双基地ISAR高分辨距离像联合稀疏反演方法

A Joint Sparse Recovering Method for High Resolution Range Profile in Bistatic Inverse Synthetic Aperture Radar

双基地雷达是分布式雷达系统的基本构成单元,文中推导了双基地逆合成孔径雷达构型下的回波信号模型,从理论上证明了目标的高分辨距离像具有联合稀疏特性。为了解决双基地夹角使距离分辨率恶化的问题,文中提出一种基于双曲正切混合范数的联合稀疏反演算法,通过合理的参数设置可促进高分辨距离像的联合稀疏,能较好地消除双基地夹角对距离分辨率的影响,在较低信噪比的条件下获得比传统稀疏反演算法更好的反演性能。仿真结果验证了文中方法的有效性。

Bistatic radar is the basic unit of distributed radar system.The echo signal model under the configuration of bistatic inverse synthetic aperture radar is deduced in this paper.And it is proved theoretically that the high resolution range profile of the target has the characteristics of joint sparsity.To overcome the degradation of range resolution caused by bistatic angles,a joint sparse inversion algorithm based on hyperbolic tangent mixed norm is proposed.The joint sparisity of high resolution range profile can be promoted by setting reasonable parameters,the influence of bistatic angles on range resolution can be eliminated and better recovering performance can be obtained compared with the traditional sparse recovering method under the conditions of low signal-to-noise ratio.Simulation results are provided to demonstrate the effectiveness of the proposed method.