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This paper presents an analysis of Global Positioning System (GPS) availability from the perspective of dilution of precision (DOP) and number of satellites in view. GPS data used in the analysis were taken from a 13,000 km U.S. test vehicle drive comprising a real world driving profile of freeways, rural, urban, and residential roads. Metrics examined are: DOP outage period duration, distribution of DOP values, and the distribution of the number of satellites available for positioning.

Optical based sensor systems for vehicle based detection and warning systems are under development to reduce accidents and limit injuries caused by accidents. (1, 2, 3) In order to validate these types of detection systems, it is necessary to perform real world tests. In the case of pedestrian detection systems, this is very difficult in the field for safety reasons. Instead, simulated tests are more desirable. This paper describes work to understand the effectiveness of using virtual pedestrians as surrogates for real world pedestrian detection.