GPS satellite clock estimation using global atomic clock network

GPS Solutions ◽  
2021 ◽  
Vol 25 (3) ◽  
Author(s):  
Jian Yao ◽  
Sungpil Yoon ◽  
Bryan Stressler ◽  
Steve Hilla ◽  
Mark Schenewerk
Keyword(s):  
Atomic Clock ◽  
Satellite Clock ◽  
Clock Network ◽  
Clock Estimation

Dark matter searches within the intercontinental optical atomic clock network

2018 ◽  
Author(s):  
P. Wcislo ◽  
P. Ablewski ◽  
K. Beloy ◽  
S. Bilicki ◽  
M. Bober ◽  
...  
Keyword(s):  
Dark Matter ◽  
Atomic Clock ◽  
Clock Network

scholarly journals A Decentralized Processing Schema for Efficient and Robust Real-time Multi-GNSS Satellite Clock Estimation

2019 ◽  
Vol 11 (21) ◽  
pp. 2595
Author(s):  
Jiang ◽  
Gu ◽  
Li ◽  
Ge ◽  
Schuh
Keyword(s):  
Real Time ◽  
High Frequency ◽  
Precise Point Positioning ◽  
High Rate ◽  
Reference Network ◽  
Satellite Clock ◽  
Navigation Data ◽  
Data Analyst ◽  
New Strategy ◽  
Clock Estimation

Real-time multi-GNSS precise point positioning (PPP) requires the support of high-rate satellite clock corrections. Due to the large number of ambiguity parameters, it is difficult to update clocks at high frequency in real-time for a large reference network. With the increasing number of satellites of multi-GNSS constellations and the number of stations, real-time high-rate clock estimation becomes a big challenge. In this contribution, we propose a decentralized clock estimation (DECE) strategy, in which both undifferenced (UD) and epoch-differenced (ED) mode are implemented but run separately in different computers, and their output clocks are combined in another process to generate a unique product. While redundant UD and/or ED processing lines can be run in offsite computers to improve the robustness, processing lines for different networks can also be included to improve the clock quality. The new strategy is realized based on the Position and Navigation Data Analyst (PANDA) software package and is experimentally validated with about 110 real-time stations for clock estimation by comparison of the estimated clocks and the PPP performance applying estimated clocks. The results of the real-time PPP experiment using 12 global stations show that with the greatly improved computational efficiency, 3.14 cm in horizontal and 5.51 cm in vertical can be achieved using the estimated DECE clock.

GNSS global real-time augmentation positioning: Real-time precise satellite clock estimation, prototype system construction and performance analysis

2018 ◽  
Vol 61 (1) ◽  
pp. 367-384 ◽  
Author(s):  
Liang Chen ◽  
Qile Zhao ◽  
Zhigang Hu ◽  
Xinyuan Jiang ◽  
Changjiang Geng ◽  
...  
Keyword(s):  
Performance Analysis ◽  
Real Time ◽  
Prototype System ◽  
System Construction ◽  
Satellite Clock ◽  
And Performance ◽  
Clock Estimation

scholarly journals Evaluation of BDS-2 and BDS-3 Satellite Atomic Clock Products and Their Effects on Positioning

2021 ◽  
Vol 13 (24) ◽  
pp. 5041
Author(s):  
Shengfeng Gu ◽  
Feiyu Mao ◽  
Xiaopeng Gong ◽  
Yidong Lou ◽  
Xueyong Xu ◽  
...  
Keyword(s):  
Atomic Clock ◽  
Satellite System ◽  
Atomic Clocks ◽  
Satellite Clock ◽  
Satellite Navigation System ◽  
Broadcast Ephemeris ◽  
Third Phase ◽  
Improved Stability ◽  
One Year ◽  
Better Than

The BeiDou Navigation Satellite System (BDS) has completed third phase construction and currently provides global services, with a mixed constellation of BDS-2 and BDS-3. The newly launched BDS-3 satellites are equipped with rubidium and passive hydrogen maser (PHM) atomic clocks. The performance of atomic clocks is one of the cores of satellite navigation system, which will affect the performance of positioning, navigation and timing (PNT). In this paper, we systematically analyze the characteristics of BDS-2 and BDS-3 atomic clocks, based on more than one year of precise satellite clock products and broadcast ephemeris. Firstly, the results of overlapping Allan variations demonstrate that BDS-3 Rb and PHM clocks improve better in stability than BDS-2 Rb clock and are comparable to GPS IIF Rb and Galileo PHM clocks. Accordingly, the STDs of BDS-3 broadcast satellite clock are better than GPS and BDS-2, which are at the same level with that of Galileo. Secondly, the inter-system bias (ISB) between BDS-2 and BDS-3 is analyzed by satellite clock datum comparison and precise point positioning (PPP). Surprisingly, the discrepancy between BDS-2 and BDS-3 satellite clock datum has a great difference between products that could reach up to about 10 ns for WHU satellite clock products and broadcast ephemeris. Moreover, the ISBs between BDS-2 and BDS-3 satellite clocks are quite stable over one-year periods. Thirdly, due to the improved stability of BDS-3 atomic clock, the 68% positioning accuracy is better than 0.65 m at 10 min for BDS-3 PPP, based on broadcast ephemeris. Besides, the non-negligible bias between BDS-2 and BDS-3 will greatly affect the BDS precise data processing. The accuracy of positioning is greatly improved when considering the ISB.

scholarly journals Efficient High-Rate Satellite Clock Estimation for PPP Ambiguity Resolution Using Carrier-Ranges

Sensors ◽  
2014 ◽  
Vol 14 (12) ◽  
pp. 22300-22312 ◽  
Author(s):  
Hua Chen ◽  
Weiping Jiang ◽  
Maorong Ge ◽  
Jens Wickert ◽  
Harald Schuh
Keyword(s):  
Ambiguity Resolution ◽  
High Rate ◽  
Satellite Clock ◽  
Clock Estimation

scholarly journals Multi-GNSS satellite clock estimation constrained with oscillator noise model in the existence of data discontinuity

2018 ◽  
Vol 93 (4) ◽  
pp. 515-528 ◽  
Author(s):  
Chuang Shi ◽  
Shiwei Guo ◽  
Shengfeng Gu ◽  
Xinhao Yang ◽  
Xiaopeng Gong ◽  
...  
Keyword(s):  
Noise Model ◽  
Satellite Clock ◽  
Oscillator Noise ◽  
Clock Estimation ◽  
Data Discontinuity

Impact of GPS differential code bias in dual- and triple-frequency positioning and satellite clock estimation

GPS Solutions ◽  
2016 ◽  
Vol 21 (3) ◽  
pp. 897-903 ◽  
Author(s):  
Haojun Li ◽  
Bofeng Li ◽  
Lizhi Lou ◽  
Ling Yang ◽  
Jiexian Wang
Keyword(s):  
Satellite Clock ◽  
Differential Code Bias ◽  
Triple Frequency ◽  
Code Bias ◽  
Clock Estimation

Satellite clock estimation at 1 Hz for realtime kinematic PPP applications

GPS Solutions ◽  
2010 ◽  
Vol 15 (4) ◽  
pp. 315-324 ◽  
Author(s):  
Xiaohong Zhang ◽  
XingXing Li ◽  
Fei Guo
Keyword(s):  
Satellite Clock ◽  
Clock Estimation ◽  
Kinematic Ppp

A flexible strategy for handling the datum and initial bias in real-time GNSS satellite clock estimation

2019 ◽  
Vol 94 (1) ◽  
Author(s):  
Lewen Zhao ◽  
Jan Dousa ◽  
Shirong Ye ◽  
Pavel Vaclavovic
Keyword(s):  
Real Time ◽  
Satellite Clock ◽  
Clock Estimation

scholarly journals Corrections of BDS Code Multipath Error in Geostationary Orbit Satellite and Their Application in Precise Data Processing

Sensors ◽  
2019 ◽  
Vol 19 (12) ◽  
pp. 2737
Author(s):  
Weiwei Song ◽  
Qiong Wu ◽  
Xiaopeng Gong ◽  
Fu Zheng ◽  
Yidong Lou
Keyword(s):  
Data Processing ◽  
Carrier Phase ◽  
Satellite System ◽  
Ionospheric Delay ◽  
Navigation Satellite ◽  
Satellite Clock ◽  
Multipath Error ◽  
Precise Data ◽  
Geo Satellites ◽  
Clock Estimation

Multipath error is a main error source in Global Navigation Satellite System (GNSS) data processing, which cannot be removed by a differential technique because of the strong relationship with the environment around the station. The multipath effect of the code observables is more complex than that of the carrier-phase observables, especially for BeiDou Navigation Satellite System (BDS) geostationary orbit (GEO) satellites. In this contribution, we deeply analyzed the characteristic and effect on the precise data processing of GEO satellite multipath errors based on a large number of permanent GNSS stations. A linear combination of code and carrier-phase observables was used to analyze the characteristics of repeatability for BDS GEO’s multipath. Then, a correction method was proposed to eliminate the multipath error of the GEO code observables, based on wavelet transform. The experiment data were collected at 83 globally distributed stations, from multi-GNSS experiments and national BDS augmentation systems, from days 32 to 66 in 2017. The results show that the systematic multipath variation component of the GEO code observables can be obtained with wavelet transform, which can significantly contribute to correcting the multipath error of GEO satellites. The average root mean square error (RMSE) of the multipath series is decreased by approximately 19.5%, 20.2%, and 7.5% for B1, B2, and B3, respectively. In addition, some experiments, including ionospheric delay extraction and satellite clock estimation, were conducted in simulated real-time mode in order to validate the effect of the correction methods. For the ionospheric delay estimation, the average RMSE of the slant ionospheric delay is reduced by approximately 15.5%. Moreover, the multipath correction can contribute greatly to shortening the convergence time of the satellite clock estimation of the BDS GEO satellites.

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