超分辨测高的试验研究

多径信号的存在,使得米波雷达在低仰角的测高成为难题。随着空间谱估计技术的发展,人们尝试采用阵列超分辨方法实现米波雷达的仰角维方向估计。简要介绍了常规测高法的局限性和角度超分辨实现测高的基本原理,以及在米波雷达中开展的测高试验情况,给出了若干淡水反射面条件下的外场试验数据。对多批目标的试验统计结果表明:在快拍数只有一个、单个阵元平均信噪比达到8dB以上时,采用空间平滑+最大似然超分辨处理法即可有效分离相干信号源、减小米波雷达在低仰角的测高误差。

Experimental Study of Super-resolution Height-finding

The existence of multi-path signal makes the height finding at low elevation angles in meter-wave radar become more difficult.With the development of technology in spatial spectrum estimation,the array super-resolution algorithms are attempted to achieve the direction estimation of elevation in meter-wave radar.This paper presents briefly the limitations of conventional height-finding method,the principle of the angle super-resolution method,and the height-measuring trial research of meter-wave radar.Finally,some outfield experimental data are given out on the signal reflection from freshwater surface.The statistical results of data of several targets coming from the experience indicate that the maximum likelihood method with spatial smoothing algorithm can be used to separate the coherent signals source in the condition of only single pulse in radar resource and above 8 dB average signal-noise ratio in one array,which lead to determining the precise elevations of targets to reduce the height-finding errors in low elevation angle of meter-wave radar.