Study on Precise Frequency Measurement Based on Sound Card
Making use of sound card of high cost performance to substitute data acquisition card,and combining with virtual instrument technique and beat method frequency measurement realizes high-precision frequency measurement. But the existence of the sampling rate deviation resulting from sound card crystal oscillator inaccuracy greatly reduces frequency measurement precision,so error mathematics model of frequency measurement is built to improve the measurement precision by use of the precise known sine wave signal and the result of measured frequency of sound card. It is made up of linear and sine wave. Linear parameter is gained by least-squares linear fitting algorithm,and sine wave model parameter is acquired by IEEE-STD-1057 algorithm. The experiment results show that the accuracy can reach 10-5/s after the amendment model,which has reference value for precise frequency measurement.
sound card crystal oscillator error of frequency measurement model.
Xu Xin-sheng Wang Guo-qiang Wang Yu-lan Zhang Hui-jun Li Xiao-hui
National Time Service Center.Chinese Academy of Sciences,Xian 710600,China Key Laboratory of Precis Computer Science Department of Huanghuai University,Henan 463000,China National Time Service Center.Chinese Academy of Sciences,Xian 710600,China Key Laboratory of Precis
国际会议
2009 9th International Conference on Electronic Measurement & Instruments(第九届电子测量与仪器国际会议 ICEMI2009)
北京
英文
1532-1535
2009-08-16（万方平台首次上网日期，不代表论文的发表时间）