Trimble Inc. 6734890 Manual Do Utilizador
SPS852 Getting Started Guide
30
Glossary
1PPS
Pulse-per-second. Used in hardware timing. A pulse is generated in conjunction with a time
stamp. This defines the instant when the time stamp is applicable.
stamp. This defines the instant when the time stamp is applicable.
almanac
A file that contains orbit information on all the satellites, clock corrections, and atmospheric
delay parameters. The almanac is transmitted by a GPS satellite to a GPS receiver, where it
facilitates rapid acquisition of GPS signals when you start collecting data, or when you have lost
track of satellites and are trying to regain GPS signals.
delay parameters. The almanac is transmitted by a GPS satellite to a GPS receiver, where it
facilitates rapid acquisition of GPS signals when you start collecting data, or when you have lost
track of satellites and are trying to regain GPS signals.
The orbit information is a subset of the
AutoBase
AutoBase technology uses the position of the receiver to automatically select the correct base
station; allowing for one button press operation of a base station. It shortens setup time
associated with repeated daily base station setups at the same location on jobsites.
station; allowing for one button press operation of a base station. It shortens setup time
associated with repeated daily base station setups at the same location on jobsites.
base station
Also called reference station. A base station in construction, is a receiver placed at a known
point on a jobsite that tracks the same satellites as an RTK rover, and provides a real-time
point on a jobsite that tracks the same satellites as an RTK rover, and provides a real-time
positions on a continuous real-time basis. A base station can also be a part of a virtual reference
station network, or a location at which GPS observations are collected over a period of time, for
subsequent postprocessing to obtain the most accurate position for the location.
station network, or a location at which GPS observations are collected over a period of time, for
subsequent postprocessing to obtain the most accurate position for the location.
beacon
Source of RTCM DGPS corrections transmitted from coastal reference stations in the 283.5 to
325.0 kHz range.
325.0 kHz range.
BINEX
BInary EXchange format. BINEX is an operational binary format standard for
GPS/
GPS/
research purposes. It is designed to grow and allow encapsulation of all
(or most) of the information currently allowed for in a range of other formats.
broadcast server
An Internet server that manages authentication and password control for a network of
servers, and relays VRS corrections from the VRS server that you select.
carrier
A radio wave having at least one characteristic (such as frequency, amplitude, or phase) that can
be varied from a known reference value by modulation.
be varied from a known reference value by modulation.
carrier frequency
The frequency of the unmodulated fundamental output of a radio transmitter. The GPS L1
carrier frequency is 1575.42 MHz.
carrier frequency is 1575.42 MHz.
carrier phase
Is the cumulative phase count of the GPS or GLONASS carrier signal at a given time.
cellular modems
A wireless adaptor that connects a laptop computer to a cellular phone system for data transfer.
Cellular modems, which contain their own antennas, plug into a PC Card slot or into the USB
port of the computer and are available for a variety of wireless data services such as GPRS.
Cellular modems, which contain their own antennas, plug into a PC Card slot or into the USB
port of the computer and are available for a variety of wireless data services such as GPRS.
CMR/CMR+
Compact Measurement Record. A real-time message format developed by Trimble for
broadcasting corrections to other Trimble receivers. CMR is a more efficient alternative to
broadcasting corrections to other Trimble receivers. CMR is a more efficient alternative to
CMRx
A real-time message format developed by Trimble for transmitting more satellite corrections
resulting from more satellite signals, more constellations, and more satellites. Its compactness
means more repeaters can be used on a site.
resulting from more satellite signals, more constellations, and more satellites. Its compactness
means more repeaters can be used on a site.
covariance
A statistical measure of the variance of two random variables that are observed or measured in
the same mean time period. This measure is equal to the product of the deviations of
corresponding values of the two variables from their respective means.
the same mean time period. This measure is equal to the product of the deviations of
corresponding values of the two variables from their respective means.
datum
Also called geodetic datum. A mathematical model designed to best fit the geoid, defined by the
relationship between an ellipsoid and, a point on the topographic surface, established as the
origin of the datum. World geodetic datums are typically defined by the size and shape of an
relationship between an ellipsoid and, a point on the topographic surface, established as the
origin of the datum. World geodetic datums are typically defined by the size and shape of an
Because the earth is not a perfect ellipsoid, any single datum will provide a better model in
some locations than in others. Therefore, various datums have been established to suit particular
regions.
some locations than in others. Therefore, various datums have been established to suit particular
regions.