Time Foundation in Navigation and Position of China

Time scale is a important foundation of the navigation and position. For a long time, every time issuance system of our nation is not synchronous, which affects the positioning accuracy seriously. And we suggest that satellite navigation sy stem and radio navigation system work on one time standard. This paper discusses the advantage and potential application when satellite navigation system and ra d io navigation work on the same time system. Finally, some key problems, which ne es to be resolved, are pointed out in this paper when the satellite navigation s ystem and radio navigation work on the same time system.