Land-Mobile GPS Receiver

Harumasa Hojo, Shigeo Kawashima and Mikio Nakamura

Abstract:	A mobile plays a very important role as a transportation method and it is very valuable to know his location because optimal fleet management is possible in a taxi or in a trucking company to improve customer service and to increase operating efficiency. A GPS receiver is used for a land-mobile location system because precise position, speed and time are available continuously in world wide under any weather condition. But, GPS system has a disadvantage that position fix is unavailable due to GPS signal masking in tunnels or in areas crowded with buildings. On the other hand, dead reckoning system has an advantage that position fix is available in tunnels or in building areas and high position accuracy can be obtained for a short period. Therefore, by combining GPS and dead reckoning, the advantages of both systems are available. But, there is no report using a rate gyro which is unaffcted by iron materials, compared with a magnet compass. This paper describes the system combining a GPS receiver with dead reckoning system of a vibratory rate gyro and a distance sensor. Through running tests on roads, this combined system has the performance enough as a landmobile location system. That is, GPS+DR gives positions at any time without deterioration of position accuracy compared with stand alone GPS. A rate gyro is unaffected by iron materials compared with a magnet compass.
Published in:	Proceedings of the 3rd International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GPS 1990) September 19 - 21, 1990 The Broadmoor Hotel Colorado Spring, CO
Pages:	183 - 190
Cite this article:	Hojo, Harumasa, Kawashima, Shigeo, Nakamura, Mikio, "Land-Mobile GPS Receiver," Proceedings of the 3rd International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GPS 1990), Colorado Spring, CO, September 1990, pp. 183-190.
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