Investigation Ambiguity Resolution in GPS and the Effects of Ionospheric Modeling on Base Vector Components

SUMMARY The GPS technology has given many opportunities for the geodetic applications. Although GPS has many important advantages, there are many error sources that affect on GPS observations. In this study, the effects of initial phase ambiguity at GPS and modeling of ionosphere on base components were researched. Pseudorange observations and phase observations were done in the test network. The solutions that are related to frequency and solutions, which are unrelated to ionosphere, were done by using these pseudorange and phase observations. Fixed solution and float solution have been done for initial phase ambiguity solution. Suggestions about the solution parameters are made at the stage of GPS data analysis from obtained results