一种基于互模糊函数和累积量的时频差快速估计方法  

Fast Algorithm for Estimation of TDOA/FDOA Based on CAF and Cumulant

作　　者：廖帅 管雪华 李金洲 王成林 赫岩 LIAO Shuai;GUAN Xue-hua;LI Jin-zhou;WANG Cheng-lin;HE Yan(Beijing Institute of Remote Sensing Information,Beijing 100192,China;China Siwei Surveying and Mapping Technology Co.,Ltd,Beijing 100086,China)

机构地区：[1]北京市遥感信息研究所,北京100192 [2]中国四维测绘技术有限公司,北京100086

出　　处：《通信对抗》2024年第4期1-5,共5页Communication Countermeasures

摘　　要：双站无源定位系统多采用基于互模糊函数的时频差联合估计方法,该方法存在运算量大、实时性较差的问题。针对该问题,提出了一种基于互模糊函数和构造累积量的时频差快速估计方法。通过构造累积量将时频差分离,实现降维搜索以降低计算量,同时将降维搜索的时频差估计结果作为互模糊函数的时频差搜索窗口,大幅降低互模糊函数二维搜索时的计算量,通过一维粗搜与二维细搜相结合,实现时频差的快速估计。通过Matlab仿真试验,验证了该方法的有效性,在工程实践中具有应用价值。Cross ambiguity function(CAF)in the joint estimation of time difference of arrival(TDOA)and frequency difference of arrival(FDOA)is limited by large computation and weak effectiveness in the double-satellite passive location.To solve this problem,this paper developed a fast algorithm for estimation of TDOA/FDOA based on CAF and cumulant.In order to reduce computation cost,the proposed approach allows dimension-reduced searching through calculating the cumulative quantity of TDOA/FDOA and separating TDOA and FDOA.To further improve the computational eficiency for calculating the values of TDOA and FDOA by the method of CAF,the range of TDOA and FDOA from dimension-reduced searching is to be the search window in CAF.Through the combination of one-dimensional rough search and two-dimensional detailed search,we have achieved a fast estimation of the time frequency difference.The simulation results of Matlab show that the effectiveness of the improved algorithm.

关 键 词：无源定位 互模糊函数(CAF) 累积量 TDOA FDOA 

分 类 号：TN971[电子电信—信号与信息处理]