Bridge Deflection Monitoring and Frequency Identification with Single Frequency GPS Receivers

Emily Cosser

Abstract:	Single frequency GPS receivers are typically around half the price of dual frequency receivers, but they have the disadvantage of long ambiguity resolution times due to no wide lane being available. In the context of bridge monitoring the ambiguity search can be accelerated as the receivers do not move very far from a ‘known’ coordinate. This paper details the two methods to speed up ambiguity resolution for single frequency receivers on small and larger bridges. Results from trials conducted on the Wilford Bridge in Nottingham and the Humber Bridge near Hull in the UK are presented. Coordinates from dual and single frequency GPS data are compared showing that comparable results can be achieved with single frequency receivers. Identification of the natural frequency of bridge movement is an important tool in bridge health monitoring. The frequencies identified from GPS and accelerometer data are compared and even though the GPS data is noisier the same frequencies are detected.
Published in:	Proceedings of the 17th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GNSS 2004) September 21 - 24, 2004 Long Beach Convention Center Long Beach, CA
Pages:	235 - 240
Cite this article:	Cosser, Emily, "Bridge Deflection Monitoring and Frequency Identification with Single Frequency GPS Receivers," Proceedings of the 17th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GNSS 2004), Long Beach, CA, September 2004, pp. 235-240.
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