一种机载双通道SAR/GMTI自适应通道均衡方法的研究

An Adaptive Channel Balancing Method for Airborne Two Channel SAR/GMTI System Based on DPCA Technique

基于DPCA的机载SAR/GMTI系统中,通道幅相误差导致DPCA条件不满足,系统性能下降。在深入分析基于DPCA的双通道SAR/GMTI信号模型的基础上,给出了一种自适应通道均衡方法,给出了通道均衡的流程,分析了该均衡方法的性能。该方法使通道幅相特性在最小二乘意义下准确匹配,取消了系统对DPCA条件的严格要求。该均衡方法不需要天线参数、平台运动参数等先验知识。

Airborne SAR/GMTI system based on DPCA technique has tight limitations on the velocity of platform,PRF,and the phase and amplitude characteristics of two apertures and receive channels.Any error induces the dissatisfaction of DPCA conditions and the decline of system performance.This paper analyzes the signal model,proposes an adaptive channel balancing method,gives the channel balancing flow and analyzes the performance of this channel balancing method.This method makes the phase and amplitude characteristics precisely matched in the sense of Least Square,then reduces the requirement for DPCA conditions.This technique is based on a two-dimensional frequency domain approach which implies that the data sequences received by radar are sufficiently long.The performance of this technique depends on the Signal Clutter Ratio（SCR）.