Математическая модель измерительного комплекса для определения внешних параметров вибраторных активных фазированных антенных решеток в ближней зоне.

Abstract

When measuring characteristics of the modern multi-element active phased antenna arrays amplifications method may have problems processing the results of measurements, due to the complexity of the exact adjustment of the overall active phased array, the fluctuations of the parameters of microwave amplifiers, the failure of individual elements, the inadmissibility of the full radiation of aperture antennas in an anechoic chamber. Electrodynamic modeling of active phased array antennas in specialized programs usually requires very large computational costs and it is very difficult to take into account fluctuations in parameters and failures of active phased array elements. In this regard, a mathematical model of the measuring complex is proposed for estimating the field distribution in the near zone of vibratory antenna arrays and generating radiation patterns. The estimation methodology is based on direct measurements of the amplitude-phase distribution of the field of the antenna system on the selected surface in the immediate vicinity of its aperture using a sounding antenna. The main relations for the model are the well-known expressions for calculating the field distribution in the near zone of a vertical symmetrical vibrator, the method of induced electromotive force, and matrix relations for converting the field into various coordinate systems. The model of the measuring complex is used to evaluate the characteristics of the active phased array in the near and far zones. However, it can be used to check real experimental data, taking into account fluctuations in the parameters of the amplitude-phase distribution in the aperture, and failures of antenna elements. The conducted research has shown a good agreement between the calculated characteristics of the active phased array using the proposed model and the aperture method. The time for calculating the antenna directivity characteristics in the proposed model is 30 minutes. The main time is associated with the addition of resistance matrices with elements related to each new position of the probe antenna. However, this time is not comparable to the time required to implement the measurement model in specialized electrodynamic modeling packages.