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Unformatted text preview: SUR 3520: Measurement Science Spring 2007 Section 4218 Assignment No. 9 Due Date: April 16, 2007 Student UFID: 62441221 Student Name: shane christy 9.1 What are the different sources of errors in GPS measurements? Give an estimate of the approximate value of each of them. Satellite Errors Orbit determination (2 m) Clock (2 m) Signal Propagation Errors Ionosphere (4 m) Troposphere (1 m) Receiver Noise (~ /100) Multipath (~ /4) User Equivalent Range Error UERE) ~ 5 m 9.2 Write down the GPS range observation equation for: (a) Code (b) Phase University of Florida Geomatics SFRC SUR 3520: Measurement Science Spring 2007 Section 4218 Explain the difference. 9.3 Explain, with the help of sketches, the minimum requirement for: (a) GPS Single Point Positioning University of Florida Geomatics SFRC SUR 3520: Measurement Science Spring 2007 Section 4218 b) GPS baseline solution 9.4 Explain briefly why more precise GPS positioning can be done through differencing (relative positioning)? Discuss the case of double differencing in term of which errors are eliminated and which errors are reduced or amplified. University of Florida Geomatics SFRC SUR 3520: Measurement Science Spring 2007 Section 4218 9.5 What is the observable in each of the following cases: (a) GPS Single Point Positioning ranges to satellites (b) GPS baseline solution distance between stations (c) GPS network solution distances between multiple baselines 9.6 Draw a sketch to show the geocentric and geodetic coordinates used in locating points on the surface of Earth. University of Florida Geomatics SFRC SUR 3520: Measurement Science Spring 2007 Section 4218 9.7 Explain why a network solution can result in more precise solution than single point or baseline positioning? 9.8 Explain why one epoch of observations are not enough to solve for the double difference phase observation problem? 9.9 What do the elements of the coefficient matrix J represent in 3D space, in case of: University of Florida Geomatics SFRC SUR 3520: Measurement Science Spring 2007 Section 4218 (a) GPS Single Point Positioning (b) GPS baseline solution X,Y,Z range\position measurements; rho is orbit error Both matrices are the same, except the baseline solution has an added receiver case...
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 Spring '09
 Kiker

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