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March 2014
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Glossary
Glossary
Glossary
Glossary
2D positions
: A two-dimensional GPS position fix that includes only horizontal
coordinates (no GPS elevation) requiring at least three visible GPS satellites.
3D positions
: A three-dimensional GPS position fix that includes horizontal coordinates,
plus elevation requiring a minimum of four visible GPS satellites.
Accelerometer:
The device built into your Quantum GPS that can detect movement and
its intensity.
Activity data
: Information stored in the GPS unit memory and/or transmitted over the
VHF beacon that indicates the level and the type of movement by the study animal.
Almanac data
: Information, transmitted by each satellite, on the orbits and state (health)
of every satellite in the GPS constellation. Almanac data allows the GPS receiver to
rapidly acquire satellites shortly after it is turned on.
Amplitude threshold
:
The amount of movement to exceed in order to be logged into the
data. This threshold is used to filter unwanted movements.
Unit Schedule
: A user created timetable that indicates to the GPS unit when to attempt
GPS position fixes
Data transmission range
: The distance from which a user can successfully retrieve GPS
position data that is stored in the GPS unit.
Datum
: A mathematical model that 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.
Delta period:
The period of time each line of data represents.
Delta time:
The duration in seconds that will represent one line of data. If you set the
delta time to 60 then each line of data will represent 60 seconds of motion.
Dilution of precision (DOP)
: A measure of the GPS receiver/satellite geometry. A low
DOP value indicates better relative geometry and higher corresponding accuracy. The
DOP indicators are GDOP (geometric DOP), PDOP (position DOP), HDOP (horizontal
DOP), VDOP (vertical DOP), and TDOP (time clock offset).
Drop off mechanism
: A device built into the GPS unit that will allow the user to
remotely cause the GPS unit to fall off of the study animal on command.
Glosnass
: The Global Orbiting Navigational Satellite System; the Russian counterpart to
the United States’ GPS system.
Summary of Contents for 4000 Enhanced
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