4 FACTORS INFLUENCING GPS ACCURACY
Error sources can be categorized into the following three major types: satellite errors,
atmospheric errors, and receiver and antenna errors. The satellite errors are normally due
to error in orbital modeling of the satellites and to satellite clock errors. The atmospheric
errors are due to the residual Tropospheric and Ionospheric delays. The receiver and
antenna errors are due to noise, receiver clock, interference and multipath errors see
Figure 4.1.