Method of High Accuracy Pseudorange Generation for Real-time High Dynamic GNSS Signal Simulator

Increasing the accuracy of pseudorange (PR) generation is one of the key technologies in developing real-time high dynamic globol navigation satellite system(GNSS) signal simulator. In this work, the proposed method takes user trajectory coordinates as input, and uses Keplerian parameters to calculate satellite positions for constellation simulation and parameter generation. To achieve high accuracy true range, the coordinate differences due to ECEF rotation should be considered during iterative calculation of PR. For PR generation, a cubic spline based algorithm is proposed to calculate the 3rd order PR polynomial coefficients directly. Above measures avoid the complexity and inaccuracy in existing algorithms which need to calculate satellite-user line-of-sight dynamic parameters such as high order derivatives for PR errors, satellite positions and user position respectively. Simulation result shows that the fitting error of proposed method is below 0.1 mm.