An Empirical Model for Computing GPS SPS Pseudorange Natural Biases Based on High Fidelity Measurements from a Software Receiver

S. Gunawardena, F. van Graas

Abstract:	All GNSS signals contain nominal signal distortions due to characteristics in their signal generation and transmission hardware. For most users, the ranging errors introduced by these distortions are well below their requirements for minimum levels of performance. However, for safety-of-life systems used for aircraft precision approach and landing operations, these signal deformations when interacting with dissimilar receivers can lead to pseudorange biases between ground reference stations and airborne receivers. The signal deformation monitoring (SDM) algorithms within ground reference stations of such systems must be designed such that they do not trigger on nominal signal deformation characteristic to each satellite while maintaining required detection probabilities for actual SDM faults. An essential step in this process is the development of a model that accurately characterizes nominal distortions for the current constellation of GPS satellites. This paper describes the development of such a model based on high-fidelity observations of GPS-SPS signals from a wideband software receiver.
Published in:	Proceedings of the 26th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GNSS+ 2013) September 16 - 20, 2013 Nashville Convention Center, Nashville, Tennessee Nashville, TN
Pages:	1341 - 1358
Cite this article:	Gunawardena, S., van Graas, F., "An Empirical Model for Computing GPS SPS Pseudorange Natural Biases Based on High Fidelity Measurements from a Software Receiver," Proceedings of the 26th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GNSS+ 2013), Nashville, TN, September 2013, pp. 1341-1358.
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