ION Technical Content
All DOP GPS Optimization
| Abstract: | Current GPS receivers employ PDOP, Position Dilution of Precision (or GDOP, Geometric Dilution of Precision) optimization satellite selection to select four (or fewer) GPS satellites to compute the navigation solution. This approach works quite well for situations where good accuracy is desired in horizontal position (for instance latitude and longitude). For certain applications, such as landing operations requiring better accuracy in altitude, the all DOP (Dilution of Precision) GPS optimization is proposed. The requirements for landing operations, and current capabilities of DGPS systems, are briefly summarized. In the proposed all DOP GPS optimization, a TDOP (Time DOP) optimized set of satellites is used to obtain the best estimate of the time bias error effects. Then with the time bias correction, the best set of satellites is chosen for the coordinate of interest, say vertical for altitude. In this manner the best data that is available is utilized, while data which may be less accurate and can contaminate the solution is rejected. A detailed procedure is presented for all DOP optimization. An analysis is presented showing the expected performance improvement using all DOP GPS optimization versus PDOP GPS optimization. Expected field test results using an all-in-view receiver with high performance credentials to minimize other obscuring error sources are presented. Both GPS and DGPS modes of operation are presented. Low multi-path, and significant multi-path environments as may be experienced in the field are discussed. |
| Published in: |
Proceedings of the 5th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GPS 1992) September 16 - 18, 1992 Albuquerque, NM |
| Pages: | 33 - 41 |
| Cite this article: | Maki, Stanley C., "All DOP GPS Optimization," Proceedings of the 5th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GPS 1992), Albuquerque, NM, September 1992, pp. 33-41. |
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