Table of Content

15 June 2013, Volume 33 Issue 3

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Review on Developments of High-power Microwave Measurement and Calibration

FANG Wei-hai；WEN Xin；ZHANG Lu；NIAN Feng；YANG Chun-tao；CHEN Yun-mei

2013, 33(3):  1-6.  doi:10.12060/j.issn.1000-7202.2013.03.01

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Recent development of high-power microwave measurement and calibration have been given in this paper. Detailed introductions also show for typical measurement methods as well as their merits and drawbacks. New method named cascade couplers technique for the measurement of high-power microwave has been proposed which has the merits of accuracy, reliability, traceability, real-time and multiparameters measurement.

Review on  the Key Technology of MMW Wideband Phased Array Seeker

WANG Lian；DONG Sheng-bo；WANG Xiu-jun；YI Xiao-li

2013, 33(3):  7-10.  doi:10.12060/j.issn.1000-7202.2013.03.02

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Now, the research on the MMW wideband phased radar seeker technology is very hot in many countries. The radar seeker’s deterrent force depends on its abilities of agility, long distance detection, precision guidance, and multi-target detecting. The MMW wideband phased radar seeker has agile beam scanning, can tracking the target precisely with the MMW imaging technology; also because of the active phased array, the seeker can get more controlled power to increase the detection distance and tracking multi-targets simultaneously. This paper firstly analyses the research status and the advantages of the MMW wideband phased radar seeker technology, then on the basis of the analysis, mainly in this article the technologies of the active array antenna, the MMW wideband imaging, the space-time adaptive processing, the multi-target detecting and tracking and so on are discussed.

Research and Implement of Transparent Clock based on IEEE1588v2

CHEN Jin-feng；HUA Yu；SUN Zhong-wei

2013, 33(3):  11-16.  doi:10.12060/j.issn.1000-7202.2013.03.03

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The synchronous packet transmits lends to the problem of asymmetry packet queuing delays and delay jitter by ethernet switch. This problem has a significant impact on IEEE1588 time synchronization precision. To solve it， transparent clock is defined by the IEEE1588v2.In this paper, we introduce transparent clock of IEEE1588v2, proposing a implement scheme of transparent clock based on transparent clock’s principle and model, creating a supporting IEEE1588 ethernet switch with transparent clock. To verify the function of transparent clock, an experimental setup that was analogous to a practical environment. The experiment test results demonstrate that this device efficiently solve the problem of asymmetry packet queuing delays and delay jitter in the condition of different network traffic and the time synchronization precision is at nanosecond level.

Research on Key Techniques of High Dynamic GPS and BD2 Integrated Navigation Signal Simulator

WANG Hai-feng；ZHANG Sheng-kang；WANG Hong-bo；ZHONG Chong-xia

2013, 33(3):  17-22.  doi:10.12060/j.issn.1000-7202.2013.03.04

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High dynamic GPS and BD2 integrated navigation signal simulator is an efficient platform for design and validation of a high dynamic GPS and BD2 integrated navigation receiver. In this paper, we provide the technical framework and implementation about the key part of the GPS and BD2 integrated navigation signal simulator. And we mainly focus on the research of the generation of high dynamic signal, using cubic spline interpolation algorithm to reduce the amount of computation about the simulator, anti-SINC compensation filter design and a method to guarantee the coherence between channels of the simulator. Finally, the validation of the GNSS signal from this simulator is made.

Modeling and Simulation of BPM Time Service Signal Transmission Loss

GUO Mei-jun；HUA Yu；GAO Yuan-yuan；LU Rui-yong

2013, 33(3):  23-27.  doi:10.12060/j.issn.1000-7202.2013.03.05

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In order to complete the upgrade of the BPM broadcasting system, it needs to monitor the field strength of BPM signal in far field. Therefore, it is necessary to research the transmission loss of the radio channel and construct an appropriate model. On the basis of analyzing the transmission loss model, both the influences of sky wave and ground wave on BPM signal are taken into account. The software developed in Labwindows/CVI is designed to calculate the field strength of BPM signal in remote field. The comparison between the measured and predicted value of field strength indicate the availability and accuracy of the software. And it can be applied to monitor the field strength of BPM signal in far field.

Design and Implement of FFT Core Applying to the Fast Acquisition of GNSS Signal

TANG Zhen-wu；SHENG Li-yua；YANG Jun

2013, 33(3):  28-33.  doi:10.12060/j.issn.1000-7202.2013.03.06

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With the requirements of fast acquisition of GNSS signal, a FFT processor of radix-2 with 256 points complex input is designed in this paper. The FFT core was designed with Verilog HDL language under the Quartus II 7.2, and in order to improve the simulation efficiency, Matlab is used to simulate together with Quartus. Finally a test was done on the design and the result shows that the FFT processor designed in the paper has less resource consumption and higher processing speed, meeting the basic requirement of GNSS receivers.

A High-effective TCXO Test Method based on Parallel Frequency Measurement

CHEN Liang；HUANG Yang-bo；TIAN Feng；WU Shun-xiao；OU Gang

2013, 33(3):  34-38.  doi:10.12060/j.issn.1000-7202.2013.03.07

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The present TCXO test systems are of low test efficiency because of limited frequency measurement capacity. A parallel frequency measurement method based on directly frequency measurement is proposed in this paper and a parallel TCXO test system using this method was developed. At least 100 TCXOs can be measured simultaneously in the proposed test system, and its test capacity can be expanded further. Its frequency measurement error is less than ±4×10^-9 fully meeting the accuracy requirement of the design and production of state-of-the-art TCXOs. The test and production efficiency of TCXOs can be raised using this test system.

Wavelet Image Lossless Compression based on Truncation and Rearrangement

GUO Hui-jie

2013, 33(3):  39-43.  doi:10.12060/j.issn.1000-7202.2013.03.08

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According to the energy aggregation properties of image wavelet coefficients, a new wavelet image lossless compression algorithm based on rearrangement and truncation is proposed. On the basis of discrete wavelet transform, the algorithm successively classifies and rearranges the low frequency subband coefficients in line with Otsu method and Hilbert curve, while, respectively makes adaptive truncated singular value transform on all the high frequency subbands in light of information entropy cost function, followed by entropy encoding for lossless compression. Experimental results show the proposed algorithm effectively reduces encoding bit rate with simple implementation, improving the compression ratio of image lossless compression.

Automatic Test System for Lower Power Mount Calibration based on Virtual Instrument Technique

WANG Lin-lin；ZHANG Qin；XU Jing-jiu；YANG Fan

2013, 33(3):  44-47.  doi:10.12060/j.issn.1000-7202.2013.03.09

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It is quite time-consuming and labor-intensive in the process of the traditional measurement of the calibration of power sensors. This article describes the automatic test system for lower power mount calibration based on virtual instrument technology. This system achieves the communication among the standard devices and the computer with the GPIB interface bus, and achieves the automation by the means of using the SCPI to control the instruments.

A New Frequency Measurement Method for Sinusoidal Signal based on Double Channel

HENG Sheng-feng；CHEN Xue-lei；ZHOU Zhi-li

2013, 33(3):  48-52.  doi:10.12060/j.issn.1000-7202.2013.03.10

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The accuracy of traditional method for frequency detection based on auto-correlation is not high,and a new method for frequency of weak sinusoidal signal in powerful noise based on dual-channel is introduced in this paper. Using the principle of multi-layer correlation and the curve fitting technique with only four points and uses multi-point frequency compensating technique. The simulations proves its feasibility and effectiveness to detect the weak sinusoidal signal and having much higher resolution than auto-correlation method. So it has some practical value.

Research and Design for Data Automatic Transmission System of Test Equipment

SHI Wei-feng；LUO Hua-feng；YU Peng

2013, 33(3):  53-58.  doi:10.12060/j.issn.1000-7202.2013.03.11

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Currently, test information generated by various types of test equipment has various forms, such as paper documents, electronic documents and so on. The information is isolate in the terminal test equipments, and can’t achieve information integration and sharing. The information construction is seriously hampered. For this, the overall structure, data Transport Specification and data transfer process of test equipment data automatic transmission system are researched firstly. On this basis, the system hardware, software and data transmission security are designed. The data automatic transmission system is verified in a new type of missile test equipment. Ethernet-based data collection, transmission and processing of automatic test equipment are realized, and lay the foundation for the follow-up test equipment sharing and remote collaborative test research.

Automatic Detection System Design based on Virtual Instrument

ZHAI Wei-gang；TAI Jing；WU Li-gang

2013, 33(3):  59-62.  doi:10.12060/j.issn.1000-7202.2013.03.12

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In view of the existing limitations of traditional detection technology, to improve the degree of automation and precision of radar monitoring and control system, analyzes the characteristics of virtual instrument technology, design a set of automatic monitoring system, on the basis of the hardware selection. Summary of the graphical programming language LabVIEW advantage, the program can easily complete the data acquisition, signal analysis function. The application of virtual instrument technology in engineering detection has high precision, simple operation and high reliability and is easy to expand.

The Precision Measuring Method of Vertical Launcher Rail base on the Laser Tracker System

SHAO Bing；CI Xuan

2013, 33(3):  63-67.  doi:10.12060/j.issn.1000-7202.2013.03.13

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The article takes a method to check the precision of vertical launcher rail by managing the laser tracker system. Base on analyzing the measurement theory of the laser tracker system, the method actualizes the checking of vertical launcher rail, and put forward the particular steps of back-check. At last, the article gets an evaluation of uncertainty measurement to validate the validity and feasibility of this method.

Research on Measured Angle System based on RTX Real-time Subsystem

GAO Yang；ZHANG An-qi；ZHANG Xin-lei；TANG Sheng-quan

2013, 33(3):  68-70.  doi:10.12060/j.issn.1000-7202.2013.03.14

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For the precision of angle speed test, to develop the new measurement method in the RTX real-time subsystem which used VC process to acquit data and VB environment to control. It made real-time monitoring and testing easier, and had advantages of convenience, adaptability and so on. It improved independence from measurement system to turntable’s.

Error Analysis and Compensation of Speed Reducer in Electrical Steering Engine’s Transmission Characteristics

LI Kai；YUAN Feng；HU Ying-hui

2013, 33(3):  71-76.  doi:10.12060/j.issn.1000-7202.2013.03.15

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During the course of electric steering engine’s transmission experiment, the measuring errors generated from mechanical installation, bearing friction and electrical machine drivers’ nonlinearities are likely to be converted to ratio’s measurement error, and decrease precision. Subjected to the speed reducer, the mathematical model of such system is established by means of dynamics equations, the measurement errors generated from mechanical installation and bearing friction are regarded as determined system error by theoretical analysis, and a new method is provided of preprocessing actual measuring data and improving ratio precision according to simulation results. The calculated results imply this method is to some extent able to compensate the measurement errors from electrical machine driver nonlinearities.

Research on Digital Simulation in Flight Dynamics of Towed Target System

CHEN Feng；ZHU Wen-lai；GE Feng

2013, 33(3):  77-80.  doi:10.12060/j.issn.1000-7202.2013.03.16

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Firstly, the model of flight dynamics of towed target system is simplified, and the fundamental principle of digital simulation in flight dynamics of towed target system is elaborated. Secondly, a linear processing is taken in model for defining the relation between lift force and rudder wing angle, changes in both tension and height, as well as the corresponding damping factor to vertical speed. Thereby, the linear differential equations are established and the transfer function in vertical motion of towed target with vertical height, speed and rudder wing angle is solved. Finally, full digital simulation study is taken in the working procedure of towed target system under different oceanic condition, different deviation of acceleration and height. The research result will contribute to the design and application study of towed target system.