NavCom SF-3050 Rev.I - Manual (Page 196)

SF-3050 GNSS Product User Guide – Rev I
G-177
Spread Spectrum Radio (SSR) a radio that uses wide band, noise like (pseudo-noise)
signals that are hard to detect, intercept, jam, or demodulate making any data transmitted
secure. Because spread spectrum signals are so wide, they can be transmitted at much
lower spectral power density (Watts per Hertz), than narrow band signals.
SV (Space Vehicle) a GPS satellite.
Universal Time Coordinated (UTC) a time standard maintained by the US Naval
Observatory, based on local solar mean time at the Greenwich meridian. GPS time is
based on UTC.
USB Universal Serial Bus.
UTC see Universal Time Coordinated.
WAAS (Wide Area Augmentation System) a US satellite system that provides a
set of corrections for the GPS satellites, which are valid for the North American region.
They incorporate satellite orbit and clock corrections.
WADGPS (Wide Area Differential GPS) a set of corrections for the GPS satellites,
which are valid for a wide geographic area.
WGS-84 (World Geodetic System 1984) the current standard datum for global
positioning and surveying. The WGS-84 is based on the GRS-80 ellipsoid.
Y-code the name given to encrypted P-code when the U.S. Department of Defense uses
selective availability.