The Effect of GPS Signal Quality on the Ambiguity Resolution Using the KTH method

Since the last decade the integer phase ambiguity resolution has become one of the most important elements in the GPS field because of its impact on the accuracy. Several scientific researches have been carried out for resolving the integer ambiguity. One example of such kind of researches is the Quick GPS ambiguity resolution for a short baseline (KTH method). The study focus on investigation of the impact of the selected elements: the GPS signal, the observations elevation angles and the GPS satellites azimuth on the KTH method performance for resolving the integer phase ambiguity. The investigation has covered carrier phase measurements for three baselines with length less than one km for each and “GeoGenius” software package as the quality control for the fixed ambiguities of the KTH method results. The KTH method achieved more than 84 percent of success in the level of signal strength 8; about 90 percent for elevation angel between (55 65)° and approximately 94 percent for GPS satellite azimuth in range of (130 150)°. The overall results showed a clear correlation of about 0.9 for most of the cases between KTH method and the selected components. In such a case it leads to a high performance of the method under healthy reliable observations conditions, and the method has the capability to yield outcomes expected to be within a specific accuracy by knowing the level of group elements (signal strength, elevation angle and satellite azimuth) that have been used