Software method to realize time synchronization in GPS/SINS integrated navigation system
Wei Wang · Journal of Chinese Inertial Technology · 2008
GPS/SINS integrated navigation system is widely used in current airplanes. Since traditional integration method cannot eliminate the influence of time synchronization error, a software method to estimate and compensate time synchronization error was proposed based on the investigation of physical concept of GPS/SINS time synchronization error. It realized on-line estimation and compensation of time synchronization error by augmentation of filter state and modification of measurement equations. Simulation results show that when there is 0.7 s time synchronization error, the positioning accuracy of integrated navigation system is about 150 m by traditional integration method, while it is within 10 m by the proposed method.