The method for the rational formation of weighting coefficients in the processing channels of a broadband adaptive antenna array

Аuthors

Novikov A. N.

Military Academy of Strategic Rocket Troops named after Peter the Great, SRTMA, 8, Karbysheva str., Balashikha, Moscow region, 143900, Russia

e-mail: band31@mail.ru

Abstract

Fighter aviation plays an important role in ensuring security and sovereignty of the Russian Federation. Modern Russian fighter aircraft are equipped with the onboard radio-technical complexes, on which the success of the assigned missions accomplishing largely depends. One of the main elements of any radio engineering complex is antenna, to which a number of requirements for primary signal processing is placed. Adaptive antenna arrys relate to the antennas allowing signal processing performing. The theory of adaptive antenna arrays has currently developed only for the narrowband, and more precisely for the harmonic signals. However, modern realities dictate the need to employ signals with a wider spectrum, which makes the theory of adaptive antenna arrays ineffective for such signals. Nevertheless, the developed theory of harmonic signal processing became the basis for the development of the theory of broadband signal processing in adaptive antenna arrays. The frequency representation of the signal, but not the time representation, is taken herewith as a basis. Analytical relations to form optimal weighting coefficients in the frequency-dependent processing channels of the adaptive antenna array were revealed. Implementation of the optimal weighting coefficients is impossible in practice due to the continuity and infinity of the broadband signal spectrum. However, the optimal representation allowed formulating an approach to finding quasi-optimal weighting coefficients, which essence consists in finding the optimal vector of weighting coefficients at certain frequencies of the spectrum of a useful broadband signal and its interpolation at other frequencies of the spectrum of a useful broadband signal by various interpolation polynomials. The frequencies herwith, at which the vector of weighting coefficients was optimally determined, were selected arbitrarily with the same discrete interval without accounting for the spectral structure of the useful broadband signal. However, the analysis demonstrated that at the frequencies, at which the spectral density of the useful signal is low, the interference signal is most effective and vice versa. In this regard, a method that accountы ащк the spectral density of the useful signal when forming quasi-optimal weighting coefficients has been developed. This method allows to distributing rationally optimal weighting coefficients over the spectrum of a useful broadband signal and adapting to the interference signals more efficiently.

Keywords:

antenna array, vector of weighting coefficients, broadband signal, spectral density, interpolation

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