Abstract
As part of the modernization of GPS (Global positioning system), a third civil frequency at 1176.45MHz will be added to the GPS system. The carrier-phase differential user will be a prime beneficiary. From the results of ambiguity success rate (ASR) using data from triple frequencies signal simulation, the benefits from the triple frequency in ambiguity resolution (AR) can be confirmed. It can be found that in the triple frequencies, AR will be improved under short and medium baseline (about less than 30km) by using widelane method. But the longer distance user of carrier-phase differential measurement will see limited gains from the new frequency because of ionosphere error. If the geometry-free method is used, AR will become independent on the baseline influence, and can be improved by only reducing carrier phase signal noise.
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