低频宽带雷达低仰角高精度测量方法

Method of Low Elevation Measurement in Broadband Low-frequency Radar

在跟踪低空目标时,低频宽带雷达跟其它低频雷达一样,由于波束较宽,受低空多路径的影响导致测角精度不高。针对这一问题,本文根据低频宽带雷达频率资源丰富的特点,提出频域波瓣分裂和宽带子带合成的方法,利用不同子带的分裂波瓣内在的相位关系,初步解算无模糊的高低角范围,再选取精度最高的归一化比幅曲线进行角度测量,最后通过仿真验证低空条件下噪声对测角误差的影响。

In tracking low altitude target, the elevation of a target can only be estimated roughly by low frequency radar, as well as the broadband low frequency radar, for this kind of radar has a wide beam which is usually be split because of the reflection from the ground. To resolve this problem, the paper proposes an accurate and effective method for measuring the elevation based on beam split and broad band synthetic, for the broadband low frequency radar has broad band. In this measuring system, phase relationship of different sub-band frequency is used to estimated range of elevation, and the highest precision of Amplitude comparison is used to calculate elevation. It has been proved that this approach is effective to measure the elevation of a target which has a rather low altitude.