Satellite virtual atomic clock with pseudorange difference function |
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Authors: | XiaoHui Li HaiTao Wu YuJing Bian and DanNi Wang |
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Institution: | (1) National Time Service Center, Chinese Academy of Sciences, Xi’an, 710600, China |
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Abstract: | Satellite atomic clocks are the basis of GPS for the control of time and frequency of navigation signals. In the Chinese Area
Positioning System (CAPS), a satellite navigation system without the satellite atomic clocks onboard is successfully developed.
Thus, the method of time synchronization based on satellite atomic clocks in GPS is not suitable. Satellite virtual atomic
clocks are used to implement satellite navigation. With the satellite virtual atomic clocks, the time at which the signals
are transmitted from the ground can be delayed into the time that the signals are transmitted from the satellites and the
pseudorange measuring can be fulfilled as in GPS. Satellite virtual atomic clocks can implement the navigation, make a pseudorange
difference, remove the ephemeris error, and improve the accuracy of navigation positioning. They not only provide a navigation
system without satellite clocks, but also a navigation system with pseudorange difference.
Supported by the National Basic Research Program of China (Grant No. 2007CB815502) and the National High Technology Research
and Development Program of China (Grant No. 2007AA12Z300) |
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Keywords: | satellite navigation difference algorithm |
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