navigation acronyms, abbreviations and definitions - International ...

DBF digital beam-forming (antenna)
dBi decibels, isotropic
DBTF database terrain following
dBW decibel watts (power level relative to 1 watt)
DCB differential code bias (eg of a GPS satellite)
DCDB Data Centre on Digital Bathymetry
DCE data cercuit-terminating equipment
DCN document change notice
DCPC direct controller/pilot communications
DCPS differentially corrected positioning service
DCT direct
DCW Digital Chart of the World (1:1M air nav chart from US DMA)
DD double-differencing (GNSS relative positioning)
DDC delays, diversions and cancellations
DDC digital down-convertor
DDF divided difference filter
DDG dispatch deviation guide (associated with MEL)
DDGI German unbrella organisation for geoinformation
DDM difference in depth of modulation
DDR demand data repository
DDR detailed design review
DDRC Diving Diseases Recompression Chamber (Poole, UK)
DDV Design, Development and In-Orbit Validation (phase of Galileo)
dead ahead direction ahead of a (ship’s) fore-and-aft line
Dec declination
Decca hyperbolic LF navigation system
In UK funded by THLS until 31 Mar 00.
DECT Digital European Cordless Telecommunications
Short range speech or data system. TDMA on 1.88-1.90 GHz.
DEFRA Department for the Envirnonment, Food and Rural Affairs (UK)
deg degrees
DELTA Specification for vehicle DSRC modules and OBTs (EC)
DEM digital elevation model/map (for charting etc)
Demeter Digital Electronic Mapping of European Territory
Covers data standards for road networks for nav systems.
Dep departure
Distance between 2 meridians at any given parallel of latiude,
expressed in nautical miles.
DERA Defence Evaluation and Research Agency (UK)
On 1 Apr 01 split into New DERA and the Defence Science and
Technology (DST) Lab. New DERA becomes ‘QinetiQ’ on 2 Jul 01.
DES Data Encryption Standard
33
March 2012