Estimation of the radiation source angular coordinates by Root-MUSIC method with the preliminary forming of orthogonal beams under the influence of out-of-band source

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DOI: https://doi.org/10.20998/2522-9052.2020.2.16
Keywords:
orthogonal beams, beamspace, spectral decomposition of correlation matrix, spectral analysis methods, interference immunity

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Volodymyr Vasylyshyn
Ivan Kozhedub Kharkiv National Air Force University, Kharkiv
https://orcid.org/0000-0002-5461-0125
Mykola Zaremskyi
military unit A1906
https://orcid.org/0000-0003-1356-3972
Vasyl Kotsiuba
Ivan Kozhedub Kharkiv National Air Force University, Kharkiv
https://orcid.org/0000-0001-6336-8193
Oleg Chehovsky
Ivan Kozhedub Kharkiv National Air Force University, Kharkiv
https://orcid.org/0000-0002-0687-5575

Abstract

The subject of study in the article is the methods of spectral analysis in the beamspace (in the case with preliminary forming of pattern orthogonal beams). The purpose of this article is to increase the efficiency of spectral analysis (reduction of root mean square error (RMSE) of estimation of radiation source angular coordinates in the beamspace under conditions of influence of out-of-band (interfering) source. The used methods are: spectral analysis methods, digital statistical modeling methods. The following results were obtained. In order to improve the estimation accuracy of the radiation source angular coordinates by Root-MUSIC method with the preliminary forming of orthogonal beams and the influence of interference, it is proposed to shift the formed beams so that the angular coordinate of the interfering source corresponds to the null of array pattern. For the case under consideration, the expression is obtained for the polynomial of the Root-MUSIC method. The angular coordinate of the interfering source can be estimated using the Bartlett method or discrete Fourier transform (DFT). It is shown that in conditions of a small sample number and low SNR, the accuracy of the proposed approach is higher than accuracy of original beamspace Root-MUSІC. Conclusions. The high level of the side lobes of the formed orthogonal beams when using the DFT leads to the influence of the radiation source, whose angular coordinate corresponds to a sector that is not covered by the beams, on the characteristics of the spectral analysis methods. The leakage effect of DFT has a place. The influence of the source, which is an interference with respect to the useful signal sources, can be reduced by the shift of the beams formed using the DFT, so that the null of beampattern corresponds to the interfering source direction. The considered approach is also advisable to use in radio communication systems with OFDM and MIMO-OFDM, based on DFT, millimeter-wave communication systems with MIMO and MIMO-OFDM in order to increase their noise immunity.

Article Details

How to Cite
Vasylyshyn, V., Zaremskyi, M., Kotsiuba, V., & Chehovsky, O. (2020). Estimation of the radiation source angular coordinates by Root-MUSIC method with the preliminary forming of orthogonal beams under the influence of out-of-band source. Advanced Information Systems, 4(2), 110–116. https://doi.org/10.20998/2522-9052.2020.2.16
Issue
Vol. 4 No. 2 (2020): Advanced Information Systems
Section
Information systems research
Author Biographies

Volodymyr Vasylyshyn, Ivan Kozhedub Kharkiv National Air Force University, Kharkiv

Doctor of Technical Science Associate Professor, Head of department

Mykola Zaremskyi, military unit A1906

leader research assistant of control department

Vasyl Kotsiuba, Ivan Kozhedub Kharkiv National Air Force University, Kharkiv

Ph.D, Associate Professor, Associate Professor of department

Oleg Chehovsky, Ivan Kozhedub Kharkiv National Air Force University, Kharkiv

cadet

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