基于零陷展宽的米波雷达低仰角测高方法  

Altitude Measurement of Low-angle Target Based on Null Broadening in VHF Radar

作　　者：王梅 陈伯孝[1] 徐赛琴 夏金艳 WANG Mei;CHEN Baixiao;XU Saiqin;XIA Jinyan(National Lab of Radar Signal Processing,Xidian University,Xi'an 710071;Xi'an Chaoshi Sensing Technology Co.,Ltd.,Xi'an 710065)

机构地区：[1]西安电子科技大学雷达信号处理国家重点实验室,西安710071 [2]西安超视传感技术有限公司,西安710065

出　　处：《火控雷达技术》2022年第4期11-16,共6页Fire Control Radar Technology

基　　金：国家自然科学基金(61971323)。

摘　　要：针对米波雷达在复杂阵地环境下低仰角测高服从高斯分布的多径分布源模型,提出一种基于零陷展宽的低仰角测高方法。该方法首先将直达波与多径反射波视为干扰信号并构造干扰导向矢量协方差矩阵,然后再利用投影变换和对角加载技术保留预设干扰区域扩展后的协方差矩阵,最后采用指向偏离搜索仰角的空域滤波器对阵列接收回波数据进行滤波处理,滤波后输出信号功率最小时对应的正角度即为目标仰角的估计值。相较于传统的超分辨算法,本文算法在复杂阵地条件下具有更高的测角和测高性能,并且可适用于低信噪比和少快拍数条件下的低仰角目标角度估计。计算机仿真结果验证了所提算法的有效性。A low elevation angle altitude measurement method based on Null Broadening was proposed for VHF radar to address low elevation angle altimetry in a complex array environment obeying a Gaussian distributed multi path distribution source model.The method first treated the direct wave and multipath reflected wave as interference signals and constructed the interference vector covariance matrix,then used the projection transformation and diagonal loading techniques to retain the covariance matrix after the expansion of the preset interference area,and finally the array received echo data were filtered by a spatial filter pointing at the deviated search elevation angle,and the positive angle corresponding to the minimum power of the filtered output signal was the estimated value of the target elevation angle.The proposed algorithm had higher angle and performance measurement than the conventional super-resolution algorithm under complex position environment,and can be applied to the problem of estimating the angle of low-angle target with low signal-to-noise ratio and low number of snapshots.Computer simulation results verified the effectiveness of the proposed algorithm.

关 键 词：米波雷达 低仰角 分布源 空域滤波 零陷展宽 

分 类 号：TN953.5[电子电信—信号与信息处理]