When the existing integrated navigation system is powered on,the system has no time information.The integrated navigation system will have time information only when the global navigation satellite system (GNSS) time information is obtained.This paper adds a time holding circuit to the integrated navigation system,and completes the time initialization,time holding and time correction of the time holding circuit through FPGA.When the system is powered off,the internal battery is used to supply power to the time holding circuit to realize the time holding function of the integrated navigation system.The test results show that the time holding circuit meets the requirements of time accuracy.
Key words
FPGA /
integrated navigation /
time holding circuit /
DS3234
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