A new approach for mitigating carrier phase multipath errors in multi-gnss real-time kinematic (RTK) receivers

In this paper, we introduce a new approach for RTK positioning using triple-frequency combinations of GNSS measurements in presence of carrier phase multipath. The proposed method is based on a modification of the LAMBDA method, where the a-priori information on multipath errors is exploited as a constraint in the optimization and ambiguities search process to mitigate the effect of multipath. Triple-frequency combinations of measurements is used to formulate a new carrier phase multipath index, then incorporate it as additional constraint in the LAMBDA method cost function for multi-frequency ambiguity resolution. Simulations and real experiments shows the effectiveness of the developed scheme.