Research On Spaceborne SAR Compression Interference And Anti-jamming Technology

As one of the most important radar system platforms,spaceborne SAR has been of strategic importance in military applications,so it is of great value in the research of spaceborne SAR confrontation technology.Compression interference and anti-jamming are important components in the study of spaceborne SAR confrontation,and the research of this jamming method is earlier,so the suppression of interference theory is relatively mature,but because of the continuous improvement of technology,some of the views in the traditional suppression of interference become no longer applicable.In this thesis,with the support of the National 863 Project,the following studies were carried out on the suppression interference and confrontation technology:This thesis analyzes the current research situation and theoretical research results of the current spaceborne SAR confrontation before the intervention study began,which provides a theoretical basis for studying the SAR jamming and anti-jamming technology.First of all,according to the current spaceborne SAR interference and confront demand analysis.The main research results of suppressing jamming technology at home and abroad are analyzed,and the problems and difficulties of pressing interference are analyzed.Based on the spaceborne SAR echo model and imaging technology,the feasibility of the spaceborne SAR interference is demonstrated from the power,and the early view and understanding of the suppression interference are improved.Secondly,based on the analysis of the demand ratio of the dry letter,the lower requirements of the jamming interference ratio of the spaceborne SAR are proposed,and the correctness of the view is confirmed by the simulation experiment.Then,the method based on the anti-compression system before and after imaging is studied.The interference is mainly used to interfere with the echo signal and the echo signal in the time domain and the frequency domain to suppress the interference,by setting the amplitude threshold to filter out the high frequency pulse interference.The use of multi-channel cancellation to suppress the coherent suppression of interference,the main principle is to interfere with a number of antenna receivers to produce a different phase difference,by compensating for the phase difference to achieve interference cancellation.Finally,a simple description of the system based on anti-jamming means.In addition,it is verified by some simulation experiments.For the continuous wave noise suppression interference,it is difficult to suppress the interference suppression because of its coincidence with the target signal in each transformation domain,and the new anti-jamming method is studied.The anti-jamming method after imaging is mainly to study the anti-compression method based on image domain.Based on the independent component analysis method,due to the difference in the distribution characteristics between the suppressed jamming signal and the target echo signal,and the statistical difference in the image domain,it is possible to separate the two from the kurtosis criterion to realize the separation of the interference signal from the target signal.Finally,the ICA method is compared with the results of conventional filtering method.The quantitative analysis shows that the ICA method has better effect on the suppression of interference in the image domain.