Orbit determination and time synchronization for new-generation Beidou satellites: Preliminary results

Chen, Jinping; Hu, Xiaogong; Tang, Chengpan; Zhou, Shanshi; Guo, Rui; Pan, Junyang; Li, Ran; Zhu, LinFeng

doi:10.1360/sspma2016-00281

Cited by 24 publications

(4 citation statements)

References 3 publications

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“…The ISLs refer to the effective expansion of the telemetry, tracking, and command (TT&C) and communications range of ground stations [4,5] by establishing communication and measurement links between satellites. On the one hand, measurements via ISLs can effectively improve orbit determination and time synchronization performance in GNSSs; on the other hand, ground stations can control satellites that cannot be directly linked to ground stations [6].…”

Section: Introductionmentioning

confidence: 99%

Carrier Phase Dual One-Way Ranging Method Based on a Frequency Hopping Signal

Zhang,

Feng,

Wang

et al. 2024

Remote Sensing

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With the development of navigation satellite constellation systems, to improve navigation service and orbit determination performance, the accuracy requirements for maintaining temporal references have increased rapidly. Among the current navigation satellites, a dual one-way ranging (DOWR) approach based on intersatellite links (ISLs) is widely adopted in the BeiDou system and global positioning system (GPS) to transmit satellite time reference information. However, the accuracy of DOWR is restricted by the pseudonoise (PN) code rate. To improve the accuracy of DOWR, the PN code measurement must be replaced by the carrier phase measurement. This paper introduces an algorithm that utilizes frequency hopping to achieve carrier phase ranging. In addition to the high-precision advantages of carrier phase measurements, the anti-interference performance of the ranging signal is also improved due to the characteristics of the frequency hopping signal itself. Ultimately, at a carrier-to-noise ratio of 40 dB-Hz, the measurement accuracy is 9.54 μm, while the PN code measurement accuracy in the same environment is 0.13 m. As the carrier-to-noise ratio increases, the measurement accuracy further improves.

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Section: Introductionmentioning

confidence: 99%

Carrier Phase Dual One-Way Ranging Method Based on a Frequency Hopping Signal

Zhang,

Feng,

Wang

et al. 2024

Remote Sensing

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“…Among them, the correction methods for some error sources are relatively mature, such as the tropospheric delay correction and multipath and noise smoothing, but pseudorange bias correction has not been widely recognized. Although most of the error sources are as same as the Radio Navigation Satellite System (RNSS) [25], the indicator of the BDSBAS (H:1 m/1.5 m V:1.5 m/2 m) is more demanding then RNSS (3D:10 m). Therefore, we need to clarify the impact of these errors on the service.…”

Section: Introductionmentioning

confidence: 99%

Pseudorange Bias Analysis and Preliminary Service Performance Evaluation of BDSBAS

et al. 2021

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To satisfy the demands of civil aviation organizations and other users of satellite navigation systems for high-precision and high-integrity service performance, many countries and regions have established satellite-based augmentation systems (SBAS) referring to the Radio Technical Commission for Aeronautics (RTCA) service standards and agreements. The BeiDou SBAS (BDSBAS) provides both single-frequency service, which augments Global Positioning System (GPS) L1 C/A signal, and dual-frequency multi-constellation (DFMC) service, which augments BeiDou Navigation Satellite System (BDS) B1C and B2a dual frequency signals presently, meeting the requirements of the RTCA DO-229D protocol and the SBAS L5 DFMC protocol requirements, respectively. As one of the main error sources, the pseudorange bias errors of BDSBAS monitoring receivers were estimated and their effect on the performance of the BDSBAS service was analyzed. Based on the user algorithms of SBAS differential corrections and integrity information, the service accuracy, integrity, and availability of the BDSBAS were evaluated using real observation data. The results show that the maximum of monitoring receiver pseudorange bias errors between L1P and L1P/L2P can reach 1.57 m, which become the most important errors affecting the performance of the BDSBAS service. In addition, the results show that the pseudorange bias of GPS BlockIII is the smallest, while that of GPS BlockIIR is the largest. Compared with the positioning accuracy of the open service of the core constellation, the positioning accuracy of the BDSBAS service can be improved by approximately 47% and 36% for the RTCA service and DFMC service, respectively. For RTCA services, the protection limit (PL) calculated with the integrity information can 100% envelop the positioning error (PE) and no integrity risk event is detected. The service availability of BDSBAS for APV-I approach is approximately 98.8%, which is mainly affected by the availability of ionospheric grid corrections in the service marginal area. For DFMC service, the integrity risk is not detected either. The service availability for CAT-I approach is 100%. Improving the availability of ionospheric grid corrections is one of the important factors to improve service performance of BDSBAS RTCA service.

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“…Results showed that the three-dimensional root-mean-square error (3D RMS) of the BDS-2's one-day overlapping arc for MEO (and IGSO) and GEO were improved from 0.5 m and 3.0 m to 0.2 m and 1.0 m, respectively. Moreover, the BDS-3 orbit and clock determination is focused on the following three aspects: (1) analyses of the precision, accuracy, and quality of BDS-3 observations and products, respectively [14,15];…”

Section: Introductionmentioning

confidence: 99%

“…(2) assessment of the impact of introducing inter-satellite links on precise BDS-3 orbit and clock offset determination [14,16,17]; (3) stacking the satellite-ground link and satellite-to-satellite cross-link observations in BDS-3 orbit determination [18]. Similarly, the results indicate that the radial and along-track directions of one-day orbit overlapping (the discrepancy of arcs based on two adjacent orbit determination processes) were improved from 10.0 cm and 25.0 cm to 3.7 cm and 7.9 cm, respectively, and the frequency stability of theonboard clock also increased by more than 10 times for BDS-3 experimental satellites [15,19].…”

Section: Introductionmentioning

confidence: 99%

A BDS-2/BDS-3 Integrated Method for Ultra-Rapid Orbit Determination with the Aid of Precise Satellite Clock Offsets

Wang

Zhang

2019

Remote Sensing

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The accuracy of ultra-rapid orbits is a key parameter for the performance of GNSS (Global Navigation Satellite System) real-time or near real-time precise positioning applications. The quality of the current BeiDou demonstration system (BDS) ultra-rapid orbits is lower than that of GPS, especially for the new generational BDS-3 satellites due to the fact that the availability of the number of ground tracking stations is limited, the geographic distribution of these stations is poor, and the data processing strategies adopted are not optimal. In this study, improved data processing strategies for the generation of ultra-rapid orbits of BDS-2/BDS-3 satellites are investigated. This includes both observed and predicted parts of the orbit. First, the predicted clock offsets are taken as constraints in the estimation process to reduce the number of the unknown parameters and improve the accuracy of the parameter estimates of the orbit. To obtain more accurate predicted clock offsets for the BDS’ orbit determination, a denoising method (also called the Tikhonov regularization algorithm), inter-satellite correlation, and the partial least squares method are all incorporated into the clock offsets prediction model. Then, the Akaike information criterion (AIC) is used to determine the arc length in the estimation models by taking the optimal arc length in the estimation of the initial orbit states into consideration. Finally, a number of experiments were conducted to evaluate the performance of the ultra-rapid orbits resulting from the proposed methods. Results showed that: (1) Compared with traditional models, the accuracy improvement of the predicted clock offsets from the proposed methods were 40.5% and 26.1% for BDS-2 and BDS-3, respectively; (2) the observed part of the orbits can be improved 9.2% and 5.0% for BDS-2 and BDS-3, respectively, by using the predicted clock offsets as constraints; (3) the accuracy of the predicted part of the orbits showed a high correlation with the AIC value, and the accuracy of the predicted orbits could be improved up to 82.2%. These results suggest that the approaches proposed in this study can significantly enhance the accuracy of the ultra-rapid orbits of BDS-2/BDS-3 satellites.

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Orbit determination and time synchronization for new-generation Beidou satellites: Preliminary results

Cited by 24 publications

References 3 publications

Carrier Phase Dual One-Way Ranging Method Based on a Frequency Hopping Signal

Carrier Phase Dual One-Way Ranging Method Based on a Frequency Hopping Signal

Pseudorange Bias Analysis and Preliminary Service Performance Evaluation of BDSBAS

A BDS-2/BDS-3 Integrated Method for Ultra-Rapid Orbit Determination with the Aid of Precise Satellite Clock Offsets

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