Time-space difference based GPS/SINS ultra-tight integrated navigation method

Presently there are several shortcomings in Global Positioning System/Strapdown Inertial Navigation System (GPS/SINS) ultra-tight integrated navigation system, for example, presences of modeling errors, heavy computation load and residual time errors, etc. To address these problems, this paper proposes a time-space difference based ultra-tight integrated navigation method. This system carries out difference in time and space which eliminates the troposphere delay, ionosphere delay, satellite and receiver clock error, reduces the system complexity and decreases the adverse impact (frequently changing weather and the low accuracy clocks of receiver and satellites) on the system. In this way the system improves the estimation accuracy and anti-jamming ability. Finally, theoretical analysis and simulation results substantiate that the proposed system has the practicability and superiority over the contemporary ultra-tight integration schemes.