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Data Hacking

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Glossary<br />

Selective availability An intentional random error in the clock time of the civilian GPS signal that was<br />

intended to degrade the signal and thereby only allow the military/government to have access to precise<br />

location information. This was removed in May 2000.<br />

Space segment The satellite component of the GPS network.<br />

SPS Another name given to the civilian C/A code.<br />

SV Space vehicles. Another name for the GPS satellites.<br />

Track The plot of a route taken or a route to be followed, stored on a GPS.<br />

True north The direction to the north pole.<br />

User segment The receivers using the GPS signals.<br />

UTC Universal Coordinated Time. The time system formerly known as Greenwich Mean Time (GMT).<br />

WAAS Wide Area Augmentation System. A system of ground-based beacons or additional satellites<br />

that improve the baseline GPS system. To make use of this, you need a WAAS-enabled GPS receiver.<br />

Warm start The power-on sequence in which the GPS receiver does not need to download the almanac<br />

data before establishing a fix.<br />

Waypoint A position stored in the GPS.<br />

XTE See Crosstrack error.<br />

Y-code Another name given to the encrypted P-code.<br />

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