PPP-RTK that combines Precise Point Positioning and Real-Time Kinematic uses State Space Representation (SSR) corrections. These messages are composed of five parts: satellite orbit, satellite clock, satellite bias, ionosphere and troposphere corrections. This technique is one-way communication and can control bandwidth and transmission frequency, so it is suitable for precise positioning of mobile platforms. Jenoba is currently providing SSR corrections using GNSS State Monitoring and Representation Technique (GNSMART) and is sending out SSR messages on a trial basis. PP-Solution in partnership with Jenoba is developing of PPP-RTK algorithms. In this paper, we evaluated performance of PPP-RTK algorithms using Jenoba SSR corrections. In addition to SSR corrections, some appropriate measurement models such as solid Earth tide loading was applied. The data processing is implemented by an extended Kalman filter, and the ambiguity integer of the carrier phase are estimated as float numbers. We tested positioning performance in the Tokyo and Osaka regions. The test results showed stable performance with a horizontal error of ~30 cm.

Keywords: PPP-RTK, PPP, SSR, Kalman filter, Jenoba