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

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.

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Regional BDS satellite clock estimation with triple-frequency ambiguity resolution based on undifferenced observation

GPS Solutions ◽

10.1007/s10291-019-0828-0 ◽

2019 ◽

Vol 23 (2) ◽

Cited By ~ 6

Author(s):

Xinhao Yang ◽

Shengfeng Gu ◽

Xiaopeng Gong ◽

Weiwei Song ◽

Yidong Lou ◽

...

Keyword(s):

Ambiguity Resolution ◽

Satellite Clock ◽

Triple Frequency ◽

Clock Estimation

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GPS satellite clock estimation using global atomic clock network

GPS Solutions ◽

10.1007/s10291-021-01145-8 ◽

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

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

Advances in Space Research ◽

10.1016/j.asr.2017.08.037 ◽

2018 ◽

Vol 61 (1) ◽

pp. 367-384 ◽

Cited By ~ 7

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

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BDS Precise Point Positioning for Seismic Displacements Monitoring: Benefit from the High-Rate Satellite Clock Corrections

Sensors ◽

10.3390/s16122192 ◽

2016 ◽

Vol 16 (12) ◽

pp. 2192 ◽

Cited By ~ 7

Author(s):

Tao Geng ◽

Xing Su ◽

Rongxin Fang ◽

Xin Xie ◽

Qile Zhao ◽

...

Keyword(s):

Precise Point Positioning ◽

High Rate ◽

Satellite Clock ◽

Point Positioning ◽

Seismic Displacements

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Ambiguity Resolution In Precise Point Positioning Technique: A Case Study

Journal of Applied Engineering Sciences ◽

10.1515/jaes-2015-0007 ◽

2015 ◽

Vol 5 (1) ◽

pp. 53-60 ◽

Cited By ~ 3

Author(s):

S. Nistor ◽

A. S. Buda

Keyword(s):

Ambiguity Resolution ◽

Carrier Phase ◽

Precise Point Positioning ◽

Main Idea ◽

Convergence Time ◽

Powerful Method ◽

Satellite Clock ◽

Positioning Technique ◽

Point Positioning

Abstract Because of the dynamics of the GPS technique used in different domains like geodesy, near real-time GPS meteorology, geodynamics, the precise point positioning (PPP) becomes more than a powerful method for determining the position, or the delay caused by the atmosphere. The main idea of this method is that we need only one receiver – preferably that have dual frequencies pseudorange and carrier-phase capabilities – to obtain the position. Because we are using only one receiver the majority of the residuals that are eliminated in double differencing method, we have to estimate them in PPP. The development of the PPP method allows us, to use precise satellite clock estimates, and precise orbits, resulting in a much more efficient way to deal with the disadvantages of this technique, like slow convergence time, or ambiguity resolution. Because this two problem are correlated, to achieve fast convergence we need to resolve the problem of ambiguity resolution. But the accuracy of the PPP results are directly influenced by presence of the uncalibrated phase delays (UPD) originating in the receivers and satellites. In this article we present the GPS errors and biases, the zenith wet delay and the necessary time for obtaining the convergence. The necessary correction are downloaded by using the IGS service.

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PPP with integer ambiguity resolution for GPS and Galileo using satellite products from different analysis centers

GPS Solutions ◽

10.1007/s10291-021-01140-z ◽

2021 ◽

Vol 25 (3) ◽

Author(s):

Marcus Glaner ◽

Robert Weber

Keyword(s):

Ambiguity Resolution ◽

Observation Interval ◽

Theoretical Background ◽

Integer Ambiguity Resolution ◽

High Rate ◽

Integer Ambiguity ◽

Convergence Time ◽

Integer Number ◽

International Gnss Service ◽

Satellite Product

AbstractInteger ambiguity resolution is the key for achieving the highest accuracy with Precise Point Positioning (PPP) and for significantly reducing the convergence time. Unfortunately, due to hardware phase biases originating from the satellites and receiver, fixing the phase ambiguities to their correct integer number is difficult in PPP. Nowadays, various institutions and analysis centers of the International GNSS Service (IGS) provide satellite products (orbits, clocks, biases) based on different strategies, which allow PPP with integer ambiguity resolution (PPP-AR) for GPS and Galileo. We present the theoretical background and practical application of the satellite products from CNES, CODE, SGG, and TUG. They are tested in combined GPS and Galileo PPP-AR solutions calculated using our in-house software raPPPid. The numerical results show that the choice of satellite product has an influence on the convergence time of the fixed solution. The satellite product of CODE performs better than the following, in the given order: SGGCODE, SGGGFZ, TUG, CNES, and SGGCNES. After the convergence period, a similar level of accuracy is achieved with all these products. With these satellite products and observations with an interval of 30 s, a mean convergence time of about 6 min to centimeter-level 2D positioning is achieved. Using high-rate observations and an observation interval of 1 s, this period can be reduced to a few minutes and, in the best case, just one minute.

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