机载俯仰多通道气象雷达地杂波抑制新算法  

A Novel Ground Clutter Mitigation Method for Airborne Weather Radar Based on Elevation-dimensional Antenna Array

作　　者：谭鸿刚 吴迪[1] 朱岱寅[1] TAN Honggang;WU Di;ZHU Daiyin(Key Laboratory of Radar Imaging and Microwave Photonics,Ministry of Education,Nanjing University of Aeronautics and Astronautics,Nanjing 211106)

机构地区：[1]南京航空航天大学雷达成像与微波光子技术教育部重点实验室,南京211106

出　　处：《舰船电子工程》2021年第5期62-67,125,共7页Ship Electronic Engineering

摘　　要：机载气象雷达是飞机在航行途中的重要安全保障,而强度大,范围广的地杂波会干扰气象目标的正确识别。当气象目标和地面散射点处于同一距离门时,通过时域和多普勒域的杂波抑制方法存在一定缺陷,无法精确抑制地杂波。根据气象回波和地杂波到达雷达时的俯仰信息不同,采用俯仰维排列的天线阵进行地杂波抑制,并针对传统波束形成算法收敛速度慢,以及对协方差矩阵失配弱鲁棒的问题,提出了一种基于协方差矩阵重构的鲁棒波束形成算法。仿真实验以及仿真数据处理结果表明,该方法收敛速度快,能够在保留气象信息的前提下,有效抑制地杂波。Airborne meteorological radar is an important security guarantee for aircraft in the course of flight,however,the strong and widely distributed ground clutter disturbs the correct identification of weather targets.When meteorological targets and ground scattering points exist simultaneously in the same range gate,the clutter suppression methods in both time and Doppler do⁃main are defective and cannot mitigate clutter accurately.In this paper,according to the different elevation positions when meteoro⁃logical echo and ground clutter arrive from,an elevation-dimensional antenna array is used to suppress ground clutter.To solve the traditional beamforming algorithm's problem of slow convergence and the weak robustness to the mismatch of covariance matrix,a ro⁃bust beamforming algorithm based on covariance matrix reconstruction is proposed.Simulation experiments and simulation data pro⁃lessing results show that the proposed method can effectively suppress ground clutter while retain meteorological information with fast convergence rate.

关 键 词：机载气象雷达 鲁棒波束形成 地杂波抑制 分布式气象目标 收敛速度 

分 类 号：TN958[电子电信—信号与信息处理]