Performance Improvement of Satellite Navigation System Using Inter-satellite Distance Information

A satellite navigation system calculates the position of a user using measurement values from a satellite, receiver, and broadcast ephemeris, which provides position information about the navigation satellite. However, in scenarios where it is difficult to secure sufficient satellite visibility, such as in a downtown area, the position accuracy of a global navigation satellite system is reduced. This study proposes a navigation algorithm for improving the accuracy of navigation using a measurement value in addition to the existing pseudorange measurement. A user who cannot secure a sufficient navigation visibility uses a standalone scheme that depends exclusively on the pseudorange measurement to estimate the position. The proposed method uses a position estimation algorithm that uses the measured value of the distance between satellites and geometric relation between users to construct a measurement equation, and combines this with the existing pseudorange measurement equation. The results obtained from static and dynamic experiments verify the superior performance of the proposed navigation algorithm.