信号的循环平稳特性在电子对抗中的应用

随着电子技术的发展，基于阵列信号处理的ＤＯＡ（波达方向）估计将广泛应用于电子对抗的侦收系统及引战配合。本文介绍了高分辨率的ＤＯＡ估计的基本算法——典型ＭＵＳＩＣ算法。典型ＭＵＳＩＣ算法是以源发射信号相关矩阵为基础，因此需以窄带假设为前提。由于大部分人造信号（如ＡＭ、ＦＭ、ＢＰＳＫ等）都具有循环平稳特性，利用这一特性，以循环相关矩阵为基础，仍用ＭＵＳＩＣ算法，不仅可解决宽带源方向估计问题，而且可以大大提高ＤＯＡ估计的噪声抑制能力，增加阵容量。

The Application of the Cyclic Stationavity of signal in Electronic Countermeasures

With electronic technology developing, DOA (remote source direction of arrival)estimation based on array processing will be widely used to a spying system and fuze warhead coordination.Basic MUSIC algorithm for DOA estimation of high resolution is presented in this paper.Typical MUSIC algorithm is based on the correlation matrix of source transmitting signals.So it is necessary to regard narrow band supposition as the first condition.Since most of man made signals (such as AM,FM,BPS,etc) possess cyclic stationarity,on the basis of cyclic correlation matrix the MUSIC algorithm is still utilized according to this characteristic.Doing so not only can resolve the problem of wide band source direction estimation,but also can greatly improve the ability in the noise suppression of DOA estimation.