基于时域和频域2种循环谱密度估计方法，研究和总结了多相编码信号的循环谱特征及其与信号参数的关系。提出了一种没有先验知识条件下多相编码信号参数提取方法。首先介绍了多相编码信号的表示形式，然后使用循环谱密度函数估计方法分析了信号的循环谱特征，在此基础上提出了基于循环谱特征的信号参数提取方法。通过对6个典型多相编码信号参数提取相对误差的计算，验证了该算法的有效性。%Based on two cyclic spectral density estimating methods on time and frequency domain, the cyclic spectral features of frank coded signals are studied and the correspondence with signal parameters is investigated. A polyphase coded signal parameter extraction method without prior knowledge is developed. Firstly, the expression of polyphase coded signal is described ; secondly, the cyclic spectral features of signals are analyzed by using cyclic spectral density estimating method. Based on the above analysis, a method for parameter extraction based on cyclic spectral features is proposed. The relative errors of six typical signals parameter extractions are measured to verify the validity of the method.
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