Evaluation and Comparison of Four Methods for Global Navigation Satellite Systems Real time Kinematic Positioning

Abstract:

The troposphere decorrelation method was proposed, which can effectively decrease the correlation of tropospheric parameter and height of single epoch, thus realizing the efficient decouple of height and tropospheric delay and then the millimeter RTK （real time kinematic) results. In this paper, we evaluate the performance of 4 RTK methods by using 11 baselines with baseline lengths from 23 km to 90 km from Shanghai Continuously Operation Reference Station (CORS) network, including the single epoch least squares solutions with and without tropospheric delays, the kinematic Kalman filtering solution and the troposphere decorrelation solution. We highlight the analysis of RTK performance from the troposphere decorrelation method. The numerical experiments indicate that the millimeter accuracies can be obtained for all three coordinate components in the RTK solutions by the troposphere decorrelation method.

Key words:global navigation satellite systems (GNSS); real time kinematics (RTK); subcentimeter/millimeter positioning; troposphere decorrelation; Kalman filtering