基于改进的快速RFT算法的高速目标检测  

High-Speed Target Detection Based on Modified Fast RFT Algorithm

作　　者：商哲然 谭贤四[2] 曲智国[2] 王红[2] 

机构地区：[1]空军预警学院研究生管理大队,湖北武汉430019 [2]空军预警学院陆基预警监视装备系,湖北武汉430019

出　　处：《雷达科学与技术》2016年第2期184-188,193,共6页Radar Science and Technology

基　　金：国家自然科学基金青年基金(No.61401504)

摘　　要：RFT算法是一种广义的MTD,可以沿着目标运动轨迹进行相参积累。通过分析RFT算法中产生的盲速旁瓣(BSSL)及其与主瓣之间的关系,将基于Chirp-Z变换的快速RFT和标准RFT算法结合,提出一种改进的快速RFT算法,在一个速度区间利用快速RFT搜索目标的模糊速度和距离单元,通过构建速度搜索函数利用标准RFT对目标进行精确搜索。与原有快速RFT相比,改进算法运算量明显减少且不会随着模糊因子的增加而急剧增加。通过仿真实验,验证了在理想条件下积累结果接近理论值。RFT is defined as a kind of general MTD,which can make coherent integration along the target moving track.According to the blind speed side lobes（BSSL）brought from RFT algorithm,the standard RFT and the fast RFT based on Chirp-Z transform is combined,then a modified fast RFT algorithm is proposed.In a velocity region,the fast RFT is used to search the ambiguous speed and range cell.Then the speed search function is built and the accurate parameter of the target is searched by standard RFT.Compared with the previous fast RFT,the calculation cost of the new algorithm is prominently reduced and has no a sharp increase with the increase of ambiguous factor.The simulation results prove that the integration performance of this method can almost achieve the optimal one under ideal condition.

关 键 词：临近空间 超高声速目标检测 相参积累 模糊因子 盲速旁瓣 

分 类 号：TN957[电子电信—信号与信息处理]