C-10 PN: 10580-00343 Rev. H S820E UG
C-2 Glossary Terms Glossary
GPS : The Global Positioning System (GPS) is a space-based
global navigation satellite system (GNSS) that provides
reliable location and time information in all weather
and at all times when and where an unobstructed line
of sight is available to four or more GPS satellites. The
system is maintained by the United States government
and is freely accessible by anyone with a GPS receiver.
The Global Positioning System is making it possible for
people using ground receivers to determine their
geographic location within 10 to 100 meters. The
satellites use simple mathematical calculations to
broadcast information that is translated as longitude,
latitude, and altitude by Earth-based receivers.
Impedance : Impedance is a measure of RF component electricl
resistance, measured in ohms. In most cable and
antenna systems, the standard impedance is 50 ohms.
Insertion Loss : Insertion Loss (or Cable Loss) is a measure of the total
amount of sugnal energy absorbed (lost) by the cable
assembly. It is measured in dB. S21 (an S-Parameter) is
another name for this measurement. This is often a
pass/fail measurement.
NF : Noise Figure (NF) is a measure of degradation of the
signal-to-noise ratio (SNR) that is caused by
components in a radio frequency (RF) device. The noise
factor (F) of a system is defined as the signal-to-noise
ratio of the input power of the system divided by the
signal-to-noise ratio of the output power of that system.
F (the noise figure) is defined as the decibel value of the
noise factor. = 10log (F) where log uses the base 10, or
common log. T s formula is valid only then the input
termination is at standard noise temperature.
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