Sierra Wireless AirPrime XS1110 Command Reference Manual page 52

AirPrime XS1110 AT Command Reference
Table B-1: Acronyms and Definitions (Continued)
Abbreviation
NMEA
PPS
PVT
QZSS
RTC
SBAS
SGE
TCXO
VDOP
Rev 3.1 Jul.20
Meaning
The National Marine
Electronics Association
pulse-per-second
Position, Velocity, Time
Quasi-Zenith Satellite System
Real-Time Clock
Satellite-based Augmentation
Systems
Self Generated Ephemeris
Temperature Compensate X'tal
(crystal) Oscillator
Vertical Dilution of Precision
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Definition
This is a standard data format supported by all
GPS manufacturers. The output definition
consists of latitude, longitude, time, etc.
This is an electrical signal that has a width of
less than one second, with edges that sharply
increases or abruptly decreases and repeats
accurately and precisely once per second. In
this application, PPS signals are output by GPS
receivers.
A GPS receiver is an L-Band radio processor
capable of addressing navigation equations that
decide the user's position, velocity, and precise
time by dealing with the signal broadcasted by
GPS satellites.
This is a four-satellite regional time transfer
system and a satellite-based augmentation
system development operated by Japan.
This is present in almost any electronic device
that needs to have an accurate time.
The accuracy and reliability of GNSS
information are improved by SBAS via
correcting signal measurement errors and via
providing information about the accuracy,
integrity, continuity and availability of its signals.
These systems also support wide-area or
regional augmentation by applying the additional
satellite-broadcast messages. Correction
messages are created and sent to one or more
satellites for broadcast from the ground stations
used measurements to end users as differential
signal.
Predicts satellite orbit information (ephemeris)
with high accuracy by accumulating satellite
information internally for more than one day.
A TCXO adjusts the frequency of the oscillator
to compensate for the changes that will occur
because of temperature changes.
This measures the geometric quality of a GPS
satellite configuration in the sky. VDOP is a
factor that determines the relative accuracy of a
vertical position.
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