基于CFAR的三亚非相干散射雷达数据预处理研究  

Data preprocessing of Sanya incoherent scatter radar based on CFAR

作　　者：尹翰林 乐新安[1,2,3] 王俊逸 丁锋 宁百齐[1,3] 王永辉 李鸣远[1,2,3] 张宁 YIN HanLin;YUE XinAn;WANG JunYi;DING Feng;NING BaiQi;WANG YongHui;LI MingYuan;ZHANG Ning(Key Laboratory of Earth and Planetary Physics,Institute of Geology and Geophysics,Chinese Academy of Sciences,Beijing 100029,China;College of Earth and Planetary Sciences,University of Chinese Academy of Sciences,Beijing 100049,China;Beijing National Observatory of Space Environment,Institute of Geology and Geophysics,Chinese Academy of Sciences,Beijing 100029,China)

机构地区：[1]中国科学院地质与地球物理研究所地球与行星物理重点实验室,北京100029 [2]中国科学院大学地球与行星科学学院,北京100049 [3]中国科学院地质与地球物理研究所北京空间环境国家野外观测研究站,北京100029

出　　处：《地球物理学报》2022年第7期2394-2401,共8页Chinese Journal of Geophysics

基　　金：中国科学院稳定支持基础研究领域青年团队计划(YSBR-018);子午工程;国家自然科学基金(41427901)共同资助。

摘　　要：三亚非相干散射雷达是一部位于低纬度地区的先进的相控阵雷达系统,其主要任务是对地球电离层进行观测研究.在其探测区域内有许多航天器及碎片飞越,这些硬目标的存在导致回波信号比电离层非相干散射信号强度高出几个量级,进而影响电离层参量反演.为了有效消除原始数据中的硬目标信号,本文采用CFAR(constant false alarm rate)的方法来检测和消除硬目标.由于电离层背景不稳定,我们提出了基于传统OS-CFAR的自适应VI-OS-CFAR算法.在本文中,我们将新算法与传统的四种算法进行比较并将其应用于三亚雷达观测的数据处理中,结果证明了我们方法的有效性,该方法有望应用于三亚非相干散射雷达实际信号处理中.The Sanya Incoherent Scatter Radar(SYISR)is an advanced phased array radar system whose main task is to make observation and research of the Earth′s ionosphere.SYISR is in a low-latitude area,where many spacecrafts fly over.The existence of these hard target causes the echo signal several times stronger than the scattered signal by the ionosphere,which significantly influences ionospheric parameters retrieval.To effectively eliminate the hard target signal from the original data,this paper adopts the idea of constant false alarm rate(CFAR)to detect and eliminate the hard target.Since the background ionosphere is not stable,an adaptive VI-OS-CFAR algorithm based on the traditional OS-CFAR is proposed.In this article,we compare the new algorithm with the traditional four algorithms and apply it to the realistic SYISR data inversion.The preliminary results show promising validation of the method,which will be potentially used in radar operation in the future.

关 键 词：非相干散射雷达 CFAR 硬目标 

分 类 号：P353[天文地球—空间物理学]