同时给出了一种提高实时控制精度的有效方法，即通过改写系统定时器的分频值达到改变定时器时钟中断频率的值。

And it presents a efficacious method to enhance precision of real time control, which changes value of clock interrupt frequency by changing divided frequency of system tinier.

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本文还给出了基于GPS芯片和CPLD，对系统压控晶振时钟进行校准的实现方法，有效解决了由于长时间使用，晶振自身特性变化，造成的频率偏移现象。

This paper introduces the method of clock calibration to VCXO in system, based on GPS and CPLD. It can solve the problem of frequency offset because of Crystal worse behavior in Long-term use.

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