摘要
针对电磁法仪器标定需求,提出基于伪随机互相关辨识的标定方法。论述逆重复m伪随机编码序列的产生方法,从自相关函数出发,推导逆重复m序列的频谱解析式。分析互相关法系统辨识进行仪器标定的原理,给出以逆重复m序列为标定信号源时仪器和磁场传感器的标定方程,并讨论逆重复m序列的参数选取原则。最后,采用相关辨识分别对测量通道和感应式磁场传感器进行标定测试。实测结果表明,标定结果幅度误差小于0.2%,相位误差小于0.5°;标定频率分辨率为0.244 Hz,与传统的方波标定相比效率提高了75倍。该标定方法准确快速,频率分辨率高,可广泛应用于电子仪器标定。
Aiming at the demand of electromagnetic instrument calibration,a calibration method based on cross correlated identification using pseudorandom signal is proposed.The generation method of invert-repeated pseudo-random encoding m-sequence is discussed.The spectral analytic expression of the invert-repeated m-sequence is deduced starting from the self-correlation function.The principle of in-strument calibration based on cross correlated identification is analyzed;the calibration equations of the instrument and the magnetic field sensor are given when the invert-repeated m-sequence is used as the calibration signal source.The parameter selection principle of the invert-repeated m-sequence is discussed.Finally,calibration tests of the instrument and the magnetic field sensor were conducted re-spectively based on correlated identification.The calibration results show that the amplitude error is less than 0.2%,the phase error is less than 0.5 ＆#176;and the calibration frequency resolution is 0.244 Hz;compared with traditional square wave calibration method,the cali-bration efficiency is improved by 75 times.The proposed calibration method is accurate,fast,has high frequency resolution and can be widely used in electronic instrument calibration.
出处
《仪器仪表学报》
EI
CAS
CSCD
北大核心
2014年第8期1721-1728,共8页
Chinese Journal of Scientific Instrument
基金
国家自然科学基金(41004027)资助项目
关键词
标定
电磁法
相关辨识
逆重复m序列
calibration
electromagnetic method
correlated identification
invert-repeated m-sequence
