基于相关处理的非合作信号增强技术

Non-cooperative Signal Enhancement Technique Based on Correlation Processing

面对低截获概率雷达、超视距侦察等高灵敏度接收需求,现代电子侦察设备需要完成对弱小信号的检测处理。大型侦察设备可以采用相控阵技术,通过模拟或数字波束合成来提高系统灵敏度,但是随之带来了系统大小、重量和功耗(SWaP)的急剧增加,无法满足对于SWaP要求十分苛刻的应用场合。相关处理技术作为一种信号增强手段,无需信号先验知识,十分适合非合作信号的侦察接收。文中首先分析了相关处理技术的算法原理,比较了自相关和互相关两种方法的信噪比提升性能,最后通过计算机仿真和工程实践验证了该技术的有效性。当输入信号信噪比为-7 dB时,通过互相关方法可以提高信号处理增益20 dB,说明相关处理方法在非合作信号增强接收领域具有一定意义。

In the face of high sensitivity reception requirements such as low interception probability radar and over-the-horizon reconnaissance,weak signals need to be detected and processed by the modern electronic reconnaissance equipment.Phased array technology in large reconnaissance equipment can be used to improve system sensitivity through analog or digital beam forming,but it has brought about a sharp increase in system size,weight,and power consumption(SWaP),which can not meet the very demanding application requirements for SWaP.As a signal enhancement method,correlation processing technology doesn't require prior signal knowledge and is very suitable for reconnaissance and reception of non-cooperative signals.In this paper,the algorithm principles of correlation processing technology has been analysed,autocorrelation and cross correlation methods are compared to improve the signal-to-noise ratio,through computer simulation and engineering practice the effectiveness of this technology is verified in the paper.When the signal-to-noise ratio of input signal is-7 dB,the signal processing gain can be improved by 20 dB through the cross correlation method.This result indicates that the correlation processing method has certain significance in the field of noncooperative signal enhancement reception.