基于Radon-STFT的DSSS系统线性调频干扰抑制

Linear Frequency Modulation Interference Detection and Suppression Based on Radon-STFT in Direct Sequence Spread Spectrum System

摘要: 提出了一种基于R adon-短时傅里叶变换(R adon-STFT)的直接序列扩频(DSSS)系统线性调频干扰的抑制方法.该方法只需估计得到线性调频干扰信号的初始频率和调频率即可进行有效的干扰抑制,使干扰抑制过程的复杂程度大为降低.性能分析和仿真实验表明,该方法可以在较大的动态范围内有效地抑制线性调频干扰.与基于STFT的抑制算法相比,其参数估计精度提高;与基于WHT的抑制算法相比,该方法在多分量条件下效果更为突出.

Abstract: A linear frequency modulation(LFM) interference suppression method in direct sequence spread spectrum(DSSS) receiver based on Radon-STFT is proposed.The method can restrain LFM interference by the initial frequency and chirp rate,making the process of interference suppression more easy.Performance analyses and simulation results showed that the proposed method works effectively in a large dynamic range.Compared with the STFT-based algorithm,it is more accurate.Compared with the WHT-based algorithm,it is more efficient especially in conditions of multicomponent LFM interferences.