navigation acronyms, abbreviations and definitions - International ...

RTTI real-time traffic information
RTTT road transport and traffic telematics
RTZ return to zero
RU receiving unit
RU rover unit
RUC road user charging (a form of EFC)
RULES RA Unified Licensing Executive System
RVR runway visual range
RVSM reduced vertical separation minima
eg ICAO proposal to reduce vertical separation between aircraft from
FL290 to FL410 from 2,000 to 1,000 ft. Introduction in
EUROCONTROL 24 Jan 02.
RW random walk (Kalman filter technique)
RW runway
RWD relative wind direction
RWS relative wind speed
Rwy runway
Rx (RCVR) receiver
RYA Royal Yachting Association
s second
S-57 Standard for exchange of ECDIS data (IHO)
S-AIS Space-based Automatic Identification System
S-band Old radar band 2-4 GHz = 15-7.5 cm
(ITU assigned 2,300-2,500 & 2,700-3,700 MHz).
S-CRPA small controlled reception pattern antenna
S-VDR simplified voyage data recorder (possible retrofit for older ships)
S@tcom BNSC programme (includes sponsorship of Galileo Partnership)
S/N signal-to-noise ratio
S/N 0
signal-to-noise density ratio
S&P simulation & prediction
S&R (SAR) search and rescue
SA (S/A) Selective Availability
The intentional degradation of the GPS Standard Positioning Service.
Was set to give 95% prob accuracies of 100m (300m 99.99% prob)
horizontal, 156m vertical and 334ns in time. Set to zero on 1 May
2000.
SA sand (met)
SA Specific Activity (EU FP6)
SA system architecture
SAAAR Special Aircraft and Aircrew Authorisation Required (runway app’ch)
SaaS Software as a Service (cloud computing)
SAASM selective availablility anti-spoofing module
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March 2012