In order to measure the effective independent information of data for received power accurately and evaluate the stirring efficiency scientifically in reverberation chamber

we have proposed a new method based on the information entropy to quantify the correlations between different stirrer position samples

which gives a good solution to the problem that the correlation quantization result is always overestimated by the traditional approach. Moreover

we have analyzed the issue of non-uniqueness of the correlation quantization result caused by the loss of dimension information when stirrers work in the asynchronous status. With multidimensional received power matrix constructed to calculate the correlation coefficients between different stirrer positions

the information of stirrer step modes and spatial locations is completely characterized

and the correlation coefficients calculating formula for one-dimensional array is extended to multidimensional matrix simultaneously. The uniqueness of the number of independent stirrer positions when the stirrers are in asynchronous operation is ensured by constructing the correlation coefficients matrix to calculate its Frobenius norm and solve the number of the independent stirrer positions. Both the theoretical analyses and experimental verification reveal that the problem of stirrer dimension information loss and independent positions overestimation in IEC 61000-4-21 standard can be solved with the application of the method proposed above

which also contributes to the uniqueness and accuracy of the calculation and give a scientific evaluation of the stirring efficiency in reverberation chamber.