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Based On Time-frequency Analysis Of Radar Target Recognition Technology Research

Posted on:2013-01-21Degree:MasterType:Thesis
Country:ChinaCandidate:Y YuFull Text:PDF
GTID:2218330371460182Subject:Communication and Information System
Abstract/Summary:PDF Full Text Request
In this thesis, focused on the targets in air with micro-movement, radar target recognition based on time-frequency analysis is studied. The main research work includes:1. Using time-frequency method to analysis object with Micro-Motion is studied. In the modelling software of GRECO, three targets with simple structure, cone, combination of sphere and cone, combination of cylinder and cone are taken as research object to caculate their dynamic RCS echo signals in different micromotion ways, such as roll, rotation, precession with the radial motion. Three types of time-frequency analysis methods, including short-time Fourier transform (STFT), Wigner-Ville transform, pseudo-Wigner-Ville transform and wavelet transform, are compared on the platform of MATLAB software. It is verified that pseudo-Wigner-ville transform can have a higher frequency resolution performance and a better adjustability with frequency shift.2. A classification method by using the waveform entropy feature is proposed. For different radial velocity of the target, the method of moving the waveform entropy diagram in the horizontal direction to extract the stable features is introduced. With the waveform entropy extraction analysis result of the target in different motion state by using different time-frequency analysis methods, waveform entropy as the feasibility of the feature classification is confirmed.3. The analysis of target classification algorithm performance is completed. From the four aspects of signal-to-noise ratio, frequency analysis methods, form of micromotion, classifiers, the performance of classification algorithm is confirmed respectively.
Keywords/Search Tags:Radar target identification, time-frequency analysis, short time Fourier transform, pseudo-Wigner-Ville transform, waveform entropy
PDF Full Text Request
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