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针对直接序列扩频信号在通信、导航和雷达等应用中具有低信噪比和低截获概率等特点,给信号侦察带来很大困难,提出了一种基于延时相乘结构的载波信号最佳检测方法。通过推导检测器的输出信噪比,研究了延时、带宽和输出信噪比的关系,得到了最优的参数设置方法。分析表明:在已知部分参数下,延时为零而且匹配滤波时检测器性能最佳;在未知参数条件下,当延时与带宽之积为0.4时,检测器性能达到最佳。在此基础上,分析了检测器的性能,并通过仿真实验验证了提出方法的有效性。
In view of the low signal-to-noise ratio and low probability of interception of direct sequence spread spectrum signals in applications such as communication, navigation and radar, it brings great difficulty to signal reconnaissance. A carrier signal based on delay multiplication structure Good detection method. By deriving the output signal to noise ratio of the detector, the relationship between delay, bandwidth and output signal to noise ratio is studied and the optimal parameter setting method is obtained. The analysis shows that under some known parameters, the detector has the best delay when the delay is zero and the matched filter is the best. When the product of the delay and the bandwidth is 0.4, the performance of the detector reaches the best under unknown parameters. On this basis, the performance of the detector is analyzed, and the effectiveness of the proposed method is verified through simulation experiments.