Analysis of GPS Pseudorange Natural Biases using a Software Receiver

Sanjeev Gunawardena and Frank van Graas

Abstract:	High integrity safety-of-life GNSS applications such as civil aviation use a differential architecture to remove common mode system errors to achieve centimeter-level relative positioning accuracy. Errors not removed by differential GNSS include multipath, thermal noise, tropospheric and ionospheric residuals, and a type of error known as pseudorange natural biases that are caused by nominal satellite signal deformations interacting with dissimilar reference station versus user receivers. This paper reports on an analysis of pseudorange natural biases that was performed using Ohio University’s Transform-Domain Instrumentation GNSS Receiver (TRIGR) platform. Software receiver processing was used to estimate C/A code natural biases for the GPS constellation of January/February 2012 as a function of receiver correlator spacing and two representative antenna/front-end transfer functions. The impact of satellite elevation angle on observed natural biases is also reported for a few select satellites.
Published in:	Proceedings of the 25th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GNSS 2012) September 17 - 21, 2012 Nashville Convention Center, Nashville, Tennessee Nashville, TN
Pages:	2141 - 2149
Cite this article:	Gunawardena, Sanjeev, van Graas, Frank, "Analysis of GPS Pseudorange Natural Biases using a Software Receiver," Proceedings of the 25th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GNSS 2012), Nashville, TN, September 2012, pp. 2141-2149.
Full Paper:	ION Members/Non-Members: 1 Download Credit Sign In