Realization and application testing of real-time kinematic on smartphone

With the development of chip technology, the smartphone has become the most widely used Global Navigation Satellite System (GNSS) device, and its ability to provide location services is gradually being demonstrated. To investigate the feasibility of using a smartphone as a professional GNSS device and to take advantage of the opportunity of opening GNSS raw measurements on an Android smart terminal, an real-time kinematic (RTK) positioning APP was designed and implemented, and a high-precision positioning application test was performed based on it. The results show that the APP's real-time positioning accuracy can achieve about 1 dm under static conditions, and can reach sub-meter levels in plane and 1 to 2 m in vertical under dynamic situations of pedestrians and automobiles. The RTK positioning accuracy is significantly higher than that of the built-in chip solution, but the stability is slightly worse. The results also show that when using a smartphone to imitate RTK point measurement, the plane accuracy can reach about 1 m, which is sufficient for sub-meter to meter-level low-precision professional applications such as geographic information collecting and survey.