Homework10_Sol-1

The different position dilutions range from 1 to 2

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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 required. 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 speed 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 dif...
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