Transcription of Chapter 5 GPS Absolute Positioning Determination By using ...
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Chapter 5 GPS Absolute Positioning Determination By using ...
EM 1110-1-10031 Aug 96 Chapter 5 GPS Absolute Positioning DeterminationConcepts, Errors, and Accuracies5-1. GeneralNAVSTAR GPS Determination of a point position on theearth actually uses techniques common to conventionalsurveying trilateration:an electronic distance measure-ment resection. The user s receiver simply measures thedistance ( , ranges) between the earth and theNAVSTAR GPS satellite(s). The user s position is deter-mined by the resected intersection of the observed rangesto the satellite range creates a spherewhich forms a circle (approximately) upon intersectionwith the earth s surface. Given observed ranges to twodifferent satellites, two intersecting circles result fromwhich a horizontal (2D) position on the earth can a third satellite range creates threespheres, the intersection point of which will provide theX-Y-Z geocentric coordinates of a point.
EM 1110-1-1003 1 Aug 96 Chapter 5 GPS Absolute Positioning Determination Concepts, Errors, and Accuracies 5-1. General NAVSTAR GPS determination of a point position on the
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