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navigation acronyms, abbreviations and definitions - International ...

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SP St<strong>and</strong>ard Precision (GLONASS service)<br />

Accuracy 57-70 m hor <strong>and</strong> 70 m vert, vel 15 cm/s (99.7%).<br />

SPA Special Protection Area (EU Habitats & Bird Directives)<br />

SPAC Satellite Positioning Research <strong>and</strong> Application Centre (Japan)<br />

SPACE Seamless Positioning in All Conditions & Environments (Pinpoint proj)<br />

Nottingham University, Leeds University, Imperial College, University<br />

College London, EADS Astrium, CAA, Leica GeoSystems, Nottingham<br />

Scientific, OS, QinetiQ, BAE Systems, Thales.<br />

Space IGS Space Innovation <strong>and</strong> Growth Strategy (UK - 2010)<br />

Joint Government, industry <strong>and</strong> academia 20-year strategy for UK.<br />

SPACECOM US Space Comm<strong>and</strong> (Colorado Springs)<br />

SPAD signal passed at danger (railway)<br />

SPD speed (own (ship’s) speed in dead ahead direction)<br />

SPEED Support Platform for EGNOS Evolution <strong>and</strong> Development<br />

SpeedAlert EC (DG TREN) project to harmonise in-vehicle speed alert systems<br />

One-year project from May 2004.<br />

SPF Service Products Facility (Galileo)<br />

SPF single-point-failure<br />

SPI ship-port interface (IMO)<br />

SPI Surveillance Performance <strong>and</strong> Interoperability (EUROCONTROL)<br />

SPIRE Space Inertial Reference Equipment (US first airborne INS - 1953)<br />

SPL signal power level<br />

SPM single point mooring<br />

SPOC SAR Point of Contact<br />

Spoofing Broadcasting deliberately erroneous nav signals so receivers give<br />

the wrong position while appearing to be working correctly.<br />

SPOS Ship Performance Optimisation System<br />

SPOT Satellite Pour l'Observation de la Terre (GPS location messenger)<br />

SPRUC satellite positioning based road user charging<br />

SPS St<strong>and</strong>ard Positioning Service of GPS<br />

The service available to civilian users with a st<strong>and</strong>-alone receiver<br />

having access only to the C/A code <strong>and</strong> L1 carrier.<br />

Sps symbols per second<br />

SPWG Strategic Planning Working Group (IHO)<br />

SQ squalls (met)<br />

SQL Structured Query Language (for databases)<br />

SQM signal quality monitoring<br />

SQS Safety Quality Management <strong>and</strong> St<strong>and</strong>ardisation (EUROCONTROL)<br />

squawk to transmit via a transponder<br />

SQuID superconducting quantum interference device (microscopy)<br />

sr steradian (solid angle)<br />

SR1 small hail or snow pellets (met)<br />

127<br />

March 2012

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