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

Sensors ◽  
2016 ◽  
Vol 16 (12) ◽  
pp. 2192 ◽  
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

Multipath extraction and mitigation for high-rate multi-GNSS precise point positioning

2019 ◽  
Vol 93 (10) ◽  
pp. 2037-2051 ◽  
Author(s):  
Kai Zheng ◽  
Xiaohong Zhang ◽  
Pan Li ◽  
Xingxing Li ◽  
Maorong Ge ◽  
...  
Keyword(s):  
Precise Point Positioning ◽  
High Rate ◽  
Point Positioning

scholarly journals Performance of Open Source Precise Point Positioning Software Using Single-Frequency GPS Data

2006 ◽  
Vol 41 (2) ◽  
pp. 79-86 ◽  
Author(s):  
Chalermchon Satirapod ◽  
Somchai Kriengkraiwasin
Keyword(s):  
Open Source ◽  
Precise Point Positioning ◽  
Main Tool ◽  
Single Frequency ◽  
Gps Data ◽  
Differential Gps ◽  
Satellite Clock ◽  
Positioning Accuracy ◽  
Point Positioning ◽  
Station Location

Performance of Open Source Precise Point Positioning Software Using Single-Frequency GPS Data This research aims to assess the performance of GPS Precise Point Positioning (PPP) with code and carrier phase observations from L1 signal collected from geodetic GPS receiver around the world. A simple PPP software developed for processing the single frequency GPS data is used as a main tool to assess a positioning accuracy. The precise orbit and precise satellite clock corrections were introduced into the software to reduce the orbit and satellite clock errors, while ionosphere-free code and phase observations were constructed to mitigate the ionospheric delay. The remaining errors (i.e. receiver clock error, ambiguity term) are estimated using Extended Kalman Filter technique. The data retrieved from 5 IGS stations located in different countries were used in this study. In addition, three different periods of data were downloaded for each station. The obtained data were then cut into 5-min, 10-min, 15-min and 30-min data segments, and each data segment was individually processed with the developed PPP software to produce final coordinates. Results indicate that the use of 5-min data span can provide a horizontal positioning accuracy at the same level as a pseudorange-based differential GPS technique. Furthermore, results confirm effects of station location and seasonal variation on obtainable accuracies.

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.

SBAS orbit and satellite clock corrections for precise point positioning

GPS Solutions ◽  
2012 ◽  
Vol 17 (4) ◽  
pp. 465-473 ◽  
Author(s):  
Anja Heßelbarth ◽  
Lambert Wanninger
Keyword(s):  
Precise Point Positioning ◽  
Satellite Clock ◽  
Point Positioning

scholarly journals Ambiguity Resolution In Precise Point Positioning Technique: A Case Study

2015 ◽  
Vol 5 (1) ◽  
pp. 53-60 ◽  
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.

scholarly journals Impact of sampling rate of IGS satellite clock on precise point positioning

2010 ◽  
Vol 13 (2) ◽  
pp. 150-156 ◽  
Author(s):  
Fei Guo ◽  
Xiaohong Zhang ◽  
Xingxing Li ◽  
Shixiang Cai
Keyword(s):  
Precise Point Positioning ◽  
Sampling Rate ◽  
Satellite Clock ◽  
Point Positioning
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