GNSS衛星選択とドップラー速度複合による一周波RTK-GNSS測位の精度向上

抄録

Real-time kinematic (RTK) positioning is a GNSS positioning technique that can provide precise position within several centimeters of accuracy. In general, it is more difficult to solve GNSS carrier-phase ambiguities using RTK-GNSS in multipath environments with a low-cost single-frequency GNSS receiver than with an expensive dual-frequency GNSS receiver. The purpose of this work is to improve the accuracy of single-frequency RTK-GNSS positioning. The proposed technique consists of two approaches. The first approach is the autonomous selection of the GNSS signals used for RTK-GNSS positioning. We select satellite signals depending on their quality, which can be identified by signal strength. The second approach combines the GNSS Doppler velocity to resolve the integer ambiguities. To estimate more precise initial position and covariance of RTK-GNSS, we use the previous fixed solution and the Doppler velocity. Extending the open-source RTKLIB software for RTK-GNSS positioning, we confirm the effectiveness of the proposed technique.