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Unformatted text preview: S.
The different Position Dilutions range from 1 to 2 and the devices usually connect to 8
satellites on average. 2) General GPS Questions (25%)
a) C/A and P code have wavelengths of 300m and 30m, respectively. P code is 10 times more
accurate than C/A code. The higher frequency of the C/A code allows for finer matching
between the GPS and SV codes, which gives a more accurate estimate of the time delay
between the receiver and satellite.
b) Four satellites can be used to determine two possible positions of the receiver. If one of these
positions can be eliminated, then 4 satellites can be used. Otherwise, five satellites are
c) Clock bias – error due to satellite clock offset, drift, and frequency drift
Refraction – variation in density and ions causing electromagnetic waves to bend and change
Satellite ephemeris errors – due to fluctuations in gravity and solar radiation pressure 1 d) DGPS – uses correction to C/A code pseudorange
Rovers are set at unknown points
RTK GPS – uses carrier shift Relative position of Rovers are determined using single, double, and triple
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- Fall '10