AN INSIDE VIEW OF PSEUDORANGE AND DELTA PSEUDORANGE MEASUREMENTS IN A DIGITAL NAVSTAR GPS RECEIVER
| Autor: | Ward, Phil |
|---|---|
| Rok vydání: | 1981 |
| Druh dokumentu: | Proceedings<br />Text |
| ISSN: | 0884-5123 0074-9079 |
| Popis: | International Telemetering Conference Proceedings / October 13-15, 1981 / Bahia Hotel, San Diego, California The goal of this paper is to develop insight into the real-time nature of GPS observables measured by a digital receiver. The concept of how independent pseudorange and deltapseudorange measurements are captured as a by-product of the code and carrier tracking loops of a digital NAVSTAR GPS receiver is explained. The classical equations defining true range and delta range are derived in terms of pseudorange and delta pseudorange. The actual GPS receiver measurements are then related to these equations. The difference between GPS measurement resolution and precision is treated and the sources of the GPS receiver contribution to the total GPS error are identified. The total GPS error, in terms of user equivalent range error (UERE) and user equivalent delta range error (UEDRE), is characterized. However, an unaided GPS navigation process can filter out only the unbiased random error in the observables, not the total UERE and UEDRE content. Also, the random error in GPS observables is not stationary. Hence, the random error in UERE and UEDRE is identified and characterized. |
| Databáze: | Networked Digital Library of Theses & Dissertations |
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