摘要
传统电子对抗的测频、测向是独立完成的,即先由测频接收机测得信号频率,且由测向天线采用如相位干涉仪方法完成测向。相位干涉仪测向是针对单个脉冲信号的,对于多信号没有分辨能力,对于线性调频等时变频率信号也不能直接应用。本文提出了一种时频干涉仪联合时频一到达角(DOA)估计算法。通过对接收机输出信号作XWVD,提取XWVD的时频脊线,并测量时频脊点上的相位来实现信号频率、DOA的联合估计。该算法可实现对多信号的分辨;也可直接应用于线性调频信号的到达角估计。
The frequency measurement and direction finding are realized separately in traditional ECM field which the frequency obtained by frequency measurement receiver, and the direction finding is implemented using Interferometer etc. Moreover, Interferometer direction finding technique is adapted to estimating Direction-of-Arrival(DOA) of a single pulse. It can not resolve multiple signals. At the same time, it cannot be applied to time-varying frequency signals such as chirp signals directly. The algorithm of time-frequency interferometer for joint estimation time-frequency 、 DO A based on cross Wigner-Ville distribution (XWVD) is presented. By means of extracting the time-frequency ridge and estimating the phase of point along the ridge of the XWVD of the received signals, the joint estimation of time-frequency and DOA will be obtained. The method presented can resolve multiple signals. At the same time, the algorithm can applied to chirp signals.
出处
《信号处理》
CSCD
2004年第5期481-484,共4页
Journal of Signal Processing
基金
国防预研项目资助(41101030103)
