Modeling and assessment of combined GPS/GLONASS precise point positioning

A combination of GPS and GLONASS observations can offer improved reliability, availability and accuracy for precise point positioning (PPP). We present and analyze a combined GPS/GLONASS PPP model, including both functional and stochastic components. Numerical comparison and analysis are conducted with respect to PPP based on only GPS or GLONASS observations to demonstrate the benefits of the combined GPS/GLONASS PPP. The observation residuals are analyzed for more appropriate stochastic modeling for observations from different navigation systems. An analysis is also made using different precise orbit and clock products. The performance of the combined GPS/GLONASS PPP is assessed using both static and kinematic data. The results indicate that the convergence time can be significantly reduced with the addition of GLONASS data. The positioning accuracy, however, is not significantly improved by adding GLONASS data if there is a sufficient number of GPS satellites with good geometry.

[1]  M. Pratt,et al.  Single-Epoch Integer Ambiguity Resolution with GPS-GLONASS L1 Data , 1997 .

[2]  Liwen Dai,et al.  Integrated StarFire GPS with GLONASS for Real-Time Precise Navigation and Positioning , 2011 .

[3]  A. Niell.  Global mapping functions for the atmosphere delay at radio wavelengths , 1996 .

[4]  Robert Weber,et al.  Precise GLONASS orbit determination within the IGS/IGLOS – Pilot Project , 2004 .

[5]  K. de Jong,et al.  G2 - The First Real-Time GPS and GLONASS Precise Orbit and Clock Service , 2009 .

[6]  Richard A. Brown,et al.  Introduction to random signals and applied kalman filtering (3rd ed , 2012 .

[7]  Lambert Wanninger,et al.  Combined Processing of GPS, GLONASS, and SBAS Code Phase and Carrier Phase Measurements , 2007 .

[8]  Hideo Kumagai,et al.  GPS Navigation Algorithms and Estimation : Detection Theory , 2002 .

[9]  Alan Dodson,et al.  Wet tropospheric effects on precise relative GPS height determination , 1996 .

[10]  Christian Rocken,et al.  A New Real-Time Global GPS and GLONASS Precise Positioning Correction Service: Apex , 2011 .

[11]  A. Hesselbarth,et al.  Short-term Stability of GNSS Satellite Clocks and its Effects on Precise Point Positioning , 2008 .

[12]  Yang Gao,et al.  Performance Analysis of Precise Point Positioning Based on Combined GPS and GLONASS , 2007 .

[13]  Dmitry Kozlov,et al.  Statistical Characterization of Hardware Biases in GPS+GLONASS Receivers , 2000 .

[14]  Pascale Defraigne,et al.  Combining GPS and GLONASS for time and frequency transfer , 2011 .

[15]  I. Shapiro,et al.  Geodesy by radio interferometry: Effects of atmospheric modeling errors on estimates of baseline length , 1985 .

[16]  M. Meindl,et al.  GNSS processing at CODE: status report , 2009 .

[17]  Oliver Montenbruck,et al.  Performance Evaluation of Integrated GPS/GIOVE Precise Point Positioning , 2010 .

[18]  Yang Gao,et al.  Estimation of GPS-GLONASS System Time Difference with Application to PPP , 2008 .

[19]  Lambert Wanninger,et al.  Carrier-phase inter-frequency biases of GLONASS receivers , 2012, Journal of Geodesy.

[20]  V. V. Mitrikas,et al.  High-accurate GLONASS Orbit and Clock Determination for the Assessment of System Performance , 2006 .

[21]  R. Piriz,et al.  Orbits and Clocks for GLONASS Precise-Point-Positioning , 2009 .