Study On The Theory And Method Of Airborne SAR/SAR-GMTI Interference In Naval Battlefield

Airborne synthetic aperture radar(SAR)has the properties of high resolution and strong anti-interference,combined with ground moving target indication(GMTI)technology,the ground moving target can be detected easily from the ground clutter in SAR imaging results.The application of the airborne SAR/SAR-GMTI technology will pose a serious threat to our important maritime military targets.Therefore,the research on airborne SAR/SAR-GMTI jamming theory and method becomes more and more important.Based on the basic principle and the classical algorithm of airborne SAR and GMTI,the weak points of airborne SAR/SAR-GMTI are analyzed in following aspects: Signal reception method,Signal processing method,SAR image target extraction and Target feature interpretation.Then,the jamming methods of airborne SAR/SAR-GMTI in sea warfare is studied,and the simulation results show that the jamming methods are effective.The main research contents and achievements are as follows:1.An airborne SAR jamming technique based on motion ship wake is proposed.First,the image of the ship wake wave height is generated.Then,using ship wake image template to produce SAR false image jamming signal.Finally,the simulation results indicate that motion ship deceptive wake jamming is effective to produce vivid false ship wake image in SAR imaging.2.An efficient method to realize the ship wake jamming in airborne SAR is proposed.This method uses the SUSAN operator to detect the edge of the wave height image to reduce the data redundancy.The detected edge contour image is used to interfere with the modulation of the signal,which can effectively reduce the generation time of the interference signal.The simulation results verify the method efficiency.3.The influence of the yaw motion target on the SAR imaging results is analyzed,and the method of false yaw target jamming of airborne SAR-GMTI is proposed.The jamming signal is more realistic in the SAR imaging result because of carrying the yaw motion information,and it can also effectively counteract the three-channel GMTI processing.Simulation shows that the method can simultaneously against SAR imaging and GMTI three-channel cancellation processing.4.The effects of uniform moving targets on the SAR imaging are analyzed.The method of false uniform target interference at sea is researched.After the SAR imaging process,the realistic and uniform motion target results can be obtained.Simulation shows that this method can simultaneously against SAR imaging and GMTI three-channel cancellation processing.5.Combining the sea false yaw target jamming and the false uniform motion target jamming,the false yaw-uniform motion target jamming at sea is proposed.The jamming signal carries the yaw and uniform motion information of the sea target at the same time.The jamming effect was simulated and the effectiveness of the method was verified.