SL869x-V2 Family Product User Guide
1VV0301175 Rev. 9 Page 89 of 93 2021-07-15
a tunnel), and re-establishes a valid fix after the signal is restored.
Contrast with Reset and 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. Please refer to Cold Start, Warm
Start, and Hot Start. Contrast with Reset and Reacquisition.
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.
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.
Real Time Clock
An electronic device (chip) that maintains time continuously while
powered up.
Surface Acoustic Wave filter
Electromechanical device used in radio frequency applications.
SAW filters are useful at frequencies up to 3 GHz.
Satellite Based Augmentation System
A system that uses a network of ground stations and geostationary
satellites to provide differential corrections to GNSS receivers.
These corrections are transmitted on the same frequency as
navigation signals, so the receiver can use the same front-end
design to process them. Current examples are WAAS, EGNOS,
MSAS, and GAGAN.
Server-based
Ephemeris
prediction data
Extended Ephemeris (i.e. predicted) data, calculated by a server
and provided to the receiver over a network. It is usually useful for
up to 14 days. Please refer to AGPS.
Temperature-Compensated Crystal Oscillator
The lowest signal level at which a GNSS receiver can maintain
tracking of a satellite signal after acquisition is complete.
Time to First Fix
The elapsed time required by a receiver to achieve a valid position
solution from a specified starting condition. This value will vary
with the operating state of the receiver, the length of time since
the last position fix, the location of the last fix, and the specific
receiver design.
A standard reference level of -130 dBm is used for testing.
Universal Asynchronous Receiver/Transmitter
An integrated circuit (or part thereof) which provides a serial
communication port for a computer or peripheral device.
Wide Area Augmentation System
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