A Design Method of Code Correlation Reference Waveform in GNSS Based on Least-Squares Fitting.

Chengtao Xu,Xiaomei Tang,Zhe Liu,Feixue Wang

doi:10.3390/s16081194

Chengtao Xu, Xiaomei Tang + Show 2 more

Open Access

https://doi.org/10.3390/s16081194

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Abstract

The multipath effect is one of the main error sources in the Global Satellite Navigation Systems (GNSSs). The code correlation reference waveform (CCRW) technique is an effective multipath mitigation algorithm for the binary phase shift keying (BPSK) signal. However, it encounters the false lock problem in code tracking, when applied to the binary offset carrier (BOC) signals. A least-squares approximation method of the CCRW design scheme is proposed, utilizing the truncated singular value decomposition method. This algorithm was performed for the BPSK signal, BOC(1,1) signal, BOC(2,1) signal, BOC(6,1) and BOC(7,1) signal. The approximation results of CCRWs were presented. Furthermore, the performances of the approximation results are analyzed in terms of the multipath error envelope and the tracking jitter. The results show that the proposed method can realize coherent and non-coherent CCRW discriminators without false lock points. Generally, there is performance degradation in the tracking jitter, if compared to the CCRW discriminator. However, the performance promotions in the multipath error envelope for the BOC(1,1) and BPSK signals makes the discriminator attractive, and it can be applied to high-order BOC signals.

Highlights

The binary offset carrier (BOC) signal, which is adopted by modernized GPS, GLONASS, Galileo and BeiDou satellite navigation systems [1,2,3], is designed for spectrum separation and ranging accuracy improvement
Two problems emerge in the application of BOC signals, which are the ambiguity in receiver tracking and the lack of multipath mitigation methods [7]
The process for the binary phase shift keying (BPSK)(1) signal can be applied to BPSK(n) signals with the same ratio between the chip rate and the bandwidth

Summary

Introduction

The binary offset carrier (BOC) signal, which is adopted by modernized GPS, GLONASS, Galileo and BeiDou satellite navigation systems [1,2,3], is designed for spectrum separation and ranging accuracy improvement. In modern Global Navigation Satellite Systems (GNSSs), the BOC signal is widely used for civil and military applications These novel signals can improve the tracking accuracy and have better multipath mitigation performance with narrow correlators, when compared to the binary phase shift keying (BPSK) signal. Two problems emerge in the application of BOC signals, which are the ambiguity in receiver tracking and the lack of multipath mitigation methods [7]

Results

Discussion

Conclusion