基于空间网格划分的地杂波建模新方法  

A New Modeling Method of Ground Clutter with Space Grid Structure

作　　者：王琪[1] WANG Qi(China Airborne Missile Academy,Luoyang 471000,China)

机构地区：[1]中国空空导弹研究院,河南洛阳471000

出　　处：《航空计算技术》2024年第3期20-24,共5页Aeronautical Computing Technique

基　　金：航空科学基金项目资助(2023Z037012003)。

摘　　要：雷达型空空导弹具有全天候、全空域作战能力,具有较强的低空下视能力。在导弹下视攻击时,地面多普勒杂波会影响导引头对真实目标的检测。针对高重频脉冲多普勒雷达导引头,提出了一种基于空间网格划分建立地杂波模型的新方法,以天线波束指向为中心,围绕天线主瓣在三维空间划分网格,之后计算投影到地面的网格面积,根据雷达方程建立回波信号模型。通过理论推导,给出了影响地杂波强度的主要因素,包括导弹距地面高度、导引头波束擦地角和地面反射率等。最后通过建立数字仿真模型验证了方法的正确性。该方法可以在保证杂波形态一样的同时减少仿真时间。The fourth-generation air-to-air missiles(AAM)with pulse doppler(PD)active radar seeker have all-day and all-airspace combat capabilities,and have strong low altitude attack capabilities.When the AAM attack the target which is below the AAM,the ground Doppler clutter can affect the detection of real targets by the radar seeker.A new method for establishing the ground clutter model based on spatial grid partitioning is proposed in this paper.Partition the grid around the main lobe of the antenna in three-dimensional space with the antenna beam pointing as the center,and calculate the grid area projected onto the ground,the the echo signal model based on radar equations is established.The factors which decided the energy of ground clutter are obtained from this modeling method,including the height of the missile,grazing angle of the seeker beam,the reflectance of the ground.The correctness is finally verified through computer simulation.This method can reduce simulation time while ensuring the same clutter morphology.

关 键 词：脉冲多普勒雷达 导引头 地杂波 空间网格 

分 类 号：O242[理学—计算数学]