The digital television broadcasting-based passive radar is faced with the difficulties of real-time data transmission and processing due to its wide signal bandwidth and high baseband sampling rate. Aiming at the passive radar based on China mobile multimedia broadcasting(CMMB)signal,the part bandwidth of CMMB signal is used to reduce the baseband sampling rate,and a sub-band processing method is proposed. The re-sampling rate setting,reference signal sub-band purification and sub-band matching are researched emphatically. The multi-path clutter suppression and matched filtering are combined to analyze the effect of sub-band width and purity on target detection performance. The results of simulation and real data processing verify that the proposed method is effective,and lays the foundation for the real-time radar system.%数字电视广播外辐射源雷达的信号带宽大、基带采样率高,使得该体制雷达面临数据实时传输和处理的困难.针对基于中国移动多媒体广播(CMMB)信号的外辐射源雷达,利用CMMB信号的部分带宽来降低基带采样率,提出一种子带处理方法.其中,重点研究了重采样率设置、参考信号子带提纯和子带匹配问题,并结合多径杂波抑制和匹配滤波处理分析子带宽度和纯度对目标探测性能的影响.仿真和实测数据处理结果验证了所提方法的有效性,为该体制雷达的实时化奠定了基础.
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