為了解決航空無線電導航服務頻段附近的脈沖干擾影響接收機工作的問題，并進一步提高GNSS系統的抗干擾能力，提出了基于STFRFT(Short Time Fractional Fourier Transform)的脈沖干擾抑制方法。該方法首先確定接收信號的最佳旋轉階次，再對信號進行STFRFT，通過坐標旋轉得到時頻面的二維分布，在最佳階次下采用自適應時變濾波器實現對干擾和信號的分離進而抑制干擾。仿真結果表明，該算法在抑制脈沖干擾的同時保留了更多了有用信號，提高了干擾抑制能力。
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.