ION Technical Content
DGPS for Space and Return
| Abstract: | DGPS has been studied by numerous organizations as a highly sought after accuracy improvement to standard GPS, particularly with selective availability applied. Flight tests of DGPS have been conducted by NASA LaRC and NASA JSC. The operation of DGPS, and requirements for use for space and return are detailed. These include proximity operation near Space Station Freedom, and the approach and landing phase of recoverable vehicles. The Microwave Scanning Beam Landing System performance requirements for Shuttle land- ings are presented, along with commercial aircraft ILS performance; and the DGPS flight test results are compared with these requirements. An expected significant DGPS performance im- provement for approach and landing, and other con- strained operations, is proposed by altering hard- ware and software of conventional GPS receivers to use VDOP optimization satellite selection, and if necessary, HDOP, LDOP (Lateral Dilution of Precision), and/or DDOP (Direction?1 Dilution of Precision) optimization satellite selection . Estimates are made of expected accuracy improvements as related to landing operations. Other DGPS system improvements are evaluated, and recommendations made, including: a) Replacement of pseudo range data with naviga- tional position data in DGPS message structure. b) DGPS reference receiver and user receiver design specifics. c) Tailoring of approach and landing requirements for DGPS operation. This is a first look at a different type of DGPS configu- ration. These promising analysis results should be followed up with experimental field testing. Imple- mentation options address use of current and near term technology. |
| Published in: |
Proceedings of the 1992 National Technical Meeting of The Institute of Navigation January 27 - 29, 1992 Catamaran Resort Hotel San Diego, CA |
| Pages: | 349 - 358 |
| Cite this article: | Maki, Stanley, "DGPS for Space and Return," Proceedings of the 1992 National Technical Meeting of The Institute of Navigation, San Diego, CA, January 1992, pp. 349-358. |
| Full Paper: |
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