Abstract: The 5th generation mobile communication system (5G), evolving in positioning technology, provides more solutions for high-precision positioning. To improve the positioning accuracy in dynamic topology environment, a carrier phase positioning method for 5G NR is proposed. Due to the mobility of nodes and terminal in the dynamic topological environment, it is difficult to ensure a reasonable geometric layout, for which a node selection method based on geometric dilution of precision (GDOP) is proposed. On the basis of node selection, by introducing a reference terminal, a multidimensional differential processing of the measurement is performed to eliminate clock offsets. Considering the mobility of access points in dynamic topology environment, the carrier phase measurement equations are established, from which the time-domain difference equations are obtained to estimate the relative position with high accuracy. Then the relative position estimations are fused with TDoA to obtain high accuracy position estimations. With these estimations, the carrier phase measurement equations of multiple moments are linearized to solve integer ambiguities. Simulation results show that the proposed method achieves high accuracy resolution of integer ambiguities and positioning.

Key words: 5G positioning, carrier phase, GDOP, dynamic node, integer ambiguity