Target Localization And Tracking Of Multistatic Passive Radar Based On Navigation Satellites

Passive radar is one of the important directions for the development of new radar system technology.It attracts wide attention because of its good "four resistance" characteristics,low network detection cost,and flexible installation and deployment.With the complexity of radar application environment,the increase of available external illuminators,and the improvement of detection performance requirements,passive radar will develop in the direction of multi-source and multi-station in the future.Based on this,the research on the detection technology of multi-satellite passive radar is carried out in this paper.It mainly includes these parts: firstly,aiming at the background of target detection,positioning and tracking,the available resources of the Beidou satellite as an external illuminator are analyzed,and its detection performance boundary is explored.Then,in view of the large amount of data processing work introduced by multi-source and multi-station radar systems,this paper proposes two multi-source optimization methods to optimize the geometric configuration of multistatic system and improve the accuracy of target positioning.Finally,in the Beidou-based passive radar system,according to the influence of the target Radar Cross-Section(RCS)diversity on the tracking performance,the target tracking problem of multi-satellite information fusion is studied.The specific research includes the following three points:(1)When analyzing the available resources of Beidou satellites as external illuminators,the detection range,range resolution and the forward detection performance of the Beidou-based passive radar are analyzed.Then,combined with specific parameters,it can be seen that the detection range by calculation is limited.Therefore,this paper analyzes the feasibility of Beidou satellite signal-level fusion and improves the target detection range through the signal-to-noise ratio gain brought by multi-frequency fusion.At the same time,when Beidou satellites are used as a way to provide missile target information indication,in order to make up for the shortcoming of detection range,the radar receiver is placed in front of the missile launch platform and the advantage of Beidou satellite forward detection is used,and finally the remote guidance of multiple forward-looking satellites is studied.(2)The positioning optimization methods of multistatic passive radar are studied.firstly,several commonly used positioning methods of multistatic passive radar are introduced,and then two multi-source optimization methods are proposed.In a multistatic radar system,although the continuous expansion of the scale can bring more accurate target detection effect,it also brings a huge amount of calculation to signal processing,making it difficult for the system to achieve real-time processing.In order to solve this problem,this paper proposes two multi-source optimization methods,the covariance matrix fusion method and the convex hull optimization method,from the perspectives of resolution unit and resolution capability,respectively,to optimize bistatic T/R pairs.In this way,it is possible to control the size of the radar original data set without losing the performance of the multistatic system.Finally,with the Global Navigation Satellite System(GNSS)as the external illuminator,the feasibility of the two optimization methods under different conditions is verified.And the experimental results show that both methods have good selection ability and positioning optimization effect.In addition,these two methods can also be extended to other multistatic radar systems,which are helpful for practical real-time multistatic radar applications.(3)According to the influence of target’s RCS diversity on tracking performance,the Beidou-based target tracking problem of multi-satellite information fusion is analyzed under different signal-to-noise ratios and different range resolutions.And based on the centralized information fusion method,a preliminary simulation verification of the problem is carried out.It realizes the fusion of detection performance advantages under different bstatic configurations,and improves the target tracking accuracy.Finally,it makes a simple preparation for future research on target tracking of Beidou multi-satellite information fusion.