Analysis and Correction of BDS Code Multipath Bias

Yang, Wensheng; Tong, Haibo; Pan, Lei; Xu, Donghui; Guo, Wenpu; Yang, Jian

doi:10.1007/978-981-10-0940-2_44

Cited by 10 publications

(6 citation statements)

References 8 publications

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“…Studies of the BDS multipath error have become of particular interest in recent years due to the presence of satellite-related code multipath biases in comparison with other GNSS systems, which can be well modeled as piecewise linear or polynomials associated with elevation angles for MEOs and IGSOs based on BDS data from ground stations (Wanninger and Beer 2015;Yang et al 2016). However, with onboard tracking data, the observation coverage in the sky plot can be much more complete, which can help to further reveal the BDS multipath errors relating to elevations as well as azimuths.…”

Section: Multipath Errormentioning

confidence: 99%

Precise orbit determination of the Fengyun-3C satellite using onboard GPS and BDS observations

Shi

et al. 2017

J Geod

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The GNSS Occultation Sounder instrument onboard the Chinese meteorological satellite Fengyun-3C (FY-3C) tracks both GPS and BDS signals for orbit determination. One month's worth of the onboard dual-frequency GPS and BDS data during March 2015 from the FY-3C satellite is analyzed in this study. The onboard BDS and GPS measurement quality is evaluated in terms of data quantity as well as code multipath error. Severe multipath errors for BDS code ranges are observed especially for high elevations for BDS medium earth orbit satellites (MEOs). The code multipath errors are estimated as piecewise linear model in 2 • ×2 • grid and applied in precise orbit determination (POD) calculations. POD of FY-3C is firstly performed with GPS data, which shows orbit consistency of approximate 2.7 cm in 3D RMS (root mean square) by overlap comparisons; the estimated orbits are then used as reference orbits for evaluating the orbit precision of GPS and BDS combined POD as well as BDS-based POD. It is indicated that inclusion of BDS geosynchronous orbit satellites (GEOs) could degrade POD precision seriously. The precisions of orbit estimates by combined POD and BDS-based POD are 3.4 and 30.1 cm in B Wenwen Li 3D RMS when GEOs are involved, respectively. However, if BDS GEOs are excluded, the combined POD can reach similar precision with respect to GPS POD, showing orbit differences about 0.8 cm, while the orbit precision of BDSbased POD can be improved to 8.4 cm. These results indicate that the POD performance with onboard BDS data alone can reach precision better than 10 cm with only five BDS inclined geosynchronous satellite orbit satellites and three MEOs. As the GNOS receiver can only track six BDS satellites for orbit positioning at its maximum channel, it can be expected that the performance of POD with onboard BDS data can be further improved if more observations are generated without such restrictions.

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Section: Multipath Errormentioning

confidence: 99%

Precise orbit determination of the Fengyun-3C satellite using onboard GPS and BDS observations

Shi

et al. 2017

J Geod

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“…BDS‐2 differs from other GNSS systems in that there are obvious code multipath errors related to elevation angle [30]. Generally, the code multipath error of BDS‐2 can be analysed by the multipath combination equations which are combined by code and dual‐frequency carrier phase observations [31–33].

M{P}_{i}={P}_{i}-\frac{{f}_{i}^{2}+{f}_{j}^{2}}{{f}_{i}^{2}-{f}_{j}^{2}}\hspace*{.5em}{\lambda }_{i}{\varphi }_{i}+\frac{2{f}_{j}^{2}}{{f}_{i}^{2}-{f}_{j}^{2}}\hspace*{.5em}{\lambda }_{j}{\varphi }_{j}-{B}_{i}

{B}_{i}=-\frac{{f}_{i}^{2}+{f}_{j}^{2}}{{f}_{i}^{2}-{f}_{j}^{2}}\hspace*{.5em}{\lambda }_{i}{N}_{i}+\frac{2{f}_{j}^{2}}{{f}_{i}^{2}-{f}_{j}^{2}}\hspace*{.5em}{\lambda }_{j}{N}_{j}+{D}_{c}

where, different frequencies are indicated by subscripts i and j ; the frequencies of carrier phases are referred to

{f}_{i}

and

{f}_{j}

;

{P}_{i}

denotes the code observation;

{\varphi }_{i}

and

φ_{j}

…”

Section: Methodology Of Fy‐3c/3d Pod and Code Multipath Errormentioning

confidence: 99%

“…Moreover, the absolute value of the carrier phase multipath error cannot exceed one quarter of the wavelength, that is, for BDS‐2 the multipath errors on the B1 and B2 carrier phases cannot exceed 4.8 and 6.21 cm respectively. These values are two orders of magnitude smaller than the code multipath errors, so the effect of carrier phases multipath errors is ignored in this paper [33].…”

Section: Methodology Of Fy‐3c/3d Pod and Code Multipath Errormentioning

confidence: 99%

Real‐time precise orbit determination for FY‐3C and FY‐3D based on BDS and GPS onboard observation

Wang

et al. 2023

IET Radar Sonar & Navi

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The code multipath error associated with elevation in BDS‐2 is one of the main factors whose impact on the precision of real‐time reduced‐dynamic precise orbit determination (POD) using spaceborne multi‐global navigation satellite systems (GNSS) observation data for FengYun‐3C (FY‐3C) and FengYun‐3D (FY‐3D) satellites. The aim is to construct a code multipath piece‐wise linear error model and analyse the contribution of BDS‐2 to the performance of low earth orbit POD. Conclusions are drawn out from the experimental results: (1) the real‐time POD average precision of FY‐3C and FY‐3D is improved by about 11% and 12% after the correction of BDS‐2 code multipath error; (2) Due to the small number of available BDS‐2 satellites and the limited accuracy of geostationary earth orbit (GEO) satellite real‐time orbit products, the precision of the real‐time overlapping comparison for FY‐3C/FY‐3D by using the BDS‐2 onboard observation data can only reach the decimetre level. However, with the BDS‐2 signal capture capability of the FY‐3D onboard GNSS Occultation Sounder upgraded, the average precision of the BDS‐2‐based POD for FY‐3D is better than that of FY‐3C in each direction and with 10% improvement in the average 3 dimensional‐root mean square (3D‐RMS); (3) Cases of onboard global positioning system (GPS), GPS + BDS‐2 (with GEO), and GPS + BDS‐2 (without GEO) for real‐time POD can meet 5–8 cm precision requirement. The average 3D‐RMS of the real‐time POD for FY‐3C/FY‐3D, which utilises onboard GPS + BDS‐2 data is inferior only to GPS data, owing to the influence of the orbit accuracy of GEO satellites. However, after excluding the influence of GEO satellites, the average result (3D‐RMS) of the real‐time POD for FY‐3C (6.11 cm) and FY‐3D (5.95 cm) is better than those of other cases.

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“…The CMC approach was also used by several groups to study the large GDV of the BeiDou-2 satellites (Hauschild et al 2012a;Wanninger and Beer 2015;Yang et al 2016;Guo et al 2016;Zou et al 2017). For frequency B1-2, they amount to 1.5 m in the case of the medium earth orbit (MEO) satellites and 0.8 m in the case of the inclined geosynchronous orbit (IGSO) satellites.…”

Section: Previous Work On Gdvmentioning

confidence: 99%

Estimation of absolute GNSS satellite antenna group delay variations based on those of absolute receiver antenna group delays

2021

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GNSS satellite and receiving antennas exhibit group delay variations (GDV), which affect code pseudorange measurements. Like antenna phase center variations, which affect phase measurements, they are frequency-dependent and vary with the direction of the transmitted and received signal. GNSS code observations contain the combined contributions of satellite and receiver antennas. If absolute GDV are available for the receiver antennas, absolute satellite GDV can be determined. In 2019, an extensive set of absolute receiver antenna GDV was published and, thus, it became feasible to estimate absolute satellite antenna GDV based on terrestrial observations. We used the absolute GDV of four selected receiver antenna types and observation data of globally distributed reference stations that employ these antenna types to determine absolute GDV for the GPS, GLONASS, Galileo, BeiDou, and QZSS satellite antennas. Besides BeiDou-2 satellites whose GDV are known to reach up to 1.5 m peak-to-peak, the GPS satellites show the largest GDV at frequencies L1 and L5 with up to 0.3 and 0.4 m peak-to-peak, respectively. They also show the largest satellite-to-satellite variations within a constellation. The GDV of GLONASS-M satellites reach up to 25 cm at frequency G1; Galileo satellites exhibit the largest GDV at frequency E6 with up to 20 cm; BeiDou-3 satellites show the largest GDV of around 15 cm at frequencies B1-2 and B3. Frequencies L2 of GPS IIIA, E1 of Galileo FOC, and B2a/B2b of BeiDou-3 satellites are the least affected. Their variations are below 10 cm.

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Analysis and Correction of BDS Code Multipath Bias

Cited by 10 publications

References 8 publications

Precise orbit determination of the Fengyun-3C satellite using onboard GPS and BDS observations

Precise orbit determination of the Fengyun-3C satellite using onboard GPS and BDS observations

Real‐time precise orbit determination for FY‐3C and FY‐3D based on BDS and GPS onboard observation

Estimation of absolute GNSS satellite antenna group delay variations based on those of absolute receiver antenna group delays

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