Reliability of Combined GPS/GLONASS Ambiguity Resolution

This thesis presents an analysis of the impact of combining GPS and GLONASS on the reliability of phase ambiguity resolution (fixing). The rate of correct fixes (i.e. the actual success rate) is investigated, as well as the identification of those fixes as correct or incorrect. Two reliability indicators -- the predicted success rate and the F-test -- are evaluated.;Static analysis reveals that GLONASS full fixing increases actual success rate, fix reliability (using the F-test) and solution availability. The L1/L2 strategy similarly improves success rate and reliability. Widelane is effective for longer baselines due to the smaller effect of phase errors. Testing under overhead foliage induces cycle slips which decrease the observability of the ambiguities.;The processing software PLANSoft(TM) was developed to do GPS/GLONASS ambiguity resolution. GLONASS is incorporated either by partial fixing (only GPS) or full fixing (both GPS and GLONASS). Single- and dual-frequency strategies are also investigated.