Ionosphere Delay Processing Methods and Positioning Precision of Single Frequency Precise Point Positioning

We analyze the difficulties of single-frequency precise-point-positioning,including ionosphere delay and cycle slip detection.Two solutions of ionosphere delay in single-frequency mode are discussed.Based on these studies,we developed a precise point positioning software for single-frequency observation and use it to deal with the same data with two different methods.The results show that the second solution is better than the first one.Finally,30 d data of different parts of the world were analyzed using this software,and the results prove that the single-frequency PPP accuracy can reach a dm level.