Definition:
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Accuracy: The measure of how close an estimate of a GPS position is to it's true location, usually in plus or minus feet.
Acquisition Time: The time it takes a GPS receiver to acquire satellite signals and then to determine it's initial position.
Almanac: A data file that contains the approximate orbit information of all satellites, which is transmitted by each satellite within its Navigation Message. It is transmitted by a GPS satellite to a GPS receiver, where it facilitates rapid satellite signal acquisition within GPS receivers. Almanac data is kept current within a GPS receiver to facilitate "hot starts" by permitting the Doppler Shift of each satellite signal to be determined and configuring each tracking channel for this Doppler-shifted carrier frequency.
Azimuth: The horizontal direction from one point on the earth to another, measured clockwise in degrees around the observer's horizon from north. So an object due north has an azimuth of 0°, one due east 90°, south 180° and west 270°.
Back to GPS Glossary
Accuracy: The measure of how close an estimate of a GPS position is to it's true location, usually in plus or minus feet.
Acquisition Time: The time it takes a GPS receiver to acquire satellite signals and then to determine it's initial position.
Almanac: A data file that contains the approximate orbit information of all satellites, which is transmitted by each satellite within its Navigation Message. It is transmitted by a GPS satellite to a GPS receiver, where it facilitates rapid satellite signal acquisition within GPS receivers. Almanac data is kept current within a GPS receiver to facilitate "hot starts" by permitting the Doppler Shift of each satellite signal to be determined and configuring each tracking channel for this Doppler-shifted carrier frequency.
Azimuth: The horizontal direction from one point on the earth to another, measured clockwise in degrees around the observer's horizon from north. So an object due north has an azimuth of 0°, one due east 90°, south 180° and west 270°.
