High Precision GPS Deformation Monitoring using Single Receiver Carrier Phase Data
The use of GPS in single receiver mode may offer significant potential for deformation monitoring. Single receiver positioning eliminates the need for base stations located on nearby stable points. Single receiver positioning offers logistical, technical and economic advantages and may be the only viable option in some monitoring applications. Not only may single receiver positioning be applicable for the detection of structural deformation, it may also provide a means of monitoring the long and short-term stability of Continuously Operating Reference Stations (CORS). There is a proliferation of CORS networks around the world, but users need to be assured that these stations are stable if they are to be used with confidence for high precision applications.
In conventional differential carrier phase based GPS positioning, advantage is taken of the fact that many of the error sources are spatially correlated. The formation of between-receiver and between satellite differences helps to eliminate or at least reduce the impact of these errors. However, many of these errors also exhibit a strong temporal correlation that can likewise be exploited to minimise their impact. This paper presents results of temporal correlation analysis conducted on various sources of errors that affect single receiver positioning after a discussion of different types of GPS errors. These results will form the basis of a new GPS processing strategy that uses the temporal correlation between GPS errors to achieve high accuracy GPS positioning using a single receiver.
KeywordsPrecise Point Positioning (PPP) Deformation Monitoring
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