SC872-A
Product User Guide
Glossary and Acronyms
1VV0301202 Rev. 6
Page 50 of 53
2018-12-21
GNSS:
Global Navigation Satellite System
Generic term for a satellite-based navigation system with global coverage. The current or planned
systems are:
GPS, GLONASS, BDS,
and
Galileo.
GPS:
Global Positioning System
The U.S.
GNSS,
a satellite-based positioning system that provides accurate position, velocity, and time
data. GPS is operated by the US Department of Defense.
Hot Start:
A hot start occurs when a receiver begins operation with known time, position, and ephemeris data,
typically after being sent a restart command. See
Restart
.
LCC:
Leadless Chip Carrier
A module design without pins. In place of the pins are pads of bare gold-plated copper that are soldered
to the printed circuit board.
LNA:
Low Noise Amplifier
An electronic amplifier used for very weak signals which is especially designed to add very little noise to
the amplified signal.
Local Ephemeris prediction data:
Extended Ephemeris (i.e. predicted) data, calculated by the receiver from broadcast data received from
satellites, which is stored in memory. It is usually useful for up to three days. See
AGPS.
MSAS:
MTSAT
Satellite Augmentation System
The Japanese
SBAS
system.
MSD:
Moisture sensitive device.
MTSAT:
Multifunctional Transport Satellites
The Japanese system of geosynchronous satellites used for weather and aviation control.
Navigation Sensitivity:
The lowest signal level at which a GNSS receiver is able to reliably maintain
navigation after the satellite signals have been acquired.
NMEA
: National Marine Electronics Association
QZSS
: Quasi-Zenith Satellite System
The Japanese
SBAS
system (part of MSAS).
Reacquisition
: A receiver, while in normal operation, loses RF signal (perhaps due to the antenna cable
being disconnected or a vehicle entering a tunnel), and re-establishes a valid fix after the signal is
restored. Contrast with
Reset
and
Restart.
Restart
: A receiver beginning operation after receiving a restart command, generally used for testing
rather than normal operation. A restart can also result from a power-up. See
Cold Start, Warm Start,
and
Hot Start.
Contrast with
Reset
and
Reacquisition.
Reset:
A receiver beginning operation after a (hardware) reset signal on a pin, generally used for testing
rather than normal operation
.
Contrast with
Restart
and
Reacquisition.
RoHS:
The Restriction of Hazardous Substances
Directive on the restriction of the use of certain hazardous substances in electrical and electronic
equipment, which was adopted in February 2003 by the European Union.
RTC
: Real Time Clock
An electronic device (chip) that maintains time continuously while powered up.
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