中文摘要：

针对脉冲位置相位翻转键控（Pulse Position Phase Reversal Keying，3PPK）调制的解调问题，基于时频分析方法，对3PRK信号的伪魏格纳一威利（PWVD）分布特性进行了详细分析，建立了3PRK调制信号相位突变与PWVD分布幅度的关系模型，利用该模型提出了一种新的基于PWVD分布的3PRK调制解调算法，并对该解调算法性能进行了仿真分析。仿真结果验证了该算法的有效性。

英文摘要：

To solve the problem of 3PRK（Pulse Position Phase Reversal Keying） demodulation, the property of PWVD distribution of 3PRK modulation signals is analysed based on time-frequency analysis method. The relation model between abrupt phase change and amplitude of PWVD distribution of 3PRK signals is proposed, and by using this model, a demodulation algorithm for 3PRK based on PWVD distribution is presented. The validity of the algorithm is proved by simulation result.