Abstract
To improve accuracy of precise point positioning, we research a method for processing mixed GPS and GLONASS measurements. This method is able to overcome inter-system biases and measurement errors. Processing 17 ISG stations, the results show that North and Up accuracies are improved about 11% and 23% compared with GPS only. For 60 min-utes session, the positional accuracy can be 2cm in the horizontal and the vertical compo-nent. Our results are better than other software packages about 1.5 times in the horizontal and 1.3-2.0 times in the vertical component
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