Performance Analysis of Atmospheric Constrained Uncombined Multi-GNSS PPP

The general objective of this study is to analyze the performance of Precise Point Positioning (PPP) convergence and initialization while stochastically constraining the atmosphere. One specific objective of this study is to review the performance of dualand triple-frequency PPP solutions using uncombined measurements. The research question to be answered is whether there is any significant benefit in constraining the atmosphere, specifically the ionospheric parameter, in dualand triple-frequency PPP processing? For thorough performance analysis in the uncombined PPP case, data from 70 globally distributed multi-GNSS stations were processed for the month of February, 2016. The uncombined triple-frequency PPP results with GIM ionospheric constraints showed reduced convergence time compared to unconstrained solutions. At the 68 percentile, a 60% and 78% reduction in convergence was observed for dualand triple-frequency PPP with ionospheric constraints, respectively. However, more than 50% improvement was observed for constrained triple-frequency uncombined GNSS PPP solution convergence and initialization in the first 5 minutes as compared to dual-frequency PPP solutions. It was concluded that by applying atmospheric constraints in an uncombined multi-GNSS approach, significant improvements were observed for both dualand triple-frequency PPP implementations.

[1]  Baocheng Zhang,et al.  Multi-GNSS precise point positioning (MGPPP) using raw observations , 2017, Journal of Geodesy.

[2]  J. Zumberge,et al.  Precise point positioning for the efficient and robust analysis of GPS data from large networks , 1997 .

[3]  Baocheng Zhang,et al.  PPP-RTK: Results of CORS Network-Based PPP with Integer Ambiguity Resolution , 2010 .

[4]  Yidong Lou,et al.  An improved approach to model ionospheric delays for single-frequency Precise Point Positioning , 2012 .

[5]  Ling Huang,et al.  On the Convergence of Ionospheric Constrained Precise Point Positioning (IC-PPP) Based on Undifferential Uncombined Raw GNSS Observations , 2013, Sensors.

[6]  Christoph Günther,et al.  Reliable Integer Ambiguity Resolution with Multi-Frequency Code Carrier Linear Combinations , 2010 .

[7]  Shau-Shiun Jan.  Vertical Guidance Performance Analysis of the L1–L5 Dual-Frequency GPS/WAAS User Avionics Sensor , 2010, Sensors.

[8]  Paul Collins,et al.  Global and Regional Ionospheric Corrections for Faster PPP Convergence , 2014 .

[9]  Baocheng Zhang,et al.  On the estimability of parameters in undifferenced, uncombined GNSS network and PPP-RTK user models by means of $$\mathcal {S}$$S-system theory , 2016 .

[10]  Y. Bock,et al.  Triple-frequency GPS precise point positioning with rapid ambiguity resolution , 2013, Journal of Geodesy.

[11]  Paul Collins,et al.  Products and Applications for Precise Point Positioning - Moving Towards Real-Time , 2004 .

[12]  D. Laurichesse,et al.  Fast PPP Convergence Using Multi-constellation and Triple-frequency Ambiguity Resolution , 2016 .

[13]  Paul Collins,et al.  External Ionospheric Constraints for Improved PPP-AR Initialisation and a Generalised Local Augmentation Concept , 2012 .

[14]  Charles Wang,et al.  Multi-GNSS precise point positioning with raw single-frequency and dual-frequency measurement models , 2016, GPS Solutions.

[15]  Bei Jinzhong,et al.  Performance of Precise Point Positioning (PPP) Based on Uncombined Dual-Frequency GPS Observables , 2011 .

[16]  Baocheng Zhang,et al.  A Novel Un-differenced PPP-RTK Concept , 2011, Journal of Navigation.

[17]  Haibo He,et al.  GNSS multi-carrier fast partial ambiguity resolution strategy tested with real BDS/GPS dual- and triple-frequency observations , 2013, GPS Solutions.

[18]  Jingnan Liu,et al.  Triple-frequency carrier ambiguity resolution for Beidou navigation satellite system , 2014, GPS Solutions.

[19]  Sunil Bisnath,et al.  Challenges in Assessing PPP Performance , 2014 .

[20]  Richard B. Langley,et al.  Analyzing GNSS data in precise point positioning software , 2011 .

[21]  Mohamed Elsobeiey,et al.  Precise Point Positioning using Triple-Frequency GPS Measurements , 2015 .

[22]  Sunil Bisnath,et al.  Reduction of PPP convergence period through pseudorange multipath and noise mitigation , 2015, GPS Solutions.