广义余弦窗对全固态天气雷达弱目标探测的影响  

Effect of Generalized Cosine Window on Weak Target Detection of All-Solid-State Weather Radar

作　　者：李睿[1] 何建新[1] 史朝[1] 唐顺仙 

机构地区：[1]成都信息工程学院中国气象局大气探测重点开放实验室,成都610225

出　　处：《气象》2014年第3期305-312,共8页Meteorological Monthly

基　　金：国家自然科学基金面上项目(41075010);国家高科技研究发展计划项目(2007AA061901)共同资助

摘　　要：气象雷达脉冲压缩技术的应用关键是要尽可能地抑制脉冲压缩后的距离旁瓣。具有钟形特性的广义余弦窗加权函数能有效的平滑频谱边缘,提升主旁瓣比,因而这类窗被广泛地应用于线性调频信号的脉冲压缩旁瓣抑制技术中。文章采用广义余弦窗作为加权网络对线性调频脉压信号进行抑制旁瓣的处理,并对其探测弱天气目标的能力做了对比分析。文章首先介绍了脉冲压缩技术以及评判旁瓣抑制效果的主要性能指标,其次对广义余弦窗的频谱特性进行了仿真和分析,最后将广义余弦窗引入全固态天气雷达真实回波数据的信号处理中,得到处理后的回波图并结合现有的多普勒天气雷达反射率因子回波图给出了对比分析结果。The key to application of weather radar pulse compression technology is to suppress the distance side lobe after pulse pressure. The generalized cosine window which has a bell-shaped feature can effectively smooth spectrum edge, reduce the ratio of main lobe and side lobe, so it is widely applied to linear FM signal pulse pressure side lobe suppression technology. This paper studies about the side lobe suppression using the generalized cosine window as the weighted network, and makes a comparative analysis of their ability to detect weak target. At first, the article briefly describes the pulse compression technology and the main performance indicators of judging side lobe suppression effect and then presents a simulation of the spectral characteristics of the generalized cosine window. Finally, the paper brings the generalized cosine window into the signal processing of the real solid-state weather radar, getting the echo images, making a comparison of Doppler weather radar and giving comparative analysis results.

关 键 词：天气雷达 旁瓣抑制 加窗 固态 

分 类 号：P412[天文地球—大气科学及气象学]