2050
User Guide
Glossary-67
StarFire
a set of real-time global orbit and clock corrections for
GPS
satellites. StarFire
equipped
receivers are capable of real-time decimeter positioning (see Appendix B).
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 transmitters.
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
.
UTC
see
Universal time coordinated
.
WAAS (Wide Area Augmentation System)
a set of corrections for the
GPS
satellites, which are
valid for the Americas region. They incorporate satellite orbit and clock corrections.
WAD
GPS
(
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
.
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