SL871 Family Product User Guide
1VV0301170 Rev. 9
Page 84 of 89
2021-07-15
Not Subject to NDA
A factor used to describe the effect of satellite geometry on the
accuracy of the time and position solution of a GNSS receiver. A
lower value of GDOP indicates a smaller error in the solution.
Related factors include PDOP (position), HDOP (horizontal), VDOP
(vertical) and TDOP (time).
GLONASS
ГЛОбальная
НАвигационная
Спутниковая
Система
GLObal'naya NAvigatsionnaya Sputnikovaya Sistema
(Global Navigation Satellite System)
The Russian GNSS, which is operated by the Russian Aerospace
Defense Forces
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. Please refer to 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. Please
refer to 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 regional system.
Reacquisition
A receiver, while in normal operation, loses RF signal (perhaps
due to the antenna cable being disconnected or a vehicle entering
