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...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。展开更多
The paper analyses the characteristics of radio frequency interference （RFI） in HF surface wave radar （HFSWR） which adopts the linear frequency modulated interrupted continuous wave （FMICW）. RFI will influence a...The paper analyses the characteristics of radio frequency interference （RFI） in HF surface wave radar （HFSWR） which adopts the linear frequency modulated interrupted continuous wave （FMICW）. RFI will influence all the range cells including all the positive frequency and negative frequency, and the negative frequency range cells contain only the interference information. Based on the above characteristics, we introduce and analyze a new adaptive interference mitigation beamforming algorithm using the negative frequency range cells samples to estimate the interference covariance matrix. Experimental results confirm that this general and robust algorithm can achieve effective RFI suppression using the data recorded by the HFSWR, located near Zhoushan in Zhejiang China.展开更多
文摘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。
文摘The paper analyses the characteristics of radio frequency interference （RFI） in HF surface wave radar （HFSWR） which adopts the linear frequency modulated interrupted continuous wave （FMICW）. RFI will influence all the range cells including all the positive frequency and negative frequency, and the negative frequency range cells contain only the interference information. Based on the above characteristics, we introduce and analyze a new adaptive interference mitigation beamforming algorithm using the negative frequency range cells samples to estimate the interference covariance matrix. Experimental results confirm that this general and robust algorithm can achieve effective RFI suppression using the data recorded by the HFSWR, located near Zhoushan in Zhejiang China.
