Особливості просторової обробки сигналів у широкосмуговій системі пасивної радіолокації

Sergey Zibin; Andrey Popov; Tverdochlibov Volodimir

doi:10.34169/2414-0651.2020.1(25).52-59

FEATURES OF SPATIAL SIGNAL PROCESSING IN A WIDEBAND PASSIVE RADAR SYSTEM

Authors

Sergey Zibin Central Scientific Research Institute of Armament and Military Equipment of Armed Forces of Ukraine
Andrey Popov Central Scientific Research Institute of Armament and Military Equipment of Armed Forces of Ukraine
Tverdochlibov Volodimir Central Scientific Research Institute of Armament and Military Equipment of Armed Forces of Ukraine

DOI:

https://doi.org/10.34169/2414-0651.2020.1(25).52-59

Keywords:

signal intelligence system, radiofrequency monitoring system, radiofrequency emission source, wideband circular antenna array, spatial filtering of the signals, angle of signal arrival estimation, linear constraint minimum variance method, multiple signal classification method

Abstract

We substantiate the necessity of upgrading methods and algorithms used when developing perspective signal intelligence (SIGINT) and/or radiofrequency (RF) monitoring systems. We show this problem is caused by increasing the requirements with respect to capabilities of SIGINT and/or RF monitoring systems which, being wideband systems, operate under complicated interference conditions. These requirements touch on capabilities concerning extracting and detecting the signals in interference background, also capabilities regarding estimating the angles of arrival of RF emission sources (RFES) and resolving the signals over angular coordinate.

We formulate the problem of signal spatial filtering with the use of linear constraint minimum variance (LCMV) method for the purpose of slow direction searching RFES by SIGINT and/or RF monitoring system. We show this problem can be solved by the suggested signal processing algorithm based on wideband circular antenna array. We consider example of implementation of the suggested spatial filtering algorithm operating under strong interference conditions on the basis of wideband circular antenna array. We show that exploiting 19 elements wideband circular antenna array one can provide interference suppression coefficient up to 40 dB so that useful narrowband signal is extracted with satisfactory quality.

We formulate the problem of estimating angle of arrival (AoA) of the signals from a set of RFES using multiple signal classification (MUSIC) method for the purpose of fast RFES direction search under low and intermediate intensity interference conditions. We consider variant of this problem solution on the basis of the suggested signal processing algorithm which provides eliminating injurious influence of dispersion phenomena taking place in wideband circular antenna array. We show an example of implementing the suggested algorithm of estimating AoA of the signals from a set of RFES using MUSIC method exploiting wideband circular antenna array. We draw a conclusion that the obtained results provide the opportunity of forming the corresponding requirements when developing SIGINT and/ or RF monitoring systems.

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Author Biographies

Andrey Popov , Central Scientific Research Institute of Armament and Military Equipment of Armed Forces of Ukraine

Candidate of Technical Science

Tverdochlibov Volodimir , Central Scientific Research Institute of Armament and Military Equipment of Armed Forces of Ukraine

Candidate of Technical Science

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