摘要
本文提出将双谱法时差估计应用到井下超声石油流量计。时差估计对井下超声流量计的准确度起决定性的作用,而传统的互相关时差估计法会受到相关性高斯噪声的影响,导致较大的误差。双谱法时差估计理论上能够完全抑制高斯噪声,因此我们提出用双谱法时差估计替代互相关法来应对有相关性高斯噪声存在的情况。文中通过数值模拟和对实验流量计采集到的数据进行分析,得到了双谱法和传统的互相关法时差估计各自的适用范围和优缺点。
A bispcetrum based method of time-delay estimation is used for the flowmeter in the oil well.The accuracy of the flowmeter in the oil well is determined by the accuracy of time-delay estimation.When we use the cross-correlation method,high accuracy could not be achieved in existence of correlated Gaussian noise.However,because the bispcetrum based method of time-delay estimation could theoretically eliminate Gaussian noise,we use the bispcetrum method as the substitution of the cross-correlation method.Both simulation and analysis of data acquired by the ultrasonic flowmeter prototype are implemented to reveal the differences between bispectrum based method and cross-correlation method.
出处
《信号处理》
CSCD
北大核心
2010年第2期262-266,共5页
Journal of Signal Processing
关键词
双谱
互相关
时差估计
超声测流
井下
bispectrum cross-correlation time-delay estimation ultrasonic flowmeter oil well
