Integration of pseudorange measurements from multiple base stations for asset mapping

Abstract

Abstract Differential GPS surveys can routinely yield position accuracy of better than five metres. There are a significant number of applications requiring such an accuracy level, one of which is the collection of assets such as fire hydrants, telecommunications utilities, light poles and street furniture. Processing of the double difference pseudorange observable provides an effective solution for achieving the accuracy required for asset mapping. One potential weakness of differential GPS techniques is the requirement for a continuously tracking base station. Greater survey insurance and integrity can be achieved by collecting data using multiple base sites established at different locations. This paper introduces a technique for merging the measurements acquired at roving sites and multiple base sites in a single estimation process. Double differences are generated between each rover-base station combination and are combined to yield a least squares position estimate of the rover station. Results of a...