末制导雷达对舰船目标成像转角分析

Analysis of rotation angles in ship target imaging based on missile-borne radar

着重针对弹载雷达对舰船目标进行逆合成孔径雷达(inverse synthetic aperture radar,ISAR)成像的转角条件进行研究。ISAR成像依靠雷达与目标的相对转角,转角太大或太小都会导致成像质量下降。在弹载雷达平台和舰船目标同时运动的情况下,ISAR成像总转角是由导引头按弹道飞行形成的转角和舰船航行、晃动所导致的转角的合成,可以依据回波信号进行估计。分析了ISAR成像所需转角范围,在对弹目相对转角建模的基础上,针对弹目相对转动非匀速的情况进行转角估计,判断任意时刻弹目相对转角是否满足成像转角条件。

The rotation angle condition in ship target inverse synthetic aperture radar（ISAR） imaging based on missile-borne radar is analyzed.The quality of the radar imaging relies on the relative rotation angle of the radar and the target,and the ill-suited value of this angle will weaken the imaging quality.In the condition that radar and ship motion exist at the same time,the total rotation angle consists of the angle contributed by missile flight and the angle contributed by ship swing,and its value can be estimated by the echo.The angle scope for ISAR imaging is analyzed,and based on the model of the relative corner,the criterion whether the relative corner satisfies the ISAR imaging condition is put forward.