Development of a method for space-time processing of broadband signals in an adaptive antenna array

DOI: 10.34759/trd-2022-124-25

Аuthors

Dementiev A. N.^*, Klyuev D. S.^**, Novikov A. N.^***, Mezhnov A. S.^****, Peterskova Y. A., Zakharova E. V., Dementiev L. A.

MIREA — Russian Technological University (Lomonosov Institute of Fine Chemical Technologies), 78, Vernadsky prospect, Moscow, 119454, Russia

*e-mail: Dementev@mirea.ru
**e-mail: klyuevd@yandex.ru
***e-mail: band31@mail.ru
****e-mail: Mezhnov.a.s@edu.mirea.ru

Abstract

Numerous scientific articles and monographs are devoted to the theory of space-time signal processing in antenna arrays. This type of processing is possible only in directional antennas, namely in adaptive antenna arrays, since they have a multichannel structure and allow you to identify the direction of signal arrival due to the accumulation of phase delay. Adaptive antenna arrays make it possible to form «nulls» of the radiation pattern in the direction of the interference signal by adjusting the vector of weight coefficients in the processing channels. The level of development of science interprets that these channels operate at the same frequency, that is, they are harmonic, which does not allow solving the problem of processing broadband signals. In this regard, a number of nuances arise that require more detailed theoretical and practical studies. At present, the issues of processing broadband signals in adaptive antenna arrays have not been studied both theoretically and practically. There is no clear understanding of the methods for selecting and calculating the vector of weighting coefficients in the frequency band. Also, the issue of receiving signals and suppressing interference, the sources of which are in motion, was not considered. These issues are relevant, since the development of modern technologies dictates the need to expand the spectrum of the transmitted signal, which makes it possible to increase the volume of transmitted information, ensure electromagnetic compatibility in conditions of saturation of the frequency range, and also increase the resolution. The article developed a method that allows spatio-temporal processing of broadband signals with the suppression of interference of various spectra, the sources of which are in motion. This method is based on the gradient descent method, which makes it possible to form «nulls» of the antenna array radiation pattern in real time and provide the required signal/(interference+noise) ratio at the output of the antenna array, which in turn provides the required bit error probability for transmission systems. Data and accuracy of determining the parameters of the object of observation and location for radar and radio navigation systems.

Keywords:

adaptive antenna array, gradient descent method, complex weight vector, antenna system radiation pattern

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