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Synthetic Aperture Radar Moving Target Detection And Imaging Studies

Posted on:2006-10-01Degree:MasterType:Thesis
Country:ChinaCandidate:X GaoFull Text:PDF
GTID:2208360152997943Subject:Communication and Information System
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Moving Targets Detection and Imaging (MTDI) is hot in Synthetic Aperture Radar (SAR) research and plays an important role in both martial field and civilian field. Now many countries in the world are making great efforts to develop advanced MTDI systems and explore high efficient MTDI algorithms. The key techniques of MTDI are studied in this dissertation for getting high detection probability, accurate parameters and good images of moving targets. The major work of this dissertation is as follows. 1. After analyzing the model of moving targets'echoes, the changes of Doppler history are discussed in detail, which are due to targets'moving. It is analyzed that the influence of the changes on the conventional SAR imaging. And it is also analyzed that the range migration of moving targets in time domain and frequency domain. 2. The algorithms of MTDI are divided into several classes, and those common methods are summarized in detail. After that, the other methods are introduced briefly. 3. Spectral-filter method is studied. Computer simulations were done with parameters of airborne SAR system. The results show that the moving target is detected availably. 4. Subaperture-clutter-cancellation method is studied and the theory of it is expatiated. After that, the frame diagram for realizing is given and some problems are analyzed. At last, the validity of the method is proved by computer simulations. 5. The limitation of those two methods mentioned above are amended by adopting time-frequency presentation. The moving target is detected by processing the experiment data, which are generated by adding the simulated data of a moving target to the real data of background. The azimuth location, range location and azimuth velocity, range velocity of the moving target are estimated and the target is relocated according to it's parameters.
Keywords/Search Tags:Synthetic Aperture Radar, Moving Targets Detection and Imaging, Spectral-Filter, Subaperture, Clutter Cancellation, Time-Frequency Presentation
PDF Full Text Request
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