Performance Analysis of Sensor-Aided GNSS Signal Acquisition in Signal Degraded Environments

Damien Kubrak, Michel Monnerat, Geraldine Artaud and Lionel Ries

Abstract:	The acquisition of GNSS signals may become very critical in urban environments as the signals to process are very weak. Increasing the integration time is then the only solution to improve the receiver sensitivity. However it in turn renders the acquisition process very sensitive to the motion experienced by the receiver’s antenna. In order to limit the energy loss, this paper investigates the use of low-cost sensors to keep track of the antenna motion. The paper draws a detailed map of all error sources that may occur during the correlation process. It clearly shows that the user’s motion is the biggest problem to face. Simulations of the user’s Doppler estimation using inertial sensors of different grades are then conducted, together with an analysis of the impact of initial errors. Simulations show that the INS-derived user’s Doppler estimation can be available for 1.2 seconds while keeping the correlation losses below 1 dB. It is also shown that the inclination angles have a direct impact on the overall accuracy of the Doppler estimate.
Published in:	Proceedings of the 2008 National Technical Meeting of The Institute of Navigation January 28 - 30, 2008 The Catamaran Resort Hotel San Diego, CA
Pages:	862 - 870
Cite this article:	Kubrak, Damien, Monnerat, Michel, Artaud, Geraldine, Ries, Lionel, "Performance Analysis of Sensor-Aided GNSS Signal Acquisition in Signal Degraded Environments," Proceedings of the 2008 National Technical Meeting of The Institute of Navigation, San Diego, CA, January 2008, pp. 862-870.
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