返回散射回波去电离层相位污染方法比较与分析

Comparison and anyalysis of ionospheric phase decontamination methods for backscattered signals

高频信号利用电离层的反射作用进行目标探测,探测距离远,范围广,可应用于气象、军事预警、海面检测等领域。但是对于海上目标,尤其是舰船等慢速目标,由于海杂波的强烈干扰,致使信杂比很低,要求较长时间的相干积累时间。而电离层的时变性和多径效应的存在严重影响相干积累的效果。本文主要论述国内外学者就此问题提出的各种去电离层相位污染方法,并对其做了对比和分析。

High frequency signals take advantage of the refractive nature of ionospheric layer to detect targets . It＇s broadly used in weather, military alert, sea surface detection and so on for its detecting long distance and large area. However, it takes a long coherent integration time （CIT）, because of very low ratio of signal to clutter（SCR）. Unfortunately, the result will be affected by the timely variation of ionospheric layer and multipath effect. This paper mainly describes, compares and analyzes several ionospheric phase decontamination methods to resolve the problem.