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Homework10_Sol-1 - GLE/CEE 291 Homework 10 GPS Nonlinear...

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1 GLE/CEE 291 Homework 10 GPS, Nonlinear Least Squares, and Photogrammetry Due: November 14 th , 2012 1) GPS Lab Data Analysis (50%) a) The GPS units have accuracies to within 2-3 meters, so the difference between the averaged coordinates and known values should be within this range. b) The standard deviations for these devices typically range from 1.0 x 10 -5 to 1.0 x 10 -6 . The standard deviations for the DGPS measurements should be less than the SPS measurements. DGPS measurements are corrected based on the known error from a base station. c) The perimeter of Engineer Mall should look more accurate than the perimeter of the CAE building. Objects such as trees and buildings can interfere with signals between the receiver and satellites. d) The area of Engineering Mall is roughly 5,100 m 2 . If you obtained good data, the calculated area should be within 10% of this. e) DGPS is corrected based on the error from a base station with known coordinates. Therefore, DGPS is more accurate than SPS. 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
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