论文部分内容阅读
过去,有几位工作者介绍了大地电磁阻抗张量元素计算中降低偏倚误差的方法.本文中清楚地区分了随机误差与偏倚误差。没有试图设法降低它们,只着重于讨论估计它们的方法.这两类误差主要取决于磁场的极化状况.随机误差随电场信噪比增加而增大,而对磁场噪音欠灵敏。但偏倚误差随磁场信噪比增加而增大。对单个测站装置,导出并讨论了随机误差和最大偏倚误差的表达式。还计算了带一参考站时的随机误差。
In the past, several workers introduced a method of reducing bias errors in the calculation of tensor elements of magnetotelluric impedance in the earth. This paper clearly distinguishes between random errors and bias errors. No attempt was made to reduce them and only focused on the methods of estimating them.These two types of errors are mainly dependent on the polarization of the magnetic field.The random error increases with the increase of the signal-to-noise ratio of the electric field and is less sensitive to the magnetic field noise. However, the bias error increases with the increase of signal-to-noise ratio of magnetic field. For a single station device, the expression of random error and maximum bias error is derived and discussed. Also calculated with a reference station random error.