Research On Multichannel SAR Target Feature Manipulation

Multichannel SAR has a higher degree of freedom than single-channel SAR,and can observe the Earth's surface scene from multiple angles,which greatly improves the ability to acquire ground information.Multichannel SAR can not only realize the traditional two-dimensional high-resolution imaging,but also the functions of height measurement,moving target detection and imaging,and interference suppression.It plays an important role in military and civilian fields.Especially the wide application in the military field poses a huge threat to the protection of our military targets.It has become more and more urgent to counter the multichannel SAR effectively.This dissertation is based on the traditional SAR digital radio frequency modulation technology.It focuses on the deception interference technology of multi-channel SAR-GMTI and multi-channel InSAR.The dissertation is divided into five chapters,the contents of which are arranged as following:Chapter 1 elaborates the background and necessity of this dissertation,presents the development of the multichannel SAR,summarizes the research status of manipulation of multichannel SAR target feature,and lastly briefly introduces the major work and the framework of this dissertation.Chapter 2 introduces the basic concepts and fundamental principles of multichannel SAR target feature manipulation,including the principle of SAR-GMTI moving targets detection and imaging,the principle of InSAR altimetry,the SAR false targets generation,and the limitations of a single jammer against multi-channel SAR.Chapter 3 studies the manipulation of a large number of false moving targets feature against dual-channel SAR-GMTI.Firstly,a method for generating false stationary targets by using two coherent jammers is introduced.On this basis,a novel false moving targets generation method against dual-channel SAR-GMTI is proposed by changing the complex modulation modulated in each jammer.Then,based on the SAR large deceptive scene generation techniques,a fast algorithm for generating a large number of false moving targets is given.Lastly,the simulation is given to demonstrate the effectiveness of the proposed method.Chapter 4 studies the manipulation of false moving target feature method against multichannel SAR-GMTI based on multiple jammers.The shortcomings of two jammers against three-channel SAR-GMTI is first analyzed and then a conclusion is given that to effectively jam multichannel SAR-GMTI,the number of jammers must be more than the number of channels of the multichannel SAR-GMTI.Next,a novel deceptive jamming method by using three synergetic jammers against three-channel SAR-GMTI is given.To making the deceptive jamming more robust,using the condition number to deploy three jammers reasonably is introduced.In the end,a general architecture of multiple transponders deceiving multichannel SAR is also given.Simulations verify the effectiveness of the proposed methodChapter 5 studies the manipulation of three-dimension(3D)false scene target feature against multichannel InSAR.First of all,an effective 3D false scene generation method against dual-channel InSAR is introduced.On this basis,a novel 3D false scene generation against multichannel InSAR is proposed.Next,combining the SAR large deceptive scene generation techniques,a fast algorithm for creating the 3D false scene is presented.Finally,simulations were performed from single false target generation to 3D deception scene generation.