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On Detection of the DS-based Embezzled Signal in Satellite Transmitters

Author: ZhenLiPing
Tutor: QiuTianShuang
School: Dalian University of Technology
Course: Signal and Information Processing
Keywords: Spread Spectrum Communication Signal detection Cyclic autocorrelation Code rate SVD
CLC: TN927.2
Type: Master's thesis
Year: 2008
Downloads: 74
Quote: 0
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Abstract


Satellite communications system satellite communications fraud detection problem is solved in one of the problems . Theft of satellite resources roughly divided into two cases, one is the use of idle resources in the frequency band transponder for transmission, the other is in the normal traffic signal superimposed on the DS (DS) signal theft signal transmission. At present, for the first issue of misappropriation has some solutions , and for the DS signal theft detection problem has not been reported proven methods , so this issue is very important to explore research significance , and has potential applications in significance. This paper focuses on the noise in the DS signal detection and parameter estimation method a study , on the basis of satellite transponder theft DS signal detection were studied, proposed a SVD and cyclic autocorrelation method of combining . This paper mainly conducted in the following areas: ( 1 ) introduces the research background and significance , and the current status of DS signal detection studies were brief. ( 2 ) introduction of the DS signal communication system, the basic principles and characteristics . Brief introduction of satellite transponder relevant knowledge. Studied the presence of signal theft DS satellite transponder communication model , and gives a misappropriation of DS signal transmission block diagram. ( 3 ) DS -depth study of the noise signal detection methods, including autocorrelation function of the second moment method, cyclic spectrum method, square multiplier method, quadratic spectral method. Gives the DS signal detection and parameter estimation theory , and the first three methods to do about DS signal detection and parameter estimation performance of the computer simulation, gives some analysis. ( 4 ) proposed a SVD and cyclic autocorrelation combination of methods to detect the theft of satellite transponder signal DS . The method first mixed signal using the SVD method weaken the normal satellite service signal , then the cyclic autocorrelation method uses a DS -dimensional slice for theft detection signal , this method avoids dimensional search , improve the computational efficiency , the satellite transponder misappropriation of signal detection problem provides a solution.

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CLC: > Industrial Technology > Radio electronics, telecommunications technology > Wireless communications > Satellite Communications and Space Communications > Satellite Communications
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