Development and Test Results of a Cost Effective Inverse DGPS System

J.K. Ray and K. V. Kalligudd

Abstract:	An Inverse Differential GPS (IDGPS) system is developed to achieve better GPS accuracy and significant cost savings on the air radio traffic charges by not broadcasting direct RTCM messages to the vehicles. The system consists of a Reference Station and up to twohundred and fifty In-Vehicle Equipment (IVE) fitted in cars. Each IVE has a low cost GPS receiver and a communication link to send data to a Control Station, which also receives RTCM data from the Reference Station through a leased line. The IDGPS is implemented in the measurement domain. The accuracy of the IVE position is calculated before and after the range correction to evaluate the performance achievable by this system. Initial results show that the corrected solution is significantly better compared to the uncorrected case, reducing the standard deviation of the position error from more than 10 m to less than 2 m.
Published in:	Proceedings of the 14th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GPS 2001) September 11 - 14, 2001 Salt Palace Convention Center Salt Lake City, UT
Pages:	2618 - 2626
Cite this article:	Ray, J.K., Kalligudd, K. V., "Development and Test Results of a Cost Effective Inverse DGPS System," Proceedings of the 14th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GPS 2001), Salt Lake City, UT, September 2001, pp. 2618-2626.
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