REPORT ON THE CAPABILITIES AND APPLICATIONS OF GPS

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Authors
  1. Lachapelle, G.
Corporate Authors
Defence Research Establishment Ottawa, Ottawa ONT (CAN)
Abstract
The Global Positioning System (GPS) is a continuous, worldwide, all-weather line-of-sight RF satellite-based system which can deliver instantaneous three-dimensional real-time positioning accuracies in the 20 to 30 m range in single point mode using encrypted user equipment. The satellites broadcast precisely time synchronized signals in the upper part of the UHF using a spread spectrum technique. Both code and carrier phase observables can be used to derive positions. The errors which contribute to the above single point positioning are orbital and timing errors, residual atmospheric delays, receiver noise and multipath, and, in the case of non-encrypted user equipment, Selective Availability and Anti-Spoofing. In the latter case, the single point horizontal and vertical accuracy is 100 m (2 drms) and 156m (2 sigma), respectively. A wide range of user equipment, especially non-encrypted, is now available. Wide and narrow correlator spacing code correlation techniques result in different levels of performance, especially in DGPS mode. Codeless techniques are also available to obtain measurements on L2 in the presence of Anti-Spoofing. The latter technique, although limited by the user's dynamics, is used to resolve the carrier phase ambiguities effectively and to obtain positioning results in the cm level accuracy range. TRUNCATED
Keywords
Satellite navigation;Heading determination;Attitude determination;Precise timing;Guided weapons
Report Number
DREO-CR-97-606 — Contractor Report
Date of publication
01 Apr 1994
Number of Pages
105
DSTKIM No
97-01325
CANDIS No
501748
Format(s):
Hardcopy;Document Image stored on Optical Disk

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