navigation acronyms, abbreviations and definitions - International ...

SCOR Scientific Committee on Oceanic Research
SCOS Satellite Control and Operations Support (ESA)
Hard/software system for controlling single/multi satellites. SCOS
-2000 is latest version, used in many systems, including Galileo.
SCT scattered cloud (3-4 oktas)
SCU signal conditioning unit
scUK sports coach UK (trading arm of the NCF)
SCW swept continuous wave (transmission, often a form of jamming)
SD semi-diameter (astro)
SD single-differencing (GNSS relative positioning)
SD standard deviation
For a normal linear distribution 68% of readings should lie within 1 SD
and 95% with 2 SDs.
SDCM System of Differential Correction and Monitoring (GLONASS)
SDF single degree of freedom
SDGPS Smoothed DGPS
SDI spacial data infrastructure
SDK software development kit
SDLC synchronous data link control
SDME speed and distance measuring equipment (maritime)
SDMMC secure digital multimedia memory card
SDO selective door operating (rail)
SDO service data object
SDO Solar Dynamics Observatory
Sat launched 11 Feb 10 to study Sun from geo orbit for 5+ years.
SDR software-defined radio
SDR system design review
SDS Safety Data Sheet (marine)
SDSL Symmetric Digital Subscriber Line
For Web access using normal phone lines at speeds up to 2.3 Mbps.
SDST Single-Double Summer Time (UK - GMT+1 for winter, +2 for summer)
SDTS spacial data transfer standard
SEA strategic environmental assessment
Sea Areas A1-A4 GMDSS areas repressenting differing coverage
A1 - within RT range of at least one VHF coast station in which
continuous DSC alerting is available.
A2 - excludes A1, but covered by at least MF coast station with
continuous DSC alert.
A3 - outside A1 & A2 but covered by Inmarsat with continuous alert.
A4 - outside A1, A2 and A3.
SEC Space Environment Center (US)
SECA SOx Emission Control Area (to control ships’ sulpher emissions)
SED storm enhanced density (of ionosphere)
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March 2012