监视雷达低仰角测角方法分析与工程实现

Analysis and Realization on the Method of Low-Elevation Estimation Based on Surveillance Radar

监视雷达天线孔径较小、垂直波束较宽,当雷达天线低仰角探测目标时,波束打地严重,测量易受多路径影响,仰角测量精度难以满足要求。先对现代雷达常用的和差比幅与比相两种测角方法进行了分析,然后以相控阵天线为例,对两者在低仰角下的测向精度进行了仿真和深入分析。最后结合两种方法的优缺点,对某Ⅰ型监视雷达样机进行改进,使其满足比幅比相混合型测角的条件,并对改进后的样机作动态对比试验,再次证明两种常用测角算法在低仰角下的优劣,为工程应用提供参考。

The Surveillance Radar has small antenna aperture and also wide wave beam. These characters bring intense ground reflection and multi-route impact using in low-elevation. Because of this, it＇s difficult to get very satisfying estimate results. The paper firstly analyzes two common measuring method used in modem radars, which are sum-difference amplitude-comparison and phase comparison. And then the Phased array radar is made for example, simulate the measuring precision of two methods in the condition of low-elevation and multi-route reflection. By comparing the advantages and disadvantages of the two methods, the paper presents an improved model of one type surveillance sample radar, in order to make it possible to fit for mixed angle measuring method. Finally the paper uses dynamic comparing experimentation to reconfirm that phase comparison method is better in low- elevation measurement aspect, which can be offered as an example for project practice.