无源相干定位系统中的主要问题之一就是接收机接收到的目标信号回波中的直达波干扰。传统的解决办法是采用自适应天线零陷对准直达波干扰,但广播信号的无源相干定位系统的天线零陷不够低。因此,文中提出了采用双通道对消的办法来抑制直达波,给出了所有的数学推导以及推导过程中的问题,最后给出了实验对消的结果。

One of major problems in PCL applications is the direct path interference(DPI).The reflected signal from the target is received in the background of this interference and the target would be buried in the side lobes of the DPI in the receiver circuit.Conventional solution to this problem is use of an adaptive antenna,steering null towards the interference.Unfortunately,this technology is not always effective.For PCL system based on FM radio the null depth obtained is not deep enough.This paper proposes a technique for DPI suppression based on double channel cancellation.A full mathematical derivation is provided and discussed in detail.It indicates that equalization and normalization is necessary before the process of cancellation.The cancellation experiment is also presented at the end of this paper.

TN953

国家自然科学基金