Abbreviations - Sierra Wireless AirPrime XS1110 Command Reference Manual

B: Abbreviations
Table B-1: Acronyms and Definitions
Abbreviation
AGNSS
BeiDou
EPE
Geofencing
GLONASS
GNSS
GPS
HDOP
LLE
Rev 3.1 Jul.20
Meaning
Assisted Global Navigation
Satellite System
Estimated Position Error
Global Navigation Satellite
System
Global Positioning System
Horizontal Dilution of Precision
Long Life Ephemeris
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Definition
While using a GPS / GNSS receiver in an
inadequate signaling situation, for example, the
module is applied in a building where only a
weak signal can be received, it may depend on
periodically receiving the orbital information of
the target satellite from a calculating source
other than the GPS satellite itself. The data
received is known as assisted GNSS data.
Satellite navigation system operated by China
EPE is a statistical level of confidence generated
for each position. It is measured by horizontal
position error in feet or meters based upon a
variety of factors including Dilution of Precision
(DOP) and satellite signal quality. However, this
is not an error message. It is only a reference to
inform users how accurate the position of the
GPS is displaying at that time. Furthermore, a
wide range of factors can have impacts on this
reference, such as multipath, number of
satellites, SNR, satellites elevations and period
of time GPS unit is switched on prior to
recording and how long users stay in one
location to record the position.
Geofencing defines a geographic boundary. For
example, if this "virtual barrier" is established in
the module, the further application is able to use
triggers that send a text message, email alert, or
app notification when an objective enters/ leaves
the specified area.
Satellite positioning system operated by Russia
A generic standard term for satellite navigation
systems that provide autonomous geo-spatial
positioning with global coverage.
Satellite positioning system operated by USA
This measures the geometric quality of a GPS
satellite configuration in the sky. HDOP is a
factor that determines the relative accuracy of a
horizontal position.
Predicts satellite orbit information (ephemeris),
with high accuracy, by offering satellite
information from the AGPS server for one day or
more
B
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