Performance Assessment of BDS Real-Time Precise Point Positioning Based on SSR Corrections

Shi, Yishuai; Jinming, Hao; Liu, Weiping; Jiao, Bo; Zhang, Hui; Song, Baofeng

doi:10.1061/(asce)su.1943-5428.0000281

Cited by 11 publications

(5 citation statements)

References 17 publications

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“…which O p indicates the precise orbit; (e r , e a , e c ) presents the transformation matrix; O b illustrates the satellite orbits calculated using broadcast ephemeris; ∆O displays the SSR correction; Ṙ and R indicates the velocity and position of the satellite. The recovery precise clock is written as [26]:…”

Section: Precise Products Recoveredmentioning

confidence: 99%

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

Wang,

Xu,

Jiang

et al. 2024

Meas. Sci. Technol.

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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.

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Section: Precise Products Recoveredmentioning

confidence: 99%

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

Wang,

Xu,

Jiang

et al. 2024

Meas. Sci. Technol.

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“…In summary, the PPP performance is only affected by O s a and T s a . The accuracy of BDS GEO orbit products is over five times worse than that of IGSO and MEO orbit products [21,25]. In the real-time clock estimation, the ultra-rapid orbit products are usually used to fix the satellite coordinates, and the orbital errors can be partially assimilated by the clock offsets [22][23][24].…”

Section: Model Of Real-time Bds Clock Productmentioning

confidence: 99%

“…In the real-time clock estimation, the ultra-rapid orbit products are usually used to fix the satellite coordinates, and the orbital errors can be partially assimilated by the clock offsets [22][23][24]. Besides, the discontinuities of the orbital errors will also cause clock discontinuities due to the high correlation between the radial orbit and clock offset [20,21]. In other words, the clock discontinuity can be regarded as another effect caused by the assimilated orbital errors.…”

Section: Model Of Real-time Bds Clock Productmentioning

confidence: 99%

“…Although many efforts have been made to assess the precision of IGS legacy or multi-GNSS experiment (MGEX) products [13][14][15][16][17][18][19], including real-time BDS clock products [11,12,20,21], few studies paid attention to the impact of orbital errors on the evaluation results. In the precise clock estimation, the orbital errors are partially assimilated in the clock offsets [22][23][24].…”

Section: Introductionmentioning

confidence: 99%

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An Improved Multi-Satellite Method for Evaluating Real-Time BDS Satellite Clock Offset Products

et al. 2020

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Two methods are widely used for evaluating the precision of satellite clock products, namely the single-satellite method (SSM) and the multi-satellite method (MSM). In the satellite clock product evaluation, an important issue is how to eliminate the timescale difference. The SSM selects a reference satellite to eliminate the timescale difference by between-satellite differencing, but its evaluation results are susceptible to the gross errors in the referenced satellite clock offsets. In the MSM, the timescale difference is first estimated and then removed. Unlike the GPS, the BeiDou Navigation Satellite System (BDS) consists of three types of satellites, namely geosynchronous earth orbit (GEO), inclined geosynchronous orbit (IGSO), and medium earth orbit (MEO) satellites. The three types of satellites have uneven orbital accuracy. In the generation of satellite clock products, the orbital errors are partly assimilated into the clock offsets. If neglecting the orbital accuracy difference of the three types of BeiDou satellites, the MSM will obtain biased estimates of the timescale difference and finally affect the clock product evaluation. In this study, an improved multi-satellite method (IMSM) is proposed for evaluating the real-time BDS clock products by removing the assimilated orbital errors of the three types of BDS satellites when estimating the timescale difference. Three real-time BDS clock products disseminated by three different International GNSS Service (IGS) analysis centers, namely CLK16, CLK20, and CLK93, over a period of two months are used to validate this method. The results indicate that the assimilated orbital errors have a significant impact on the estimation of the timescale difference. Subsequently, the IMSM is compared with the SSM in which the referenced satellite is rigorously chosen, and their RMS difference is only 0.08 ns, which suggests that the evaluation results obtained by the IMSM are accurate. Compared with the traditional MSM, the IMSM improves the RMS by 0.16, 0.11, and 0.07 ns for CLK16, CLK20, and CLK93, respectively. Finally, three real-time BDS clock products are evaluated using the proposed method, and results reveal a significant precision difference among them.

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“…With the rapid development of BDS, BDS-based RTPPP has been receiving more attention. Since the CNES became the first organization to provide RTS for BDS satellites in November 2015, organizations such as GFZ and DLR have also begun to release RTS for BDS satellites [10]- [13].…”

mentioning

confidence: 99%

Decoding PPP Corrections From BDS B2b Signals Using a Software-Defined Receiver: An Initial Performance Evaluation

Chen

Shen

et al. 2021

IEEE Sensors J.

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With the rapid development of China's BeiDou Navigation Satellite System (BDS), the application of real-time precise point positioning (RTPPP) based on BDS has become an active research area in the field of Global Navigation Satellite Systems (GNSS). BDS has provided the service of broadcasting RTPPP information. It indicates that BDS has become the second satellite system that provides RTPPP services, following Galileo among the GNSS, but work based on this direction has yet to be explored. Therefore, this paper evaluates the performance of precise point positioning (PPP) service using a software-defined receiver (SDR). An experiment was carried out to verify the feasibility of the SDR. The PPP-B2b signal was processed to obtain PPP service information, including orbit corrections, clock corrections, and differential code bias corrections. The timevarying attributes of these corrections of BDS and GPS are evaluated, and the integrity and stability of the PPP service were analyzed. The results show the PPP-B2b signal can stably provide PPP services for satellites in the Asia-Pacific region, including centimeter to decimeter-level orbit corrections and meter-level clock corrections for BDS satellites. At the same time, PPP services provide decimeter to meter-level orbit correction and meter-level clock correction for GPS satellites. Finally, detection tip for bitstream availability in SDR is proposed. Some content which is not defined in the official document, such as the PPP-B2b frame arrangement, various correction update cycles and the progress of PPP service are discussed. INDEX TERMS Real-time precise point positioning (RTPPP); BeiDou Navigation Satellite System (BDS); Signal processing; Software-defined receiver (SDR). I. INTRODUCTION The development of Chinese BeiDou navigation satellite system (BDS) can be divided into three steps. The first step was to construct the BeiDou Satellite Navigation Demonstration System (BDS-1) [1]. Using an active positioning scheme, the system provided users in China with positioning, timing, wide-area differential and short message communication services. Since 2003, the third BeiDou navigation experiment satellite was launched, further enhancing the performance of the BeiDou Navigation Satellite Demonstration System [2]. The second step was the construction of the BeiDou Satellite Navigation Regional System (BDS-2). In addition to a technical scheme compatible with that of BDS-1, BDS-2 further included a passive positioning scheme, and provided users in the Asia-Pacific region with positioning, velocity measurement, timing, and short message communication

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Performance Assessment of BDS Real-Time Precise Point Positioning Based on SSR Corrections

Cited by 11 publications

References 17 publications

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

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

An Improved Multi-Satellite Method for Evaluating Real-Time BDS Satellite Clock Offset Products

Decoding PPP Corrections From BDS B2b Signals Using a Software-Defined Receiver: An Initial Performance Evaluation

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