AGRICULTURE
Almanac
Antispoofing (AS)
Bandwidth
Bit
Carrier
Carrier Phase
Carrier-to-Noise Power Density (C/N0)
Channel
Chip
Coarse Acquisition (C/A)-Code
Cold Start
Control Segment
Course over the Ground
Cycle Slip
Demodulation
Differential GPS (DGPS)
Dilution of Precision (DOP)
Distance Root Mean Square (DRMS)
Electromagnetic Spectrum
En Route
Ephemeris
Epoch
Error Budget
Fix
Frequency
Frequency Modulation
Geodesy
Geodetic Datum
Geoid
Geometric Dilution of Precision (GDOP)
Geostationary Satellites
GLONASS
GNSS
GPS (System) Time
GPS Week
Height Aiding
Horizontal Dilution of Precision (HDOP)
Inmarsat
Interference
Ionosphere
Keplerian Elements
Kilohertz
Kinematic
L1 Frequency Band
L2 Frequency Band
Latitude
L-band
Line of Position (LOP)
Longitude
Megahertz (MHz)
Modulation
Multipath
Nautical Mile
Navigation Message
NMEA 0183
Noise
Notice Advisory to GLONASS Users (NAGU)
Notice Advisory to NAVSTAR Users (NANU)
Orthometric Height
Oscillator
Parity
Precision (P)-Code
Pseudorandom Noise (PRN) Code
Pseudorange
Quadrifilar Helix
Ranging
Receiver Autonomous Integrity Monitoring (RAIM)
RINEX
RTCM SC-104
Selective Availability (SA)
Signal to Noise Ratio (SNR)
Space Segment
Spatial Decorrelation
Spoofing
Spread-Spectrum
Temporal Decorrelation
Tropospheric Delay
Universal Time Coordinated (UTC)
UT1
Warm Start
World Geodetic System 1984 (WGS 84)
Y-Code
Z-Count
Selective Availability (SA)
The policy and procedure of denying to most non-military GPS users the full accuracy of the system. SA is achieved by dithering the satellite clock (delta-process) and degrading the navigation message ephemeris (epsilon-process). Currently SA primarily uses the delta-process. The effects can be removed with encryption keys or through DGPS techniques. Was switched off in 2000.