Research On Several Issues Of Airborne SAR Space-Time Processing

Synthetic aperture radar(SAR)has the advantage of all-day,all-weather,highresolution imaging of ground and sea targets,so it has a wide range of application prospect.However,with the development of radar reconnaissance technology,especially the emergence of the active forwarding jamming method based on digital radio frequency memory(DRFM)system,it causes jamming targets appear in the acquired radar images,which brings great challenges to obtain original ground and sea features for SAR system.The airborne multi-channel SAR technology uses multiple receiving channels obtain echo from scenes and targets.Compared with utilizing single receiving channel,multichannels SAR can process echo from ground and jamming targets in the space and time domain simultaneously,which has the potential of anti-jamming imagining.Therefore,it is of great significance to research space-time processing technology on airborne multichannel SAR.This thesis focuses on the related issues of airborne multi-channel SAR space-time processing.The main work is as following:1.Establishing the range history echo model in time domain and space-time domain based on airborne multi-channel SAR,and analyzing the echo range history characteristics and comparing the differences of multi-channel range history,then researching the principle of active directed-wave deception jamming,which is basis for analysis of the subsequent space-time impact and propose of anti-jamming method.2.Establishing the space-time echo models of airborne multi-channel SAR under different error conditions,then analyzing the impact to echo space-time characteristic and compare the impact to performance of space-time adaptive algorithm in these cases,which provides theory support for the research on the space-time error compensation.3.An anti-jamming method based on space-time domain is proposed.Based on the difference of distributed characteristic in space-time echo domain of jamming and original scene,designing a jamming suppression filter in space-time domain and through simulation experiments it realizes the effective suppression of anti-deception jamming.