompress process with glass stretcher and double-prisms pairs compressor, which supply an optimized guide in the construction of CPA laser system. Compared to the grate stretcher, the positive dispersion of glass is less, but for preamplifier, the glass stretcher is more economical and with better maneuverability. Choosing appropriate glass material and changing the inserted length of prism pairs, or further adding grate pairs and chirped mirrors, the high order dispersion could be compensated and the pulse width compressed shorter.

A Disciplined Rubidium Oscillator for Timing Application

CHEN Zhi-yong；HAN Di；QING Yi；DONG Ke；TANG Chao；SHENG Rong-wu

2013, 33(1):  31-35.  doi:10.12060/j.issn.1000-7202.2013.01.06

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A GPS disciplined rubidium oscillator is designed for timing application. After disciplined, the rubidium oscillator outputs a second signal which is real-time synchronized to the second signal of the GPS receiver. In the same time, the time difference between the rubidium oscillator and the GPS receiver is processed to calibrate the frequency of the rubidium oscillator through a PI controller. The time difference is less than 10ns，the frequency difference is less than 1E-12/day between two GPS disciplined rubidium oscillator.After a dedicated GPS signal processing board and a particular GPS receiver is used, the time difference can be limited to 5ns.

Comparison and Analysis of the Methods to Measure the Frequency Stability

JIAO Yue；ZHANG Sheng-kang

2013, 33(1):  35-38.  doi:10.12060/j.issn.1000-7202.2013.01.07

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As a main aspect to measure the performance of the frequency standards, the frequency stability plays an important role in evaluating the stability and reliability of the products. It usually takes a long time to compute the traditional Allan variance for measuring the long-term stability of the frequency standards. In this paper, Total variance, Thêo1 and ThêoH are studied, which can reduce the measuring time in time domain stability analysis comparing with the traditional Allan variance; then, based on the time error data of a Rubidium (Rb) clock measured in the laboratory, these variances are compared and analyzed.

Application of Digital-to-analog DAC1220 in the Disciplined Clock

SU Jian-feng；YIN Dong-mei

2013, 33(1):  39-42.  doi:10.12060/j.issn.1000-7202.2013.01.08

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In GPS disciplined clock system,in order to calibrated the frequency of VCOCXO, It is necessary to transfer control digital calculated by CPU to corresponding anolog voltage.the paper discussed the principle and application of DAC1220 converter,and expatiates the relationship between the DA converter resolution and frequency calibration of disciplined clock.

Study on the Testing Method of Precise Time and Frequency  for COMPASS/GNSS User Terminals

SUN Hai-yan；XIE Yan-min；HU Yang；CHEN Hong-qing

2013, 33(1):  43-48.  doi:10.12060/j.issn.1000-7202.2013.01.09

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It has been discussed this paper that the testing and calibrating means on precise time and frequency for the user terminals of COMPASS / GNSS navigation system, based on Virtual Instrument technology, on network technology and on batch measurement technology. It is put forward that the testing method based on modulization and on VXI / PXI / LXI bus technology, with the consistency design of standard time and frequency reference signals and the design of remote testing and calibrating based on network technology. At the same time, it is proposed that the structure design and it’s application of COMPASS / GNSS precise time and frequency testing and calibrating system. This way can upgrade the measuring level of COMPASS / GNSS time and frequency terminals with integration and intelligence.

Algorithm of Complex Number in the Impedance Measurement

ZHANG Ruo-lin；LIU Min

2013, 33(1):  49-52.  doi:10.12060/j.issn.1000-7202.2013.01.10

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The paper introduces a kind of complex number calculations tool，Excel .Compared with other tools, such as Matlab and Labview, Excel is expediently to operate, easy to provide control interfaces, abundant functions, and suitable for non-programmer to calculate complex number. In order to solve the problems presented in the open/short compensation during impedance measurement, a method for the open and short compensation of using Microsoft Excel 2007 is provided. This method is easy to learn, which is without fussy program. It is possible to spread the method in the following years.

Research the Metrological Raceability of Susceptometer

ZHOU Ying

2013, 33(1):  53-57.  doi:10.12060/j.issn.1000-7202.2013.01.11

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The paper put forward calibration method of susceptometr from a point of the theory of uncertainty through the analysis of susceptometor’s theory and the trace method of the susceptibility and the polarization. It prepared for the transferability and traceability analysis of susceptometer.

Result Analysis of the First Comparison Experiment for the High Capacitance Standard

LI Ya-lu；LIU Min；JIN Pan；LIU You-wan；XIE Rui-hua

2013, 33(1):  58-61.  doi:10.12060/j.issn.1000-7202.2013.01.12

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The traceability of capacitance above 1μF is difficult to solve. In order to ensure the uniformity, reliability and accuracy of high capacitance parameter in national defense metrology system.Four calibration laboratories, for the first time, participate the (10μF~10mF)/100Hz high capacitance comparison experiment, organized by Beijing Orient Institute of Metrology and Test, which obtains valuable data. The paper publishes the experiment results, and further analysis the data shared by four laboratories. The weighted arithmetic means of four laboratories measurement results are reference value of the comparison experiment, the weighting factors are proportional to reciprocal square of uncertainty declared by each laboratory.

A Measurement for Dual-axis Magnetic Sensor Orthogonality without Axis Alignment

LI Wei；TONG Wei-ping

2013, 33(1):  62-65.  doi:10.12060/j.issn.1000-7202.2013.01.13

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An Automatic method which called orthogonal magnetic field measurement for dual-axis magnetic sensor orthogonality measurement in compass manufacture is presented. The proposed method could be easily realized, no minutely operation and no manual assemble is required. Test result indicates that orthogonal magnetic field measurement could attain the orthogonality faster than vector projecting method.

An Auto-measurement for Isolation Amplifier based on LabVIEW

ZHANG Cong；XIAO Yi；CHEN Xin

2013, 33(1):  66-69.  doi:10.12060/j.issn.1000-7202.2013.01.14

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Isolation amplifier has the function of electric isolation between input circuit and output circuit. It usually uses transformer or light coupling to transfer signal. Nonlinear error is an important performance of technology. In the paper, an automeasurement system for isolation amplifier is introduced that is based on LabVIEW. In this system signal source and digit multi-meter are used as the standard, and they are connected with a computer by GPIB or TCPIP cables. It completes the numeration of nonlinear error, and builds the report automatically. Then some details about the theory, composing, arithmetic and software is introduced. Now this system has been used in work effectively, which is rewarding attempt for testing job.

Design of the Control and Telemeter Device of Towed Target based on COTS

TIAN Xin-feng；SUN Hai-tao；CHEN Xi

2013, 33(1):  70-74.  doi:10.12060/j.issn.1000-7202.2013.01.15

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The control and telemeter device of towed target is designed based on COTS to meet the requirements of multi-function, high quality, small mess, small scale, low-power and low cost. Its hardware platform is constructed on the base of PC/104 and the unit of CPU, I/O, GPS, data transceiver, and power supply are typeselected. The function of instruction collection and display, instruction fault tolerance, real-time large quantity data receiving and saving and data download and program install are realized on the base of commercial DOS operating system. The ISR and multi-grade-buffer are used to make the system work properly. The experiments show that the system functions perfectly and it meets the design and appliance requirements of the control and telemeter device of towed target.

Research on the Improvement of the Storage Battery Loopback Detection Equipment Reliability

ZHANG Hao；ZHOU Xiao-ping；XIAO Yi

2013, 33(1):  75-78.  doi:10.12060/j.issn.1000-7202.2013.01.16

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Aimed at the failure which happenned in the reliability experiment of the storage battery circuit detection equipment, this article bring forward three reliability improvement measure on the experiment. Actually, by the method of watching timer and soft antijamming, the reliability of the storage battery circuit detection equipment has been enhanced. In addition, this article discuss other method which can be used to improve the reliability of the experiment.