Cooperative Detection of Multiple GNSS Satellite Signals in GNSS-Challenged Environments

Maherizo Andrianarison, Mohamed Sahmoudi, Rene Landry

Abstract:	Conventional GNSS receivers process different satellite signals individually, since each signal is treated independently at the acquisition level. Satellite detection depends only on its own signal power and user’s dynamics. However, in harsh environment, a better approach is to process all signals in view collectively to take advantage of the spatial correlation between satellite signals. Collective Detection (CD) approach is a very interesting technique because of its better performance to detect weak signals in challenged environments, in which the code phase search for all visible satellites is mapped into a receiver position-clock bias grid and the satellite signals are not acquired individually but collectively. This concept depends heavily on assistance information, which is given to the user in order to define a position and clock bias uncertainty range. All studies about CD are based on the use of a fixed reference station that provides sets of data assistance to the mobile station receiver so that it can estimate roughly its position. Thus, the practical implementation of the CD is still related in a challenge of applications including the need of a second static receiver. To relax the need of such material, two new algorithms are presented in this paper: 1) cooperative positioning with a mobile reference station and 2) availability of data from a well-known reference station. The first way shows that we are not limited with a static reference station and allows a mobile receiver in challenging reception condition to get help from another mobile station or other cooperative user in a good reception situation. The second way consists in calculating the user mobile position based on reference points that exist somewhere as a network reference point with a known position (from a regional or global network like IGS - International GNSS Service).
Published in:	Proceedings of the 28th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GNSS+ 2015) September 14 - 18, 2015 Tampa Convention Center Tampa, Florida
Pages:	370 - 380
Cite this article:	Andrianarison, Maherizo, Sahmoudi, Mohamed, Landry, Rene, "Cooperative Detection of Multiple GNSS Satellite Signals in GNSS-Challenged Environments," Proceedings of the 28th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GNSS+ 2015), Tampa, Florida, September 2015, pp. 370-380.
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