The Effects of Changing Some Parameters on GPS Accuracy

Abstract

The accuracy of GPS device accomplished by a lot of measured points carefully measured, compared with ancient correct measurements.The procedure is to choose some points (two control points suggested free of error , and three known coordinate points ) , and comparing the standard deviations of the points that affected by changing these parameters .

Place the base on trigs (A&B), and the antenna on the controls and gain there coordinates to compare the results from GPS with fixed values , and find the percent error between the two measurements on each point , and judge about GPS accuracy by finding the standard deviation occurred by changing some parameters .(The controls are A&B buildings in our university and the points are in the university territory ).

The final step is to choose the most accurate parameters and there values according to there standard deviations to be placed into GPS instrument to get high accurate measurements .