Abstract
The establishment of the BeiDou global navigation satellite system (BDS-3) has been completed, and the current constellation can independently provide positioning service globally. BDS-3 satellites provide quad-frequency signals, which can benefit the ambiguity resolution (AR) and high-precision positioning. This paper discusses the benefits of quad-frequency observations, including the precision gain of multi-frequency high-precision positioning and the sophisticated choice of extra-wide-lane (EWL) or wide-lane (WL) combinations for instantaneous EWL/WL AR. Additionally, the performance of EWL real-time kinematic (ERTK) positioning that only uses EWL/WL combinations is investigated. The results indicate that the horizontal positioning errors of ERTK positioning using ionosphere-free (IF) EWL observations are approximately 0.5 m for the baseline of 27 km and 1 m for the baseline of 300 km. Furthermore, the positioning errors are reduced to the centimetre level if the IF EWL observations are smoothed by narrow-lane observations for a short period.
Highlights
The BeiDou Navigation Satellite System (BDS) is one of the four global satellite navigation systems (GNSSs)
The BeiDou regional navigation satellite system (BDS-2), which currently consists of five geostationary earth orbit (GEO) satellites, seven Inclined GeoSynchronous Orbit (IGSO) satellites, and three Medium Earth Orbit (MEO) satellites, can provide Positioning, Navigation, and Timing (PNT) services in the Asia Pacific Region
This paper examines the benefits of these quad-frequency signals with regard to Ambiguity Resolution (AR) and positioning
Summary
The BeiDou Navigation Satellite System (BDS) is one of the four global satellite navigation systems (GNSSs). The second constellation, which is called BeiDou Regional Navigation Satellite System (BDS-2), was completed and put into service in July 2012. The third constellation, which is called BeiDou Global Navigation Satellite System (BDS-3), currently consists of three GEO satellites, three IGSO satellites,. BDS-2 satellites broadcast triple-frequency signals, i.e. B1I, B2I, and B3I, which are centred at 1561.098, 1207.140, and 1268.520 MHz, respectively. BDS-3 satellites broadcast five-frequency signals, i.e. B1I, B3I, B1C, B2a, and B2b; B1C, B2a, and B2b are centred at 1575.420, 1176.450, and 1207.140 MHz, respectively. Among these five signals of BDS-3 satellites, only B1I, B1C, B2a, and B3I are officially available for public service as of June 21, 2020.
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