天地波雷达回波的直达波抑制

发布时间：2018-01-19 21:30

本文关键词： 高频天地波雷达直达波抑制自适应滤波多普勒展宽　出处：《中国电子科学研究院学报》2017年01期 　论文类型：期刊论文

【摘要】：高频天地波雷达是一种天发地收的新体制雷达,其信号传播信道主要包括电离层反射传播信道和海面绕射传播信道。电离层反射造成信号相位污染以及多径效应,接收机所接收到的天波直达波会发生频移和展宽,其强度一般远高于海洋回波,受污染后的直达波将会覆盖部分回波信息,影响海洋回波/海面目标的提取。本文根据天地波雷达直达波特性,提出了基于距离域自适应滤波抑制天地波雷达中的直达波强干扰的方法。该方法选择只含有直达波或直达波旁瓣信号的邻近距离元,作为自适应对消器的输入信号,实现天地波雷达回波信号中直达波及其旁瓣信号的抑制。实测结果表明,该方法能够很好的对直达波进行抑制,有利于海洋回波/海面目标信息的提取。
[Abstract]:High frequency ground and earth wave radar is a kind of new system radar. The signal propagation channel mainly includes ionospheric reflection propagation channel and sea surface diffraction propagation channel. Ionospheric reflection causes signal phase pollution and multipath effect. The direct wave of the sky wave received by the receiver will occur frequency shift and broadening, its intensity is generally much higher than that of the ocean echo, and the contaminated direct wave will cover part of the echo information. It affects the extraction of ocean echo / sea surface target. This paper is based on the direct wave characteristics of space and earth wave radar. In this paper, an adaptive filtering method based on range domain is proposed to suppress the direct wave strong interference in the ground and earth wave radar. This method selects the proximity distance element which only contains the direct wave or the direct wave sidelobe signal. As the input signal of adaptive canceller, the direct wave and its sidelobe signal in the radar echo signal are suppressed. The measured results show that the proposed method can suppress the direct wave well. It is helpful to extract the target information of ocean echo / sea surface.
【作者单位】：武汉大学电子信息学院;中国电子科学研究院;
【基金】：“十二五”国家863课题(2012AA091701,2012AA091702) 国家自然科学(61401316)
【分类号】：TN958
【正文快照】： 据有强的相关性h6_19]。针对窄带射频干扰和宽带0弓|言射频干扰在距离域的不同特性,C.Pan等人[19]利用自适应滤波技术,通过选择不同的输入信号分别对高频天地波雷达是一种新体制雷达,与传统的它们进行处理,结果显示,射频干扰得到有效的抑地波雷达和天波雷达相比,有着其独特的

【相似文献】