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Development of Automatic Test and Identification System of Complicated Electromagnetic Signals

Author: ZhouHuaSheng
Tutor: WenYingHong
School: Beijing Jiaotong University
Course: Environmental Engineering
Keywords: Complex electromagnetic environment Signal monitoring GPIB Automatic test system
CLC: TN911.23
Type: Master's thesis
Year: 2009
Downloads: 116
Quote: 0
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Abstract


Today , with the utilization of the radio spectrum is becoming more and more dense , the signal modulation style is becoming more and more diverse , increasingly complex electromagnetic environment . Real-time monitoring of complex electromagnetic environment has a very important significance for the effective management of spectrum resources and maintain the order of the airwaves . In this thesis, design and development as the main monitoring equipment , spectrum analyzer and oscilloscope GPIB instrument control bus signals of complex electromagnetic environment automatic monitoring and identification system . Through the complex electromagnetic environment signal search, intercepted and analyzed to obtain the characteristic parameters of the signal and the type necessary to monitor, when a specific signal monitoring , signal perception in order to achieve the purpose . Complex electromagnetic environment signals automatically monitoring and identification system includes both hardware and software . The hardware part is constituted by the spectrum analyzer , oscilloscope , receiving antenna , the GPIB interface card , transmission cables and computer . Using the GPIB interface card , the data communication between a computer with a spectrum analyzer and oscilloscope . The GPIB bus interface is now commonly used in automated testing system of one of the standard configurations of the instrumentation , which is used to connect a plurality of measuring instrument and the computer a standard industrial control bus . Complex electromagnetic environment automatic monitoring and identification system software part of the signal using a high-level computer language Visual C # development , its function is to control the instrument automatically completed the search of the electromagnetic environment signals intercepted parameter measurement and signal recognition . Under the control of the computer , the spectrum analyzer to complete the automatic scanning of the bands designated and intercept the signal of the signal strength is greater than the set threshold values ??for parameters such as the frequency and intensity of the extracted signal and the standard signal with the signal in the database parameters for matching recognition . According to the result of the identification , and then focus on the unknown signal such time domain and frequency domain analysis detection the secondary recognition according to the result of the detection of the signal . Test results and comparison of results after computer processing , save to the system database , last monitoring reports generated and can be exported . This paper describes the design and development process of complex electromagnetic environment signal automatic monitoring and identification system , and measured in a laboratory environment , verify the feasibility and accuracy of the system .

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CLC: > Industrial Technology > Radio electronics, telecommunications technology > Communicate > Communication theory > Information Theory > Signal detection and estimation
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