如何完成校准插值？

目前，我们进行仅THRU校准，然后执行带有校正的扫描，以在给定量程上测量S21。
我们想知道之后是否有可能以某种方式进行校准校正，如果是，那么如何计算插值校准系数。
1）测量扫描的中心和跨度将不同于校准扫描的中心和跨度，测量扫描以较少的点完成。
如何在这些情况下完成校准插值？
是否只是在一个已知的Ett值之间进行线性外推的情况？
例如，如果我们知道Ett在10.1MHz的Real和Imaginary值分别为0.96和0.11，而Ett在10.2MHz的实数和虚数值分别为0.97和0.10，我们只需计算Ett在10.13MHz的实数和虚数值
是0.963和0.107？
或者是以其他方式计算的插值校准系数？
另外，校准扫描和测量扫描之间的IFBW值的变化是否有任何影响（我不这么认为，但我只是想确定）？
2）还有一个更普遍的问题：为什么不应该以这种方式进行校准校正？
谢谢，我感谢任何人对此有任何意见。
如果有什么我想念或应该知道的，请告诉我。编辑：Cheenu于2014年1月7日下午3:36



     以下为原文

  Currently, we do a THRU-only calibration and then execute a sweep with correction on to measure S21 over a given span.  We were wondering if it would be possible to somehow do the calibration correction afterwards, and if so, how to calculate the interpolated calibration coefficients.

1)     The center and span of the measurement sweep will differ from the center and span of the calibration sweep, and the measurement sweep is done with fewer points.  How is the calibration interpolation done in cases like these?  Is it simply the case that one linearly extrapolates between known values of Ett?

For example, if we know the Real and Imaginary values of Ett at 10.1MHz are 0.96 and 0.11 and the Real and Imaginary values of Ett at 10.2MHz are 0.97 and 0.10, would we simply calculate the Real and Imaginary values of Ett at 10.13MHz to be 0.963 and 0.107?  Or are the interpolated calibration coefficients calculated in some other manner?  Additionally, does a change in the IFBW value between the calibration sweep and the measurement sweep have any effect (I wouldn’t think so, but I just wanted to be sure)?

2)     And one more general question:  are there any reasons why the calibration correction should not be done in this manner?

Thanks, and I appreciate any input any of you would have about this.  If there’s anything I’m missing or should be aware of, please let me know.

Edited by: Cheenu on Jan 7, 2014 3:36 PM