Evaluation of BDS-2 real-time orbit and clock corrections from four IGS analysis centers

Ouyang, Chenhao; Shi, Junbo; Huang, Yongshuai; Guo, Jiang; Xu, Chaoqian

doi:10.1016/j.measurement.2020.108441

Cited by 13 publications

(6 citation statements)

References 14 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Step 4 Precise satellite orbit/clock calculation Precise satellite orbit is calculated as: are not identical to those used in IGS RTS (Shi et al, 2015(Shi et al, , 2019Ouyang et al, 2021).…”

Section: Step 2 Iod Matching Between Ppp-b2b Augmentation Messagesmentioning

confidence: 99%

User Implementation and Assessment of BDS-3 Precise Point Positioning Augmentation Service With No Economic Cost

Ouyang,

Shi,

Peng

et al. 2023

ISPRS Ann. Photogramm. Remote Sens. Spatial Inf. Sci.

View full text Add to dashboard Cite

Abstract. The satellite-based precise point positioning (PPP) service enables users with high accuracy positions without Internet connections. Currently, two types of satellite-based PPP services are available. One type is commercial service, such as Trimble CenterPoint RTX service. The second type is non-commercial and cost-free service, including the BDS-3 satellite-based PPP service based on PPP-B2b signals. This service is currently open access to all receiver manufacturers. This contribution firstly presents a detailed instruction on how to apply PPP-B2b signals into positioning. Afterwards, the performance of BDS-3 PPP service is validated with both static and kinematic experiments carried out in Wuhan, China, during day of year 168 and 172, 2022. Results indicate that PPP-B2b signals mainly improve BDS-3 clock precision and GPS orbit accuracy. With BDS-3 PPP-B2b augmentation messages, the static satellite-based PPP shows 3.9/6.9/10.3 mm daily solution repeatability in E/N/U directions, respectively. An average of 13.9 min convergence time and 3.42/2.16/6.65 cm E/N/U positioning accuracy are achieved in the simulated kinematic mode. During a 28-min stepper motor driven movement test, 3.48/14.88 cm 2D/3D kinematic positioning accuracy is obtained using the BDS-3 PPP service.

show abstract

Section: Step 2 Iod Matching Between Ppp-b2b Augmentation Messagesmentioning

confidence: 99%

User Implementation and Assessment of BDS-3 Precise Point Positioning Augmentation Service With No Economic Cost

Ouyang,

Shi,

Peng

et al. 2023

ISPRS Ann. Photogramm. Remote Sens. Spatial Inf. Sci.

View full text Add to dashboard Cite

show abstract

“…As can be observed, all GPS and Galileo satellites had a DA of more than 90%, whereas the majority of BDS satellites had DAs of less than 60%. The major reason for the inferior DAs of BDS satellites can be inferred as the subpar quality of the real-time satellite orbit and the offset products for BDS [37,38], which hinder the generation of the phase bias products in real time.…”

Section: Quality Analysis Of Phase Biasmentioning

confidence: 99%

“…orbit and the offset products for BDS [37,38], which hinder the generation of the phase bias products in real time.…”

Section: Quality Analysis Of Phase Biasmentioning

confidence: 99%

Evaluation of Real-time Precise Point Positioning with Ambiguity Resolution Based on Multi-GNSS OSB Products from CNES

Shu

Xie

et al. 2022

Remote Sensing

View full text Add to dashboard Cite

Ambiguity resolution (AR) is a core technology that helps to speed up convergence time and increase positioning accuracy for precise point positioning (PPP), and the performance of PPP-AR is based on the quality of ambiguity resolution products. Real-time PPP-AR becomes a reality as users can now obtain publicly accessible real-time observable-specific signal bias (OSB) products from the Centre National d’Etudes Spatiales (CNES). Therefore, an analysis of the quality of OSB products and an evaluation of the performance of PPP-AR are required to promote the application of real-time positioning. For a total of 31 days between day of year (DOY) 121 and 151 in 2021, observation data were collected from 90 stations, and the OSB products were used to assess the experiments. As for the quality of the OSB products, the data availability (DA) of the GPS and Galileo satellites was greater than 97%, whereas that of BDS was less than 60%; the maximum fluctuation value (MAX) and standard deviation (STD) of the GPS, Galileo, and BDS satellites were 0.045 and 0.012; 0.081 and 0.028; and 0.292 and 0.085 cycles, respectively. In terms of ambiguity residuals using the OSB products, the wide-lane (WL) residual percentages within ±0.25 cycles for the GPS, Galileo, BDS-2, and BDS-3 systems were more than 92%, and the narrow-lane (NL) residual percentages within ±0.25 cycles for the four systems were 92%, 89%, 79%, and 60%, respectively. With regard to the performance of PPP-AR, the GPS+Galileo solution showed the best performance in the kinematic positioning mode, in which the mean root mean square (RMS) of positioning accuracy was 1.06, 1.27, and 2.85 cm for the east (E), north (N), and up (U) components, respectively, and the mean convergence time reached 9.6 min. In the static positioning mode, the mean convergence times of the GPS-only and GPS+Galileo solutions were 11.4 min and 8.0 min, respectively, and both of their mean RMS for positioning accuracy reached 0.79, 0.95, and 1.48 cm for the E, N, and U components, respectively. However, the addition of BDS did not further enhance the performance of multi-GNSS PPP-AR in either the kinematic or static positioning mode due to the poor quality of the real-time BDS products. More importantly, a prediction method was proposed to avoid re-convergence and to enhance the reliability of PPP-AR in the event of short-time missing real-time OSB products and to improve the positioning accuracy and the ambiguity fixed rate.

show abstract

“…Wang et al [12] and Zhang et al [13] assessed eight analysis centers (ACs) and studied the kinematic PPP results. In addition, RT PPP products from the GFZ, WHU, and CNES were evaluated by Ouyang et al [14].…”

Section: Introductionmentioning

confidence: 99%

Modeling and assessment of Galileo PPP one-way timing with RT-product

Wang,

Xu,

Jiang

et al. 2024

Meas. Sci. Technol.

View full text Add to dashboard Cite

Precise point positioning (PPP) technology is widely used in Positioning, Navigation, and Timing. In order to meet the needs of users for real-time high-precision time information, a real-time Galileo PPP one-way timing model based on existing real-time (RT) products (CAS, CNES, GMV, and WHU) was established and applied for the timing field. Experiments were designed with 8 GNSS stations with an external H-MASER clock to research Galileo PPP timing with 25-day observation. For the modified Allan deviation (MDEV) of Galileo PPP timing solutions, similar to the timing solutions of GPS, the MDEV of Galileo PPP with CAS and CNES shows worse short-term frequency stability, with 1 to 2E-13 at 960 s stability, and indicates similar long-term frequency stability, with about 5 to 6 E-15 at 61440 s stability. For Galileo PPP time transfer, the standard deviation (STD) values are about 0.01 to 0.49 ns for all time-links with different products. For the stability of Galileo time transfer, the similar characteristic of Galileo time transfer is comparable to that of GPS. For short-term stability, the MDEV of all time-links from Gali-leo PPP ranges from 2E14 to 3E-14 at 960 s. For long-term stability, 1 to 2E-15 levels can be reached at 61440 s for all time-links, except for that of CNES.

show abstract

Evaluation of BDS-2 real-time orbit and clock corrections from four IGS analysis centers

Cited by 13 publications

References 14 publications

User Implementation and Assessment of BDS-3 Precise Point Positioning Augmentation Service With No Economic Cost

User Implementation and Assessment of BDS-3 Precise Point Positioning Augmentation Service With No Economic Cost

Evaluation of Real-time Precise Point Positioning with Ambiguity Resolution Based on Multi-GNSS OSB Products from CNES

Modeling and assessment of Galileo PPP one-way timing with RT-product

Contact Info

Product

Resources

About