Analysis of multi-probe measuring line model and calculation of uncertainty of measurement with its help

The article considers the uncertainty method and its use in modern measuring systems in microwaves. The advantages of the method are described, they demonstrate the effectiveness of the uncertainty method in estimating errors that occur during operation and calibration of a multi-probe transmission line reflectometer (MTLR) which can be used as a receiver in software-defined radio communication systems. The equations are obtained for the measurement uncertainties of MTLR due to various sources: errors in measuring voltages at the outputs of detectors, errors in calibration, inaccuracies in the knowledge of the wavelength in the line, and distances from the test load to the sensors. To analyze the uncertainties of types A and B, a numerical simulation of measuring the estimated parameters was carried out. Based on the data obtained, the results show that the expressions for dispersion matrices fully describe the nature of the measurement uncertainty in the ranges of variances of different error sources. The results of computer simulation confirming the theoretical conclusions are presented.