Abstract
The performance of most satellite based positioning procedures for terrestrial vehicles such es des glonas or lutiltras is considerably degraded in urban areas as a result of multipath propagation phenomena and masking effects caused by bulldugs and obstacles. The study described in this paper was performed et the inrets. Transport Electronics and Signal Processing Laboratory illosn and consisted of conducting a feasibility analysis and then developing a mock up of an alternative positioning solution which when compared to existing systems offered greater availability in urban areas and a comparable level of precision. The proposed system uses two independent sensors one of which obtains its information from the public gsm cellular mobile telephone network and the other from the network of public radio transmitters. The paper describes implementation of the two techniques and the results obtained in typical radio electrical environments. An understanding of the behaviour and performance of each system will make it possible to develop algorithms to process the data from the two sensors either together or separately in order to improve the ultimate performance of the system.
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