为了解决航空无线电导航服务频段附近的脉冲干扰影响接收机工作的问题，并进一步提高GNSS系统的抗干扰能力，提出了基于STFRFT(Short Time Fractional Fourier Transform)的脉冲干扰抑制方法。该方法首先确定接收信号的最佳旋转阶次，再对信号进行STFRFT，通过坐标旋转得到时频面的二维分布，在最佳阶次下采用自适应时变滤波器实现对干扰和信号的分离进而抑制干扰。仿真结果表明，该算法在抑制脉冲干扰的同时保留了更多了有用信号，提高了干扰抑制能力。
In order to solve the problem that the pulse interference near the service frequency band of aviation radio navigation affects the receiver, and further improve the anti-jamming ability of GNSS system, a pulse interference suppression method based on STFRFT(short time fractional Fourier transform) is proposed. This method determines the best rotation order of the received signal, and then STFRFT is applied to the signal to obtain the two-dimensional distribution of time-frequency surface through coordinate rotation. Under the optimal order, the adaptive time-varying filter is used to separate the interference and signal, and then the interference is suppressed. The simulation results show that the algorithm retains more useful signals and improves the ability of interference suppression.