方位多通道SAR的通道间误差影响分析

方位多通道合成孔径雷达(SAR)通过多通道接收采样与方位频谱重构,突破了模糊设计约束,具备同时大幅宽和高分辨率的能力.然而,雷达系统多路接收通道间幅相不一致性和卫星姿态的不稳定等因素均造成通道间误差,造成SAR成像质量的下降.将基于通道误差对方位多通道SAR成像质量的影响展开,首先分析了存在通道误差时的多通道SAR信号模型,并给出存在通道误差时的通道误差补偿流程和频谱重构方法;根据给出的信号误差模型和频谱重构算法,结合仿真数据详细对比分析了不同通道误差对SAR成像性能的影响,相关分析结果用于指导方位多通道SAR系统通道系统设计.

Analysis of theeffect of channel error on azimuth multi channel SAR

The azimuth multi-channel SAR,which is based on multi-channel sampling and azimuth spectrum reconstruction,breaks through the ambiguity design constraints,and has the capability of wide swath and high resolution at the same time.However,the amplitude and phase inconsistency of the multi-channel and the instability of the satellite attitude cause the error,which results in the decrease of the SAR imaging quality.In this paper,the effect of channel error on the quality of azimuth multi-channel SAR imaging is studied.Firstly,the multi-channel SAR signal model with channel error is analyzed;the channel error compensation process and spectrum reconstruction method are presented;According to the signal error model and spectral reconstruction algorithm is given with simulation data,the influence of different channel errors on the performance of SAR is analyzed in detail,and the results are used to guide the design of multi-channel SAR system.