Accounting of Errors of the Coordinates of Elements and Parameters of Antenna Systems for Determining Directions of Sources of Radio Emission
Authors: Greshilov A.A., Skobelev M.M. | Published: 17.08.2013 |
Published in issue: #2(91)/2013 | |
DOI: | |
Category: Radio Electronics | |
Keywords: bearing, antenna systems, confluent analysis, iterative process, inverse |
The technical result is obtained which consists in accuracy improvement of direction-finding when receiving radiosignals from several radio sources of the same frequency with the use of the antenna system (AS) comprising poorly directed elements (dipoles). Improving the direction-finding accuracy is achieved through the use of algorithmfor identification of AS parameters entering the formulas for bearing calculation using algorithms of confluent analysis. The logarithmic likelihood function is formed which includes all parameters entering the formula for bearing calculation. For the special case that is important in practice when the errors Si и £i are not correlated, the functional, whose point of minimum is the desired solution, has the formThe first equation provides determination ofbearing values with the measured values of the variables Di included in the calculation, the second equation makes it possible to choose the most probable value £i £ Di that will be involved in the next iteration of the bearing calculation. Bearing values are calculated by means of the iterative process, by specifying values of the elements £ of antenna system and the signal y of amplitude phase distribution, entering the bearing definition. To obtain interval estimates of the bearing values, the correlation matrix of errors of bearing values is calculated as the inverse matrix of second derivatives of the functional F with the found bearing values.
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