Integrity Performance Analysis of GPS- GLONASS with EGNOS for Applications in Complex GNSS Environments

When GNSS is used as a stand-alone navigation system in safety-critical or liability-critical applications, GNSS measurement reliability must be properly addressed. One of the main issues is the detection and the exclusion of faults in complex GNSS environments where there are high levels of code multipath that can generate biased measurements. The performance of the position calculation in terms of accuracy, robustness and reliability can be improved by applying SBAS corrections and by employing multiple GNSS constellations. This paper investigates the case of combined GPS and GLONASS constellations, and EGNOS corrections available for the GPS measurements only. A covariance simulation method is applied, and challenging road environments are specifically considered. Moreover, the paper also analyses the effect on the position solution when using a broadcast time-offset between two constellations. GPS, GLONASS and EGNOS are considered as they are presently operational systems, however the results can be generalized and applied to other future and emerging GNSS.

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