基于双通道互相关的微弱信号检测及测向方法

Study of Weak Signal Detection and Direction Finding Based on Dual-channel Cross-correlation

在复杂电磁环境和非合作接收条件下,会出现微弱目标信号淹没在噪声中难以检测和测向的情况。为解决这一难题,提出一种基于双通道互相关的微弱信号检测及测向方法,采用独立双通道接收体制,利用互相关累积处理,提高系统输出信噪比,实现对弱信号的检测;采用同步旋转扫描的双定向天线,利用最大信号法对不同天线指向下的相关峰幅度进行处理,以估计信号来波方向。仿真结果表明,可实现负信噪比条件下信号的准确检测与测向。

Complex electromagnetic environment and uncooperative receiving present more challenges to weak signal detection and direction finding,as weak signal is submerged in noise. To solve this problem,a method of weak signal detection and direction finding based on dual-channel cross-correlation is proposed.The system receives signal by independent dual-channels.The upper processing gain is achieved by using cross-correlation theory,so the weak signal can be detected. Two directional reconnaissance antennas scan synchronously.The direction of radiation source can be found by comparison of accumulated energy of cross-correlation.Simulation result shows that the algorithm can reach accurate signal detection and direction finding with high-precision in negative SNR condition.