Abstract
In this paper, a joint method combining Hough transform and reassigned smoothed pseudo Wigner-Ville distribution (RSPWVD) is presented to detect time-varying interferences with crossed frequency for a Global Navigation Satellite System (GNSS) receiver with a single antenna. The proposed method can prevent the cross-term interference and detect the time-varying interferences with crossed frequency which cannot be achieved by the classical time-frequency (TF) analysis with the peak detection method. The actual performance of the developed method has been evaluated by experiments with conditions where the real BeiDou system (BDS) B1I signals are corrupted by the simulated chirp interferences. The results of experiments show that the introduced method is effectively able to detect chirp interferences with crossed frequency and provide the same root mean square errors (RMSE) of the parameter estimation for chirp one and the improved initial frequency estimation for chirp two compared with the Hough transform of Wigner-Ville distribution (WVD) when the jamming to noise ratio (JNR) equals or surpasses 4 dB.
Highlights
At present, Global Navigation Satellite System (GNSS) receivers with a single antenna are threatened by a serious jamming environment where many GNSS receiver failures occurred [1,2,3], limiting the GNSS applications
Conclusions where the real BeiDou system (BDS) B1I signals corrupted by the simulated chirp interferences are collected by the
This paper presents a joint method based on the Hough transform of reassigned smoothed pseudo Wigner-Ville distribution (RSPWVD) to detect
Summary
GNSS receivers with a single antenna are threatened by a serious jamming environment where many GNSS receiver failures occurred [1,2,3], limiting the GNSS applications. TF domain methods adopt the classical TF analysis including short-time Fourier transform (STFT), Wigner-Ville distribution (WVD) and RSPWVD [8], which illustrate that jamming signals usually focus their energy in a finite area of the TF plane, while noise power extends over the whole TF plane [9]. These TF methods cannot deal with the time-varying interferences with crossed frequency by the peak detection method [18]. The effect of sweep period on the estimation of initial frequency and chirp rate has been analyzed
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