频域信道测量中VNA测量不确定度传播规律

针对频域信道测量中测量仪器引入的不确定度进行了深入分析。矢量网络分析仪是频域信道测量中最重要的测量仪器,测量前必须进行自校准。深入分析不同校准方法所引入的测量不确定度是合理选择自校方法的量化依据。测量不确定度分析基于蒙特卡洛法。由于在频域信道测量中需要对多个频点进行测量,而各频点间的测量结果存在较强的相关性,因此在应用蒙特卡洛法的基础上引入了基于协方差矩阵的分析方法,从而考虑了相关性的影响,给出了更为准确合理的不确定度分析,最终有效地指导了自校方法的合理选择。实验表明,是否考虑相关性,对信道参数的测量不确定度有较大影响。基于对测量不确定度的定量分析,可以得出直通校准是更适合于信道测量的矢网自校准方法的结论。

Measurement Uncertainty Propagation Law for VNA in Frequency Domain Channel Measurement

The measurement uncertainty is introduced by measurement instruments in frequency domain channel measurement systems.The measurement instrument,Vector Network Analyzer,need to be calibrated before measurement.The uncertainty analysis for various calibration methods is the foundation to make a judicious choice of calibration methods.The uncertainty analysis is based on Monte Carlo method.To account for the correlations between S-parameter measurements for different frequencies,covariance-matrix-based analysis is performed.The experiments in this paper show that correlations have a strong influence on the uncertainties of channel parameter measurements.Based on the quantitative analysis,the "response" calibration is suggested for channel measurements.