一种基于单片机时频信号处理的实用方法  

A practical method to process time and frequency signal based on a microcomputer

作　　者：周渭[1] 周晖 李志勇 

机构地区：[1]西安电子科技大学,710071

出　　处：《宇航计测技术》2000年第1期20-26,共7页Journal of Astronautic Metrology and Measurement

基　　金：国家自然科学基金

摘　　要：一种实用的时间及频率处理方法能够被用于产生精密的时间信号、稳定的相位步跳、频率变化及合成，以及用于精密的时频测量仪器和其它用途中。这种方法是通过改变微计算机机器周期的周期与相位来完成时频信号处理的。它的基础是在微计算机时钟线路中高频时钟信号的脉冲扣除。量化相移及其它锁相及相位处理方法。脉冲扣除和相位延迟可以对不同的应用目的周期性的进行或单步完成，以分别在微计算机的输出处获得频率的变化与合成或相移效果。使用这种方法并在软件控制下，简单的窄频率范围的调整能够在宽频率范围内产生精密的频率及时间信号。在计算机时钟线路中扣脉冲和移相能够改变计算机机器周期的周期与相位。因此在软件的帮助下，计算机输出信号的周期与相位能够被精确地调整。一些频差倍增，相位与时间处理方法、周期扣除方法能在这里采用以获得不同的准确度。使用这种方法，对时间信号处理的准确度能够从几十纳秒到优于１ｎｓ。当与其它技术结合时，还可以获得 １００ ｐｓ～ １０ ｐｓ的准确度。因此该实用技术可以获得广泛的应用。A new practical time and frequency signal processing method can be used to generate an accurate time signal, stable phase step, frequency change and synthesis, and in other practical uses. The method can accomplish the time and frequency signal processing by changing the Period and phase of the machine cycle of a microcomputer. It is based on pulse deletion of high frequency clock signal, quantified phase delay, and other phase lock and variation in a microcomputer clock signal circuit. The pulse deletion and phase delay can be implemented periodically or singly for different purpose, and the frequency change and synthesis or phase shift of the microcomputer output signal can be obtained respectively. With this method and software control, a simple narrow frequency range regulation can generate an accurate fre quency and time signal in a wider frequency range. Many multiple frequency difference, phase and time processing methods, period deletion methods can be used here, and different precision can be obtained. With this method the time signal processing precision can be from several tens us to less than 1 ns. Com bined with other techniques, 100 ps to 10 ps precision can be obtained. Therefore, the practical technique can be used widely.

关 键 词：单片机 时频信号处理 实用方法 

分 类 号：TP274.2[自动化与计算机技术—检测技术与自动化装置]