Embedded system of time uniform based on DSP

We introduced a design method of DSP-based System of time uniform, which combine the GPS and the Compass to calibrate the time. The system can use UTC (Coordinated Universal Time) of the GPS or the Compass for time base, to generate absolute time and different frequency of synchronous signals. We used DSP (Digital Signal Processor) to calculate the satellite information which includes the UTC time. After getting the UCT time information, put it into the CPLD (Complex Programmable Logic Device) for correction of time delay and serialization to output. Meanwhile, we divided 1PPS ( one-pulse-per-second) signal of the GPS and the Compass into 20Hz, 50Hz, and 800Hz synchronous signal. And we analyzed the precision of time and frequency. To conclude, the uncertainty of system absolute time is less than 100ns, the uncertainty of system synchronous signals is less than 20ns.This system is easy and flexible for use, stable and reliable in performance.