直升机载雷达旁瓣杂波精确定位与仿真  

Precise Positioning and Simulation of Target Signal for Helicopter-borne Radar

作　　者：叶爱兵 王玉琪 陈刚 YE Ai-bing;WANG Yu-qi;CHEN Gang(AVIC LEIHUA Electronic Technology Institute,Wuxi Jiangsu 214063,China)

机构地区：[1]中国航空工业集团公司雷华电子技术研究所

出　　处：《计算机仿真》2019年第9期27-32,56,共7页Computer Simulation

基　　金：航空基金(2015ZC07004)

摘　　要：直升机载雷达低空目标探测时可根据惯导信息、雷达参数精确定位主瓣和旁瓣杂波位置,消除主瓣和旁瓣杂波对目标检测的影响。而复杂山区环境中使用时由惯导信息、雷达参数计算的旁瓣杂波位置将偏离真实的旁瓣杂波轨迹,如何精确定位旁瓣杂波是保证直升机载雷达复杂山区环境下低空目标检测性能的一大难题。为解决上述问题,提出一种利用动态规划思想的旁瓣杂波定位方法,根据动态规划思想将距离-多普勒频谱图沿距离方向划分为多个阶段,每个阶段具有等长度距离门数,沿决策轨迹上功率和作为每个阶段的指标函数,多阶段总功率作为最优指标函数,规划方程中引入方向加权系数,降低先前决策对后续决策的影响,使旁瓣杂波精确定位问题满足无后效性条件。仿真与实测数据处理表明,相比传统的惯导定位方法,上述方法能够精确定位旁瓣杂波位置,保证直升机载雷达山地环境中低空目标探测性能。When the helicopter-borne radar detects the low-altitude target,it can accurately locate the main-lobe and the side-lobe clutter according to the inertial guidance information and radar parameters.The effect of main-lobe and side-lobe clutter on target detection can be eliminated in this way.The location of the side-lobe clutter calculated by inertial guidance information and radar parameters will deviate from the real side-lobe clutter trajectory when the helicopter-borne radar works at low altitude in mountainous environment.How to accurately locate the side-lobe clutter is a major problem to ensure the detection performance of low-altitude targets.In order to solve this problem,a new method of using dynamic programming is proposed to locate the side-lobe clutter.According to the dynamic planning idea,the Range-Doppler spectrum diagram is divided into multiple stages along the Range direction.Each stage has an equal number of Range sampling points.Total power along the decision path is an indicator function for each stage.Multistage Total Power is the Optimal Indicator Function.Introduction of directional weighted coefficients in the programming equation is to reduce the impact of previous decisions on subsequent decisions.The problem of accurate location of side-lobe clutter is satisfied with the condition of no post-effects.Simulation and actual data processing show that this method can accurately locate the side-lobe clutter position and ensure the detection performance of low-altitude targets when the helicopter-borne radar works in mountainous environment.

关 键 词：旁瓣杂波 动态规划 方向加权系数 低空目标 

分 类 号：TN955[电子电信—信号与信息处理]