The Fletcher penalty method [8] was used for finding the coefficients yn. The penalty function in this case has the form: If the minimum value of the penalty function had less than the given accuracy e, a conclusion was drawn that the values of the coefficients obtained satisfy eq.(14)-(15). It is also important to note that the penalty function (16) only depends on the following parameters: Thus, one need use only these parameters in calculations. It is clear that there is a minimum distance between the antennas - Dmin for each set of parameters z„ and r0. When D < Dmin it is not possible to find appropriate coefficients yn. The following algorithm for finding Dmin was used. It is necessary to decrease the distance between antennas step by step and try to find coefficients yn which minimize the penalty function (16) to less than the given accuracy. The penalty function can’t be minimized for distances less than Dmin: The following values of the parameters were used: e=10'5 and 3=0.05. The coefficients ynm were used as a starting point for searching y„(m+1).
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