一种基于降调频的宽带LFM信号DOA估计算法  

A wideband LFM signal DOA estimation algorithm based on down-chirp

作　　者：张佳[1] 贾鑫[1] 尹灿斌[1] 陈颖颖[1] 高阳[1] 

机构地区：[1]装备指挥技术学院光电装备系,北京101416

出　　处：《航天电子对抗》2011年第4期43-46,共4页Aerospace Electronic Warfare

摘　　要：传统的宽带LFM信号DOA估计算法,是直接对信号进行估计,为满足采样定理,需要很高的采样频率,数据量和运算量巨大。针对这一问题,提出一种基于降调频的宽带LFM信号DOA估计算法,采用基于改进谱形熵的自适应降调频技术,通过若干次降调频,将宽带LFM信号带宽降到接收机可以处理的范围内,再利用窄带LFM信号DOA估计算法估计到达角,最后通过仿真验证该算法能够有效地降低采样频率和运算量。The traditional wideband LFM signal DOA estimation algorithms deal with data directly,so they need very high sampling-frequency for sampling theorem,which leads to that the quantity of data and processing is very large.An adaptive down-chirp technology based on Puxingshang is put forward to dispose this problem.Through some times down-chirp,the bandwidth can be down to a narrowband that could be processed by receivers.And then the narrowband algorithm can realize DOA estimation,such time-frequency-MUSIC algorithm.Simulation results demonstrate that the algorithm reduces the quantity of data and processing effectively.

关 键 词：谱形熵 降调频 时频分析 DOA 

分 类 号：TN911.23[电子电信—通信与信息系统]