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David L. Wilson's GPS Accuracy Web Page
e-mail: dlwilson@erols.com
Pages linked below present mathematical modeling and measured data pertaining to GPS accuracy. Short visits to a survey marker or short GPS observations will not provide a useful appraisal of GPS accuracy. The author continuously collects and analyzes data from a precisely surveyed (independently by a licensed surveyor and the author) point near 38 degrees latitude.
Position accuracy will vary with GPS receiver configuration (receiver and antenna), location (geographic latitude, as it influences HDOP, and surrounding objects possibly blocking reception or causing multi-path reception), satellite constellation status, and ionosphere conditions. Presented in these pages are results thought to be typical of consumer-grade and a few higher-grade GPS receivers. Expensive survey-grade GPS receivers would generally be more accurate than the consumer-grade receivers. The only way to obtain a very precise measurement of the accuracy of a particular GPS receiver/antenna at a location and a particular time is to measure it. Except when otherwise explicitly stated, theses pages are for SA (Selective Availability) off.
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