Abstract: Based on the analysis of ambiguity function and its characters about random frequency-hopping signal，the relation of rectangular kernel function which can be used in time-frequency analysis and signal ambiguity function is given，and a new time-frequency representation method is proposed.Theoretical deduction and simulation results show that it is effective to analyze fast frequency-hopping signal using this method.Compared with Smoothed Pseudo Wigner-Ville Distribution（SPWVD），this algorithm can reduce the cost of computation，save operation time under the situation that keep approximate performance and is suitable for real-time analyzing.

摘要： 在分析随机跳频信号模糊函数及其特性的基础上，给出了用于时频分析的矩形核函数与信号模糊平面的关系，提出了一种新的时频表示方法。理论推导和仿真结果表明该方法能够有效地分析随时间快速跳变的跳频信号。与平滑伪维格纳分布相比，在保持相似性能的情况下，该算法运算量比较小，可以有效地节约运算时间，适合于快速跳频信号的实时分析。