Real-time simulation system of satellite navigation observation

The characteristic of high precise and real-time simulation of satellite navigation observation was analyzed in this paper. And the principle, function composing and high fidelity mathematical models used in observation simulation were studied. Because of the different time constrains to realize different models, the architecture of simulation system was mainly divided into three parts: namely non real-time layer, week real-time layer and strong real-time layer. Then a distributed real-time simulation system, which was suitable for multiple type satellite navigation observation simulation, was established based on this architecture, Finally, an investigation scenario was performed, and results showed that the simulation system could satisfy the strong real-time demand, and the simulated observation reached a good degree of accuracy.