The Effect of Nominal Signal Deformation Biases on ARAIM Users

R.E. Phelts, J. Blanch, T. Walter, P. Enge

Abstract:	Predictions of the future performance of ARAIM users depend on a thorough understanding of the nominal performance of the satellites from all constellations. This generally requires long-term, careful monitoring and analysis of all the signals of interest in order to determine future real-world performance expectations. To date, relatively little work has gone into analyzing the effects that nominal range biases, such as signal deformations could have on ARAIM performance. In this paper, nominal signal deformation measurements, analysis techniques, and results previously used for GPS and SBAS (Space-Based Augmentation Systems) are extended to ARAIM. Measured data previously used to characterize the GPS nominal biases on L1 C/A code is used to estimate the effects of potential nominal range biases on several future satellite navigation ranging signals including GPS L5, Galileo E1 and E5a, and GLONASS L1 and L2. The possible user receiver implementations for each respective signal are modeled to find the range of biases for typical users. Stanford University’s Matlab Accuracy and Availability Simulation Tool (MAAST) is then used to predict ARAIM user vertical protection levels (VPLs) given these biases. It is found that traditional approach for applying the worst-case pseudorange bias to all signals may be inadequate to assure integrity. The biases may vary significantly depend on the codes and frequencies considered, and they are constellation-specific. Ultimately, acceptable ARAIM performance may rely on practical user receiver design constraints and more sophisticated integrity analyses to minimize the effects of pseudorange biases on the VPL.
Published in:	Proceedings of the 2014 International Technical Meeting of The Institute of Navigation January 27 - 29, 2014 Catamaran Resort Hotel San Diego, California
Pages:	56 - 67
Cite this article:	Phelts, R.E., Blanch, J., Walter, T., Enge, P., "The Effect of Nominal Signal Deformation Biases on ARAIM Users," Proceedings of the 2014 International Technical Meeting of The Institute of Navigation, San Diego, California, January 2014, pp. 56-67.
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