Method and Apparatus for High Precision GNSS/UWB Surveying

G.D. MacGougan, R. Klukas

Abstract:	This paper presents a method and apparatus for integrating two-way time-of-flight ultra-wideband (UWB) ranging systems with a GNSS receiver/antenna to provide a high precision surveying system. The apparatus is first introduced. The survey method is then described. It consists of three main steps. In the first step, UWB reference stations are deployed. During the second step, an initialization walk with good GNSS RTK conditions is performed to facilitate the estimation of UWB bias and scale factor states. In the last step, once the system is initialized, the survey is performed. This paper describes the estimation method used. Results from a practical example of the deployment and implementation of a combined GPS+UWB system for high precision surveying in a sub-urban neighborhood under trees and close to a house are then shown. The results show an improvement compared to GPS-only. However, due to unexpected UWB range errors which bias the fixed GPS+UWB solution, only sub-metre level accuracy is achieved instead of the desired centimetre level accuracy.
Published in:	Proceedings of the 22nd International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GNSS 2009) September 22 - 25, 2009 Savannah International Convention Center Savannah, GA
Pages:	853 - 863
Cite this article:	MacGougan, G.D., Klukas, R., "Method and Apparatus for High Precision GNSS/UWB Surveying," Proceedings of the 22nd International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GNSS 2009), Savannah, GA, September 2009, pp. 853-863.
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