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Chapter 4 Finding Your Location with the Global Positioning System
GPS (p. 73)
NAVSTAR GPS (p. 74)
GNSS (p. 74)
space segment (p. 74)
constellation (p. 74)
control segment (p. 76)
user segment (p. 77)
channels (p. 77)
single frequency (p. 77)
dual frequency (p. 77)
almanac (p. 77)
ephemeris (p. 77)
C/A code (p. 77)
P code (p. 77)
Y code (p. 77)
pseudorange (p. 78)
trilateration (p. 78)
3D trilateration (p. 80)
Selective Availability (p. 81)
PDOP (p. 81)
multipath effect (p. 82)
DGPS (p. 83)
NDGPS (p. 84)
CORS (p. 84)
SBAS (p. 85)
WAAS (p. 85)
GLONASS (p. 86)
Galileo (p. 86)
Compass (p. 86)
EGNOS (p. 86)
MSAS (p. 86)
geocaching (p. 88)
Key Terms
actual computerized mapping and analysis that underlies those types of in-car
systems, all concepts of geographic information systems.
This chapter’s lab will start putting some of these GPS concepts to work,
even if you don’t have a GPS receiver.
Important note: The references for this chapter are part of the online
companion for this book and can be found at http://www.whfreeman.com/
shellito1e.