Optimisation of a GPS based AVL System Data using a Limited Bandwidth Trunked Radio Data Link for a 600 Vehicle Fleet

Grant Wensor and Rodney A. Walker

Abstract:	The desire to know where assets are at any time is an essential part of any efficient fleet management system. This paper describes the optimisation techniques chosen in the development of a real time tracking system for a fleet of 600 buses. It also describes optimisation techniques used to minimise the data throughput on the low bandwidth trunked radio network to allow the differential information to be incorporated into the bus position solution. The system employs the use of a half duplex trunked radio data link (MPT1327) with very limited bandwidth, and was developed for the Brisbane City Council (BCC) - arguably the second largest civic council in the world. The improvements in throughput on a low bandwidth radio link by data optimisation and compression are illustrated. The paper also shows how the GPS system plays an important role in the overall strategy to improve customer service by exploiting both wired and wireless data communications systems. Some of the technical and political hurdles crossed in the effort to facilitate wireless information transfer are also described.
Published in:	Proceedings of the 1997 National Technical Meeting of The Institute of Navigation January 14 - 16, 1997 Loews Santa Monica Hotel Santa Monica, CA
Pages:	755 - 760
Cite this article:	Wensor, Grant, Walker, Rodney A., "Optimisation of a GPS based AVL System Data using a Limited Bandwidth Trunked Radio Data Link for a 600 Vehicle Fleet," Proceedings of the 1997 National Technical Meeting of The Institute of Navigation, Santa Monica, CA, January 1997, pp. 755-760.
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