Linear frequency modulation interference detection and suppression based on radon-STFT in direct sequence spread spectrum system

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.