DVB-T2外辐射源雷达参考信号重构算法  

Signal Reconstruction of DVB-T2 Signals in Passive Radar

作　　者：王宠 万显荣[1] 沈季 但阳鹏 WANG Chong;WAN Xian-rong;SHEN Ji;DAN Yang-peng(School of Electronic Information, Wuhan University, Wuhan 430072, China)

机构地区：[1]武汉大学电子信息学院,武汉430072

出　　处：《科学技术与工程》2021年第36期15491-15496,共6页Science Technology and Engineering

基　　金：国家重点研发计划(2016YFB0502403);湖北省科技创新项目(2019AAA061);深圳市科技计划项目(JCYJ20170818112037398)。

摘　　要：第二代欧洲数字地面广播标准(DVB-T2)为数字视频广播(digital video broadcasting,DVB-T)的升级标准,采用了一系列宽带无线通信领域的先进技术,不仅提供了优质音视频服务,也为外辐射源雷达提供了新型照射源。外辐射源雷达利用参考信号与目标回波信号相关匹配来检测目标。为了获取纯净的参考信号,针对DVB-T2信号的结构特点,提出了适应DVB-T2系统的参考信号重构方法。重构的流程包括同步、信道估计、均衡、信道编码、星座映射、再调制等。首先研究基于P1符号的双相关算法,使同步结果更加精确;然后提出二维线性插值的信道估计算法。结果表明,DVB-T2信号的结构能实现更精确的同步效果,二维线性插值信道估计算法比一阶算法性能更好,实测数据验证了该算法能够改善参考信号的重构质量,得到较好的星座图和纯净的数据流。Second generation European digital terrestrial broadcasting standard(DVB-T2)is an upgraded standard of digital video broadcasting(DVB-T),and it adopts a series of advanced technologies in the field of broadband wireless communication,which not only provides high-quality audio and video services,but also delivers a new type of radiation source for passive radar.The passive radar uses the reference signal and the target echo signal to correlate and match to detect the target.In order to obtain a pure reference signal,a reference signal reconstruction method adapted to the DVB-T2 system was proposed based on the structural characteristics of the DVB-T2 signal.The reconstruction process includes synchronization,channel estimation,equalization,channel coding,constellation mapping,and remodulation.First,studies the dual correlation algorithm based on the P1 symbol to make the synchronization result more accurate;then proposes a two-dimensional linear interpolation channel estimation algorithm.The results show that the structure of the DVB-T2 signal can achieve a more accurate synchronization effect.The two-dimensional linear interpolation channel estimation algorithm has better performance than the first-order algorithm.The measured data verifies that the algorithm can improve the quality of the reference signal reconstruction and obtain better results on stellation diagram and pure data flow.

关 键 词：外辐射源雷达 参考信号重构 数字广播电视 第二代欧洲数字地面广播标准(DVB-T2) 

分 类 号：TN958.97[电子电信—信号与信息处理]