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Glossary-12 Acutime 2000 Synchronization Kit User Guide
Glossary
SPS Standard Positioning Service. Refers to the GPS as available
to the authorized user.
start bit In asynchronous transmission, the start bit is appended to
the beginning of a character so that the bit sync and
character sync can occur at the receiver equipment.
stop bit In asynchronous transmission, the stop bit is appended to
the end of each character. It sets the receiving hardware to a
condition where it looks for the start bit of a new character.
SV Space Vehicle (GPS satellite).
synchronous
communication
A method of sending digital data in which the bits come at
fixed, rather than random, times and are synchronized to a
clock.
TSIP Trimble Standard Interface Protocol. A binary/hex packet
bi-directional protocol, also known as the TANS protocol.
Used by a large number of Trimble sensors. TSIP is the
subset of TANS which is recognized by all Trimble sensors
except the 4000 series. The TSIP protocol is defined in full
in Appendix A.
URA Satellite user range accuracy. The URA is sent by the
satellite and is computed by the GPS operators. It is a
statistical indicator of the contribution of the apparent clock
and ephemeris prediction accuracies to the ranging
accuracies obtainable with a specific satellite based on
historical data.
UTC Universal Coordinated Time. Uniform atomic time system/
standard that is maintained by the US Naval Observatory.
UTC defines the local solar mean time at the Greenwich
Meridian.
UTC offset The difference between local time and UTC (Example: UTC
- EST = 5 hours).