2050
User Guide
Glossary
.yym files
see meteorological files (where yy = two digit year data was collected).
.yyn files
see navigation files (where yy = two digit year data was collected).
.yyo files
see observation files (where yy = two digit year data was collected).
almanac files a
n almanac file contains orbit information, clock corrections, and atmospheric delay
parameters for all satellites tracked. It is transmitted to a receiver from a satellite and is used by
mission planning software.
alt
see
altitude
.
altitude
vertical distance above the
ellipsoid
or
geoid
. It is always stored as height above
ellipsoid
in
the
GPS
receiver but can be displayed as height above
ellipsoid
(HAE) or height above
mean sea
level
(
MSL
).
antenna phase center (APC)
The point in an antenna where the
GPS
signal from the satellites is
received. The height above ground of the APC must be measured accurately to ensure accurate
GPS
readings. The APC height can be calculated by adding the height to an easily measured point,
such as the base of the antenna mount, to the known distance between this point and the APC.
APC
see
antenna phase center or phase center
.
Autonomous positioning (
GPS
)
a mode of operation in which a
GPS
receiver computes
position
fixes in real time from satellite data alone, without reference to data supplied by a
reference station
or orbital clock corrections.
Autonomous positioning
is typically the least precise positioning
procedure a
GPS
receiver can perform, yielding
position
fixes that are precise to 100 meters with
Selective Availability on, and 30 meters with S/A off.
azimuth
the
azimuth
of a line is its direction as given by the angle between the
meridian
and the line
measured in a clockwise direction from the north branch of the
meridian
.
base station
see
reference station
.
baud rate (
bits per second
)
the number of bits sent or received each second. For example, a
baud
rate
of 9600 means there is a data flow of 9600 bits each second. One character roughly equals 10
bits.
bits per second
see
baud rate
bps
see
baud rate
BSW
(British Standard Whitworth)
a type of coarse screw thread. A 5/8” diameter
BSW
is the
standard mount for survey instruments.
C/A code
see
Coarse Acquisition code
.
CAN BUS
a balanced (differential) 2-wire interface that uses an asynchronous transmission
scheme. Often used for communications in vehicular applications.
channel
a
channel
of a
GPS
receiver consists of the circuitry necessary to receive the signal for a
single
GPS
satellite.
Glossary-61
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