NavCom SF-3050 Rev.I - Manual (Page 188)

SF-3050 GNSS Product User Guide – Rev I
G-169
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 an 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/GLONASS) a mode of operation in which a GNSS
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 GNSS 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.
civilian code see Coarse Acquisition code.