GPS position-finding system and method of finding position of GPS terminal
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United States of America Patent
Stats
-
Jul 17, 2007
Grant Date -
Jun 2, 2005
app pub date -
Nov 4, 2004
filing date -
Nov 12, 2003
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A position-finding system is comprised of a terminal having a global positioning system (GPS) for finding a position thereof, and a server which calculates altitude data, based on terrain data in an area in which the terminal is. The terminal includes a controller which selects one of three-dimensional position-finding in which a position is calculated through the use of four or more satellites and two-dimensional position-finding in which a position is calculated in a circumference in which only three satellites can be captured, in accordance with the altitude data provided from the server.
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