navigation acronyms, abbreviations and definitions - International ...

R&TTE Radio Equipment & Telecommunications Terminal Equipment Directive
EC legislation applying to vehicles. Mandatory from 8 Apr 01.
R2V roadside-to-vehicle (eg comms)
RA Radiocommunications Agency (UK)
Established as an Executive Agency of the DTI in 1990. Transfer to
Ofcom 29 Dec 03.
RA rain (met)
RA resolution advisory (ACAS/TCAS II)
RA right ascension
RA(T) Restricted Area (Temporary)
Established temporarily around airshows and other events.
RA2 Regulatory Approach to Recreational Aviation (UK CAA)
RAAN right ascension of the ascending node
Equatorial angle from a celestially-fixed direction to the ascending
node of a satellite orbit. Higher orbit gives lower rate - GPS =
14.15º/year, Galileo = 9.01º/year. Hence constellations will drift
relative to each other at 5.14º/year.
RAAS Regional Area Augmentation System
RAC Royal Automobile Club (UK)
RACON RAdar beaCON (active radar beacon or transponder)
RACS road-automobile communication system
rad radian (180/ degrees)
Radar RAdio Detection And Ranging
radio
determination
The determination of position, or the obtaining of information relating
to position, by means of the propagation properties of radio waves
(IMO).
radiolocation Radio determination used for purposes other than radionavigation
(IMO).
radionavigation The use of radio waves in navigation for the determination of position
or direction, or for obstruction warning (IMO).
RAeC Royal Aero Club of the United Kingdom
RAeS Royal Aeronautical Society
RaFFLES Radio Frequency Functional Level Evaluation Suite (UK NATS)
RAFS rubidium atomic frequency standard
RAFS EU rubidium atomic frequency standard evaluation unit
RAI Registro Aeronautico Italiano (Italian CAA)
RAIB Rail Accident Investigation Branch (UK)
RAIDS Rangeless Airborne Information Datalink System
RAIM receiver autonomous integrity monitoring
A technique whereby all navigation sensor information available at a
receiver is autonomously processed to monitor the integrity of the
navigation signals (IMO).
RAL Rutherford Appleton Laboratory (Oxford)
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March 2012