Airborne Bistatic Sythetic Aperture Radar Channel Equalization And Clutter Suppression Methods

In bistatic SAR,transmitter and receiver are placed on different platforms.Compared with monostatic SAR,the bistatic SAR has the capability of anti-detecting,anti-jam.So it plays an extremely important role in the fields of military and civilian detection fields.Airborne bistatic SAR channel equalization and clutter suppression technology is based on bistatic SAR system,These two technologies are two necessary preconditions and links for detecting slow moving targets from background clutter.Channel mismatch will affect the performance of clutter suppression,and the performance of clutter suppression will seriously affect the effect of detecting slow moving targets.In this way,channel equalization and clutter suppression of airborne bistatic SAR are studied,and the following research work is carried out:1.This paper researches the echo and the channel characteristics in airborne bistatic system.Firstly,the echo models is established,and the characteristics of stationary clutter and moving target in time domain and frequency domain are analyzed;Secondly,the channel mismatch model is established,and the difference in amplitude and phase between the ideal channel and the equalization channel is analyzed,which has laid a foundation for the research on channel equalization.2.Aiming at the problem that the traditional channel equalization method can only equalize the channel amplitude and phase inconsistencies caused by the receiver,but the channel amplitude and phase inconsistencies caused by the feeder is not considered,An online adaptive blind equalization method is proposed to realize the equalization of various amplitude and phase errors between channels.3.A new method of bistatic SAR clutter suppression methods based on image domain Back Projection-Displaced Phase Center Antenna(BP-DPCA)are proposed,which solve the problems that the motion errors will defocus the image,in this way,we can detect the slow moving targets on the ground.The effectiveness of the above methods is verified by theoretical analysis and simulation experiments,and the airborne bistatic SAR channel equalization and clutter suppression are realized.