For its simplicity and cost effectiveness in implementation, the Inverted DGPS is well suited for some specific applications like automatic vehicle location system (AVL), where the monitoring station tracks the vehicle location in the street. Usually, the Inverted DGPS has two problems. The first is that sometimes the reference station observes fewer satellites than the vehicle does, so the IDGPS correction can't be applied. The second is that DGPS system can suffer from performance degradation due to the manipulated vehicle location information by the navigation filter inside the user GPS receiver. To resolve these problems, an enhanced IDGPS system is proposed: The pseudorange measurement obtained by the vehicle GPS receiver is transmitted to the reference station instead of the vehicle position information in NMEA format. Multi-reference IDGPS stations are used for improving differential correction. The proposed enhanced Inverted DGPS system is implemented and the test results are presented. For the covering abstract see IRRD E102946.


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Filing Info

  • Accession Number: 00781184
  • Record Type: Publication
  • Source Agency: Transport Research Laboratory
  • ISBN: 89-950073-2-X
  • Files: ITRD
  • Created Date: Jan 7 2000 12:00AM