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Assignment No 9 - Charles Baxley

# Assignment No 9 - Charles Baxley - SUR 3520 Measurement...

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SUR 3520: Measurement Science Spring 2008 – Section 4218 Assignment No. 9 Student UFID: Student Name: 9.1 Given the following GPS observations and geocentric control station coordinates to accompany figure, what are the most probable coordinates for station E using a weighted least squares adjustment? The vector covariance matrices for the X , Y , and Z values (in meters) given are as follows: Baseline BE University of Florida Geomatics – SFRC

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SUR 3520: Measurement Science Spring 2008 – Section 4218 Compute the relative errors in ppm on the: (a) repeated baselines EA-AE, EB-BE, EC-CE, and ED-DE (b) loop closures EAB, EBC, ECD, and EDA. 9.2 Solve problem 9.1 again using the following assumptions: - measurements are uncorrelated - all baseline components are of the same weight ( σ = 0.005 m) - only baselines AE, BE, CE, and DE are available as observations Find the most probable values for the coordinates of ‘E’ and analyze the results. University of Florida Geomatics – SFRC
SUR 3520: Measurement Science Spring 2008 – Section 4218 Optional Questions 9.3 What are the different sources of errors in GPS measurements? Give an estimate of the approximate value of each of them. 9.4 Write down the GPS range observation equation for: (a) Code (b) Phase Explain the difference. 9.5 Explain, with the help of sketches, the minimum requirement for: (a) GPS Single Point Positioning (b) GPS baseline solution 9.6 Explain briefly why more precise GPS positioning can be done through differencing (relative positioning)?

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