Performance of BDS-3: Measurement Quality Analysis, Precise Orbit and Clock Determination

Xie, Xin; Geng, Tao; Zhao, Qile; Liu, Jingnan; Wang, Bin

doi:10.3390/s17061233

Cited by 63 publications

(29 citation statements)

References 24 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Tan et al showed the initial results of the precise orbit determination with nine stations [10]. Xie et al evaluated the multipath effect and the performance of the precise orbit and clock determination [11]. Zhao, et al proved that the best orbit determination solution for BeiDou-3e is obtained with five-parameter Extended CODE Orbit Model (ECOM) and a three-day arc [12].…”

Section: Introductionmentioning

confidence: 99%

Characteristics of BeiDou-3 Experimental Satellite Clocks

Geng

Zhao

et al. 2018

Remote Sensing

Self Cite

View full text Add to dashboard Cite

The characteristics of the improved Atomic Frequency Standard (AFS) operated on the latest BeiDou-3 experimental satellites are analyzed from day-of-year (DOY) 254 to 281, of the year 2017, considering the following three aspects: stability, periodicity, and prediction precision. The two-step method of Precise Orbit Determination (POD) is used to obtain the precise clock offsets. We presented the stability of such new clocks and studied the influence of the uneven distribution of the ground stations on the stability performance of the clock. The results show that the orbit influence on the Medium Earth Orbit (MEO) clock offsets is the largest of three satellite types, especially from 3 × 10 3 s to 8.64 × 10 4 s. Considering this orbit influence, the analysis shows that the Passive Hydrogen Maser (PHM) clock carried on C32 is approximately 2.6 × 10 − 14 at an interval of 10 4 , and has the best stability for any averaging intervals among the BeiDou satellite clocks, which currently achieves a level comparable to that of the PHM clock of Galileo, and the rubidium (Rb) clocks of Global Positioning System (GPS) Block IIF. The stability of the improved Rb AFS on BeiDou-3 is also superior to that of BeiDou-2 from 3 × 10 2 s to 3 × 10 3 s, and comparable to that of Rb AFS on the Galileo. Moreover, the periodicity of the PHM clock and the improved Rb clock are presented. For the PHM clock, the amplitudes are obviously reduced, while the new Rb clocks did not show a visible improvement, which will need further analysis in the future. As expected, the precision of the short-term clock prediction is improved because of the better characteristics of AFS. The Root Mean Square (RMS) of 1-h clock prediction is less than 0.16 ns.

show abstract

Section: Introductionmentioning

confidence: 99%

Characteristics of BeiDou-3 Experimental Satellite Clocks

Geng

Zhao

et al. 2018

Remote Sensing

Self Cite

View full text Add to dashboard Cite

show abstract

“…System) are widely used for navigation, positioning, scientific [1][2][3][4], and engineering applications [5][6][7]. That includes deformations [8][9][10] and structure monitoring [11][12][13], GIS (Geographic Information System) applications [14][15][16], land use [16][17][18][19], and cadastre [20][21][22][23][24].…”

Section: Gnss (Global Navigationmentioning

confidence: 99%

High-Rate Monitoring of Satellite Clocks Using Two Methods of Averaging Time

Maciuk

Lewińska

2019

Remote Sensing

View full text Add to dashboard Cite

Knowledge of the global navigation satellite system (GNSS) satellite clock error is crucial in real-time precise point positioning (PPP), seismology, and many other high-rate GNSS applications. In this work, the authors show the characterisation of the atomic GNSS clock’s stability and its dependency on the adopted orbit type using Allan deviation with two methods of averaging time. Four International GNSS Service (IGS) orbit types were used: broadcast, ultra-rapid, rapid and final orbit. The calculations were made using high-rate 1 Hz observations from the IGS stations equipped with external clocks (oscillators). The most stable receiver oscillator was chosen as a reference clock. The results show the advantage of the newest GPS satellite block with respect to the other satellites. Significant differences in the results based on the orbit type used have not been recorded. Many averaging time methods used in Allan deviation (ADEV) show the clock’s fluctuations, usually smoothed in 2n s averaging times.

show abstract

“…The BDS-3 starts its development with a five experimental satellites demonstration system since 2015, including two IGSO satellites, I1-S (C31) and I2-S (C32), and three MEO satellites, M1-S (C33), M2-S (C34) and M3-S (C35) (Xie et al 2017;Yang et al 2018). The goal of this demonstration system is to comprehensively test and analyze its new features, e.g., the new types of the navigation signals, the inter-satellite links (ISL), and the uploading injection and downloading reception signal, etc.…”

Section: Introductionmentioning

confidence: 99%

“…Though the number of stations is rather limited, Tan et al (2016) presented the first attempt of precise orbit determination (POD) for the experimental satellites with the old B1, B2 and B3 signals. Xie et al (2017) presents the POD results with the new navigation signals, and the orbit overlap and the satellite laser ranging (SLR) evaluation both suggested that the POD precision is about 2-6 dm in 3D and 1-2 dm in the radial component. As a great advantage of the new generation BDS, the contribution of the ISL in terms of POD was analyzed and confirmed by Ren et al (2017) with different data processing strategies.…”

Section: Introductionmentioning

confidence: 99%

BDS-3 differential code bias estimation with undifferenced uncombined model based on triple-frequency observation

Wang

Zhao

et al. 2020

J Geod

Self Cite

View full text Add to dashboard Cite

Since 2015, the new generation global BDS system, i.e., BDS-3, has started its development with five experimental satellites demonstration system and has announced its initial global service officially on December 27, 2018. Among the various characteristics to be analyzed for the new generation BDS satellites, the differential code bias (DCB) is of special attention since that it has a direct dependence on the new signals, i.e., B1C and B2a, and it is one of the most intricacy problems in the ionosphere sensing and positioning with multi-GNSS and multi-frequency observations. To take the full capability of the triplefrequency BDS signals, this paper proposed a new method for the DCB estimation in which the undifferenced uncombined observations are processed in PPP mode. In addition, with the intention to estimate all the unknowns, including the DCB, in a single filter, the DESIGN (deterministic plus stochastic ionosphere model for GNSS) method is applied for the ionospheric delay constrains in this method. In the formula derivation, special attention is given to the DCB and clock parameters due to different frequencies for B1I/B1C, etc. Then, the efficiency of the new method is assessed with observations of 23 iGMAS stations capable for BDS triple-frequency tracking and 21 IGS stations capable for GPS triple-frequency tracking during DOY 001 to 090, 2019. Moreover, the traditional DCB estimation method by employing the geometry-free (GF) combination with the ionospheric delay removed by global ionosphere map product is also performed for comparison purpose. The experimental results suggest that by using the undifferenced uncombined solution, rather than the GF combination, the BDS-2 DCB on B1IB2I and B1CB3I can be improved, especially for the MEO satellites. Regarding to the DLR products, the undifferenced uncombined DCB solution presents a RMS of 0.32 ns and 0.27 ns for B1IB2I and B1CB3I, respectively. Concerning the BDS-3 satellites DCB, it is GF combination that performs better by a factor of 12.7% and 15.2% for B1CB2a and B1CB3I, respectively. This is mainly due to the fact that the undifferenced uncombined DCB solution is sensitive to the limited precision of the BDS-3 orbit and clock. This conclusion is further confirmed by the improvement in the GPS DCB solution with the new method. Compared with the GF combination solution, the STD for daily repeatability improves from 0.088 to 0.061 ns and 0.119 to 0.090 ns for satellite on C1WC2W and C1WC5X, respectively, by using the undifferenced uncombined model.

show abstract

Performance of BDS-3: Measurement Quality Analysis, Precise Orbit and Clock Determination

Cited by 63 publications

References 24 publications

Characteristics of BeiDou-3 Experimental Satellite Clocks

Characteristics of BeiDou-3 Experimental Satellite Clocks

High-Rate Monitoring of Satellite Clocks Using Two Methods of Averaging Time

BDS-3 differential code bias estimation with undifferenced uncombined model based on triple-frequency observation

Contact Info

Product

Resources

About