复杂地形环境下基于GAMP-STAP的低空风切变风速估计方法李海*①谢瑞杰①谢伶莉①孟凡旺②①(中国民航大学天津市智能信号与图像处理重点实验室天津300300)②(中国航空工业集团公司雷华电子技术研究所无锡214063)摘要：针对机载气象雷达在复杂的地形环境下探测低空风切变时，地杂波呈现非均匀特征和难以获取足够的独立同分布(IID)样本，导致空时自适应处理(STAP)杂波抑制性能变差，使得风切变风速估计不准的问题。该文基于杂波信号稀疏特性，提出一种广义近似消息传递(GAMP)STAP方法，GAMP-STAP仅利用少量的样本在复杂地形环境下实现了风速较准确的估计。该方法首先利用杂波脊的先验信息构造稀疏字典，然后在贝叶斯框架下利用GAMP算法估计杂波幅度，恢复杂波功率谱，进而计算杂波协方差矩阵，最后构造STAP滤波器实现杂波抑制以及风切变风速估计。后续实验仿真结果证明了该方法的有效性。关键词：机载气象雷达；风速估计；非均匀地杂波；广义近似消息传递中图分类号：TN959.4文献标识码：A文章编号：1009-5896(2023)02-0576-09DOI:10.11999/JEIT211500Low-altitudeWindShearWindSpeedEstimationMethodBasedonGAMP-STAPinComplexTerrainEnvironmentLIHai①XIERuijie①XIELingli①MENGFanwang②①(TianjinKeyLaboratoryforAdvancedSignalProcessing,CivilAviationUniversityofChina,Tianjin300300,China)②(AviationIndustryCorporationofChinaLeihuaElectronicTechnologyResearchInstitute,Wuxi214063,China)Abstract:Whenairborneweatherradarisusedtodetectlow-altitudewindshearundercomplexterrainenvironment,groundclutterpresentsnon-uniformcharacteristicsanditisdifficulttoobtainenoughIndependentIdenticallyDistributed(IID)samples,whichaffectsthecluttersuppressioneffectofSpace-TimeAdaptiveProcessingandmakestheestimationofwindshearwindspeedinaccurate.Basedonthesparsecharacteristicsofcluttersignals,aGeneralizedApproximateMessagePassing(GAMP)Space-TimeAdaptiveProcessing(STAP)methodisproposedinthispaper.GAMP-STAPachievesaccurateestimationofwindspeedincomplexterrainenvironmentwithonlyasmallnumberofsamples.Firstly,asparsedictionaryisconstructedbasedonthepriorinformationoftheclutterridge,thenGAMPalgorithmisusedtoestimatetheclutteramplitudeandrecovertheclutterpowerspectrumundertheBayesianfram...
