宽带信号的数字测向算法研究

Algorithm of Direction Finding for Broadband Digital Signal

数字测向是电子侦察领域的一项重要内容。本文介绍了多基线测向算法,对其解模糊原理及范围作了深入分析,并给出了常见宽带信号的数字鉴相算法。该算法对这些宽带信号采用非线性变换,将其变为常规信号后进行处理,估计出该宽带信号的方向。本算法在较低信噪比条件下仍有较高精度。

Direction finding is an important research subject in the electronic reconnaissance field. This paper presents an algorithm for direction finding of the digital signal based on the multi-baseline system and analyzes the principle of digital phase distinguishing. The algorithm for phase distinguishing of broadband (LFM,BPSK,QPSK) digital signal and resolving phase ambiguity is studied. The broadband signal can be transformed into normal (sine or cosine) signal by corresponding nonlinear transformation. The direction of the broadband signal can be deduced from its phase estimated by the corresponding normal signal. A high accuracy result of direction finding can be obtained under the condition of low signal-noise ratio.