一种多周期测量频率的方法及应用
摘 要：利用多周期测量方法，通过对信号进行分频准确测量出气压传感器输出信号的周期和频率。利用P89LPC935内部的A/D转换器测量环境温度进行温度补偿，选取准确度优于5 ppm的晶振，测量周期的误差最小可控制在0.001 1 μs。该测量方法成功地应用于与河南省气象局合作开发的自动气象站中。用多周期测量的方法快速准确测量信号的频率（周期）基于2个条件：信号是连续的；单片机的晶振必须使用外接的高精度、高稳定晶体振荡器。
关键词：频率测量；多周期测量法；测量误差；A/D转换器
Method and Appication of Multi-period Frequency Measurement
LI Guangming,YANG Lei
(Dongguan University of Technology,Dongguan,523808,China
Abstract： To measure frequency of the atmospheric pressure by using the electrically-induced resonator pressure transducer,multi-period measurement method is employed,which obtains accurate results by dividing signal frequency.Accurate atmospheric pressure is obtained via temperature compensation with the environmental temperature acquired from the ADC on P89LPC935.The prerequisite for using this period measuring method is choosing a crystal oscillator with its accuracy better than 5 ppm.Thereby the minimum measuring error can be controlled within 0.001 1 μs.The presented measuring method is successfully used in the automatic weather station developed through our cooperation with Henan Weather Bureau.The two important conditions for using the multi-period measurement method to measure a signal period (frequency accurately and fast are: the signal has highly-stable frequency and is a continuous signal;the crystal oscillator of the single chip is an external highly-accurate and highly-stable crystal oscillator.
eywords：frequency measurement;multi-period measurement method;measuring error;A/D converter
1 引 言
多周期测量法是一种...
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