Distributed Spaceborne Sar Systems Dpca Moving Target Detection Technology

In last few years, people pay more attention to the distributed satellite SAR system. This model system brings forward a new concept SAR system. The micro-satellites cooperate together to accomplish one or more tasks, which has equivalent function with a big satellite. The new model system can provide more baseline and Contribute to data fusion. It has much more advantage than conventional single spaceborne SAR system because its baseline selection is agile and alterable. Also, it can be scale produced, and decrease launch expense.This dissertation mainly researches the Displaced Phase Center Antenna (DPCA) technique in the new system, and the contributions are calculated as following:1. The Doppler history is analyzed for the spaceborne bistatic SAR, Doppler center frequency and Doppler FM rate computational methods are studied. Summing up is done for the methods of moving target detection and imaging.2. This dissertation set up the model of the micro satellites going with the primary, deduced particularly formula, proved the DPCA technique can be used in the distributed satellite system to detect moving target. And some computer simulations illustrate the problem convincingly.3. This dissertation analyzes the detection performance of DPCA technique based on distributed spaceborne SAR system, particularly analyzes the K-distributed clutter's influence of the detecting results.4. We compare the detection performance of ground moving target of the ATI and DPCA technique for the new model of distributed spaceborne SAR in detail. And some typical computer simulation results are presented which illustrate the problem convincingly.5. The dissertation also discusses a kind of improving algorithm of DPCA: Adaptive Displaced Phase Center Antenna (ADPCA), indicate the ADPCA can be used in distributed space-borne SAR.