- 行业: Telecommunications
- Number of terms: 1485
- Number of blossaries: 0
- Company Profile:
Garmin designs, develops, manufactures and markets a diverse family of hand-held, portable and fixed-mount GPS-enabled products and other navigation, communications and information products for the general aviation and consumer markets.
Fixes the GPS receiver's map display so the direction of navigation is always "up."
Industry:Telecommunications
A math model which depicts a part of the surface of the earth. Latitude and longitude lines on a paper map are referenced to a specific map datum. The map datum selected on a GPS receiver needs to match the datum listed on the corresponding paper map in order for position readings to match.
Industry:Telecommunications
The length (in feet, meters, miles, etc.) between two waypoints or from your current position to a destination waypoint. This length can be measured in straight-line (rhumb line) or great-circle (over the earth) terms. GPS normally uses great circle calculations for distance and desired track.
Industry:Telecommunications
A transmission path for the communication of signals and data from a communications satellite or other space vehicle to the earth.
Industry:Telecommunications
A geometric surface, all of whose plane sections are either ellipses or circles.
Industry:Telecommunications
Current satellite position and timing information transmitted as part of the satellite data message. A set of ephemeris data is valid for several hours.
Industry:Telecommunications
The number of repetitions per unit time of a complete waveform, as of a radio wave (see L1 and L2 frequencies in this glossary).
Industry:Telecommunications
A high-tech version of hide-and-seek. Geocachers seek out hidden treasures utilising GPS coordinates posted on the Internet by those hiding the cache.
Industry:Telecommunications
A math model representing the size and shape of the earth (or a portion of it).
Industry:Telecommunications
A specific orbit around where a satellite rotates around the earth at the same rotational speed as the earth. A satellite rotating in geosynchronous orbit appears to remain stationary when viewed from a point on or near the equator. It is also referred to as a geostationary orbit.
Industry:Telecommunications
