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This paper presents a regroup method based on reassigned smoothed pseudo Wigner-Ville distribution (RSPWVD) to detect time-varying interference for global navigation satellite system (GNSS) receivers with a single antenna. In order to prove the effectiveness and superiority of the introduced method, the theoretical analysis and performance simulation has been performed between the proposed method and the classical time-frequency analysis methods. The performance of the proposed method has been accessed by experiments with the real BDS B1I signals corrupted by the linear frequency modulation (chirp) interference. The actual performance of experiments has been used to test theoretical analysis by the quantitative metric root mean square error of the instantaneous frequency estimation. The results of experiments depict that the regroup method based on RSPWVD completely eliminates not only cross-term interferences but also end effects and provide better detection performance of time-varying interference compared with the classical time-frequency analysis methods for GNSS receivers with a single antenna.

An Improved Method Based on Time-Frequency Distribution to Detect Time-Varying Interference for GNSS Receivers With Single Antenna