An Adaptive Tuning Method of GNSS Carrier Tracking Loop for High Dynamic Application

In the Global Navigation Satellite System (GNSS) receiver, the carrier tracking loop is prone to lose lock in high dynamic environment. Under this condition the receiver cannot provide accurate navigation information without reacquisition of the satellite signal. To improve the performance of the carrier tracking loops for high dynamic application, this paper proposes an adaptive tuning method of the fusion parameters of FLL and PLL (FAFPLL) based on the fuzzy logic control. An indicator is introduced to define the state of the carrier tracking loop. The weights of the PLL and FLL are adaptively adjusted according to the value of the indicator. A designed fuzzy controller is employed to map the nonlinear function of the indicator and fusion weights. In this way, the contributions of the FLL and PLL can be adaptively changed according to the indicator. A trajectory with 60g acceleration and 25g jerks are designed to test evaluate the performance of the proposed algorithm. The results presented by the comparisons of the values of the indicator. The results demonstrated that he proposed method improves the performance of the carrier tracking loop for high dynamic application.