NavCom SF-3040 Rev.F - Manual (Page 216)

SF-3040 Product User Guide
– Rev. F
Glossary-214
Signal-to-Noise Ratio (SNR) is a measure of a
satellite’s signal strength.
single-frequency is a type of receiver that only uses
the L1 GPS signal. There is no compensation for
ionospheric effects.
SNR see signal-to-noise Ratio.
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 C).
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.
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.