弹载SAR大斜视SPECAN成像算法

SPECAN Imaging Algorithm for Missile-borne SAR with High Squint Angle SAR with High Squint Angle

由于导弹攻击的目标在航线前方,弹载SAR需具备大斜视成像能力。针对大斜视状态下回波数据方位向和距离向严重耦合、弹载SAR平台实时性要求高的特点,提出了一种基于谱分析(Spectral Analysis,SPECAN)算法的弹载SAR大斜视成像算法。通过在方位时域进行距离走动校正,降低了回波方位向和距离向的耦合;通过二维时域中方位向的SPECAN处理和方位向FFT,获得SAR成像结果。算法处理流程简单,是一种实时性高的中等分辨率成像算法,适合应用于弹载SAR大斜视成像。仿真验证了算法的有效性。

Missile-borne SAR needs a high squint imaging ability beca use the target that missile attacks is in front of the flight path.In high squin t imaging,echo data in range and in azimuth couples severely with each other and missile-borne SAR needs good real-time performance.A high squint imaging algo ri thm based SPECAN is proposed.This algorithm firstly corrects range migration in azimuth time domain to decrease the couple between azimuth echo and range echo;a nd then it performs azimuthal SPECAN process;at last after azimuthal FFT process,good SAR imaging results are acquired.This algorithm features simple process,go od real-time performance and medium imaging resolution,which is suitable for mi s sile-borne SAR high squint imaging.Simulation results also show the validity of this algorithm.