Abstract
The Precise Point Positioning (PPP) service of BeiDou-3 Navigation Satellite System (BDS-3) is implemented on its Geostationary Earth Orbit (GEO) satellites. However, its signal design is limited by the actual power of satellite and other conditions. Furthermore, the design needs to fully consider the compatibility of different service phases. Starting from the actual state of the BDS-3 GEO satellite, this paper studies the multiplexing modulation of the BDS PPP service signal that is based on the Asymmetric Constant Envelope Binary Offset Carrier (ACE-BOC) technique and proposes several feasible schemes for this signal. Comparison and optimization of these techniques are made from the aspects of transmission efficiency, multiplexing efficiency, and service forward compatibility. Based on the Type-III ACE-BOC multiplexing modulation technique, phase rotation and intermodulation reconstruction techniques are proposed to suppress the intermodulation interference issue. Finally, a signal based on improved ACE-BOC multiplexing is designed. The quality of the proposed signal was continuously monitored and tested using large-diameter antennas. The evaluation results show that the power spectrum deviation of the signal is 0.228 dB, the correlation loss is 0.110 dB, the S-curve slope deviation is 1.558% on average, the average length difference between the positive/negative chip and the ideal chip is only 0.0006 ns, and the coherence between the carrier and the pseudo code is 0.082°. All quality indicators are satisfactory, indicating that the proposed signal multiplexing modulation technique is an ideal solution that meets all the requirements of the design constraints, and can achieve efficient information broadcasting and forward compatibility of the BDS PPP service.
Highlights
Precise Point Positioning (PPP) has the characteristics of wide service coverage, uniform accuracy distribution, and a small number of ground reference stations needed (Héroux & Kouba, 2001; Jin & Su, 2020)
Starting from the current actual state of the BeiDou-3 Navigation Satellite System (BDS-3) Geostationary Earth Orbit (GEO) satellite, this paper explores PPP service signals based on the Asymmetric Constant Envelope Binary Offset Carrier (ACE-BOC) multiplexing technique (Yao et al, 2016)
The PPP service based on the B2b band of GEO satellites is one of the important services of BeiDou Navigation Satellite System (BDS)-3, and is an important measure for BeiDou to improve its highprecision service capabilities
Summary
Precise Point Positioning (PPP) has the characteristics of wide service coverage, uniform accuracy distribution, and a small number of ground reference stations needed (Héroux & Kouba, 2001; Jin & Su, 2020). Starting in 2020, BDS-3 uses the PPP-B2b signal in-phase component from the first three GEO satellites to provide open high-precision positioning services with a data rate of 500 bit/s for the users in China and surrounding areas.
Sign-in/Register to view highlights & summary Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
