User's Manual

DRAFT TrimTrac Locator Technical Manual 45
Glossary
The Glossary defines technical terms and abbreviations used in this manual. It
includes terms from the fields of wireless communications and GPS technology.
0D Time only in GPS terminology.
2D Two dimensions and time in GPS terminology.
3D Three dimensions and time in GPS terminology.
2D GPS Two-dimensional GPS position fix and time.
3D GPS Three-dimensional GPS position fix and time.
Altitude Height above mean sea level (MSL).
ASCII American Standard Code for Information
Interchange.
C/A Coarse Acquisition code used to receive GPS signals
with receivers designed operate using SPS (Standard
Positioning Service).
Checksum The message checksum field provides for a two-digit
hexadecimal checksum value, which is computed by
XOR’ing all characters from the beginning of the
sentence up to and including the * character. The
checksum is always the last element of the sentence
before the message < delimiter. The use of checksums
can help in instances where the communication
channel is noisy.
ETSI European Telecommunications Standards Institute.
GPS Global Positioning System.
GSM Global System for Mobile communications.
IMEI International Mobile Equipment Identity.
IMSI International Mobile Subscriber Identity.
Latitude Latitude coordinate of position fix with positive value
indicating North.
LED Light-Emitting Diode.
Longitude Longitude coordinate of position fix with positive
value indicating East.
PC Windows-compatible Personal Computer.
PCS Personal Communications Service.