Algorithm for synchronous scheduling of visible satellite based on navigation signal simulator

Aiming at the change of visible satellite constellation in the simulating process of high dynamic signals, an algorithm for synchronous scheduling of visible satellite based on satellite signal simulator was proposed. The software radio system architecture was adopted in the proposed algorithm. Meantime, the cyclic visible satellite judgment and synchronous state control logic were used to carry out the real-time change in simulation channel state and realize the synchronous satellite increasing and reducing operations in any simulation channel. In addition, the proposed algorithm could support the continuant and stable work of satellite signal simulator for a long time, and also exhibit such advantages as high signal simulation precision and low algorithm complexity. Based on the actual test, the positioning results from the receiver were compared with the simulation data from the synchronous simulator. It is proved that when the visible satellite constellation changes, the output signal of the simulator has no obvious step error and no influence on the positioning precision of the receiver.