米波雷达低角测高受到地面或海面多径反射的影响,测量精度很低。由于目标镜向反射波与直达波的多普勒频差很小,而其他非镜像多径反射波与直达波频差较大,因此可以利用RELAX算法逐一剔除多径反射波,而保留了对测高有利的镜像反射波。文中提出了基于RELAX算法消除多径反射波的匹配阵波束形成米波雷达测高新方法。对实测数据的测高结果表明,该方法的测量误差低于5%。

The low-elevation height finding precision of meter-wave radar is very low due to severe multi-path reflections of ground or sea.As the Doppler frequencies of unwanted non-mirror multi-path reflections are fairly different from direct wave,a novel approach of height finding using the RELAX algorithm to eliminate the unwanted non-mirror multi-path reflections is proposed in this paper.The results to real data show that the height finding error of low-elevation target is less than 5%.