外辐射源雷达通过直达波提纯来获取雷达参考信号,且参考信号的纯净程度直接决定着雷达探测性能的好坏.针对全球性数字广播(digital radio mondiale,DRM)信号的特殊结构,提出通过重构发射信号来生成雷达参考信号的方法.首先基于DRM信号调制解调理论介绍了重构算法流程,然后通过实测数据处理验证了重构性能,最后分别从模糊函数性能与杂波抑制能力两方面定量研究了解调误码率对雷达探测性能的影响.仿真与实测结果均表明,通过本文所提重构算法能够获得良好的雷达参考信号,为目标探测提供必备条件.%The passive bistatic radar obtains reference signal by purifying the direct-path signal and the performance of target detection will highly depend on the purity of the reference signal. According to the special structure of digital radio mondiale (DRM) signals, the paper presents a method of generating the reference signal by reconstructing the transmitted signal. Firstly, the process of the reconstruction algorithm based on the modulation and demodulation theories of the DRM signal is introduced. Secondly, the performance of the reconstruction method is verified by real-life signals. Finally, the paper focuses on analyzing the influence of the bit-error rate on the performance of ambiguity function and clutter canceller. The simulation and experimental results show that it is possible to get an ideal reference signal by the reconstruction algorithm and provide a necessary condition for the target detection.
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