Specific Features Pertinent to the Use of Planar Antenna Arrays with Central Symmetry in Interference Cancellers
Abstract
Matters concerned with analyzing the performance of an interference canceler equipped with a specially configured antenna array (AA) are discussed. As is known, the performance of an adaptive system depends directly on the characteristics and arrangement of antenna array elements. It is shown that the use of planar centrally symmetric AAs in the interference canceler scheme entails an essential drawback pertinent to operation of the adaptive system as a whole. Namely, there are some cases of interference arrival directions (jamming environment) in which the canceler fails to suppress the active interference. With such environment, the jams are statistically independent, act from different directions, and their number is by one fewer than the number of AA elements. This is due to the fact that for the considered jamming environment cases the rank of the jammer subspace is less than the number of acting jammers. As a result, an attempt to set up the array pattern zeroes in the directions of all jams is not met with success. The problem of searching jamming environments for which the above-mentioned drawback takes place is analyzed. The special jam action directions for which the interference canceler shows poor performance are calculated taking a four-element planar AA as an example. The obtained theoretical results are confirmed by simulating the interference canceler operation. The constructed interference canceler model does not contain the destabilizing factors available in real hardware, a circumstance that opens the possibility to estimate the effect of jamming environment as the only influencing factor. The simulation results make it possible to estimate the canceler performance in unfavorable jamming environment. For the considered case, the suppression ratio has been reduced up to 2.7 dB with the interference-to-noise ratio equal to 60 dB at the canceler input, as a result of which the acting jams pass to the canceler output almost without having been suppressed at all. The interference canceler performance both in favorable and unfavorable environments is clearly shown by an antenna pattern. To overcome the considered drawback, it is recommended to alter the AA geometry and use a redundant number of antenna elements and other receiving system anti-jam algorithms.
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Для цитирования: Грибов П.С., Грибова М.А., Шатилов А.Ю. Особенность использования планарных антенных решеток с центральной симметрией в схеме компенсатора помех // Вестник МЭИ. 2018. № 2. С. 123—128. DOI: 10.24160/1993-6982-2018-2-123-128.
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For citation: Gribov P.S., Gribova М.А., Shatilov А.Yu. Specific Features Pertinent to the Use of Planar Antenna Arrays with Central Symmetry in Interference Cancellers. MPEI Vestnik. 2018;2:123—128. (in Russian). DOI: 10.24160/1993-6982-2018-2-123-128.
