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Дата издания
30.10.2023На каком языке издана
ISSN
1729-3774Область исследования
Тип исследования
Аннотация (краткое описание)
A method of correlation-interferometric direction finding has been improved, which effectively solves the problem of radio direction finding of radio emission sources under conditions of exposure to one or two masking interference. The problem was solved using the selection of an unmasked fragment of the spatial spectrum of the signal and the reconstruction of the missing samples of its signal group. As a result of the synthesis of the proposed method, estimates of signal samples were obtained as exact solutions to the proposed energy balance equations. The resulting solutions provide a significant increase in the signal-to-interference ratio and, accordingly, direction-finding accuracy without increasing the number of reception channels of the antenna array. As a result of the simulation, the dependences of the standard deviation of the bearing estimate on the signal-to-noise ratio in the presence of interference were built. Under the influence of one or two masking interferences and a signal-to-interference ratio of 0 dB, the use of the known direction-finding method without interference selection produces an anomalously large direction-finding error of more than 0.42 degrees, which is practically independent of the signal-to-noise ratio. The direction-finding method with selection of spectral signal samples masked by interference reduces the direction-finding error to 0.22 degrees when exposed to one interference and to 0.3 degrees when exposed to two interferences. This is due to the presence of power losses of the usable signal during the selection of its samples masked by interference. The proposed method of direction finding with reconstruction of signal samples provides a significant gain in accuracy by 3–30 times compared to the method of selection of masked samples in the range of changes in the signal-to-noise ratio (–20.5) dB. The direction-finding error of the proposed method decreases with increasing signal/noise according to a hyperbolic dependence. It is advisable to use the proposed direction-finding method when masking no more than two samples of the signal group © 2023, Authors. This is an open access article under the Creative Commons CC BY licenseDOI
DOI: 10.15587/1729-4061.2023.288397Тип публикаций
Практическое значение
1. A high-speed digital spectral method of correlation-in-terferometric direction finding with reconstruction of a spatial analytical signal has been developed for conditions of processing an incomplete spatial spectrum of a signal under the influence of one or two masking noises. This is achieved by using the reconstruction of signal samples masked by noise. Analytical relations for estimating reconstructed signal samples at the output of the array were obtained. This ensures effective direction finding of RES using various types of weighting function W(z) for synthesizing a multi-lobe radiation pattern, taking into account the power of masked interference. A combination of reconstruction of signal samples with subsequent single-iteration estimation of the direction to RES is proposed, which ensures high accuracy and speed of the developed direction-finding method at a signal-to-interference ratio (–20dB) without increasing the size of AA and the number of its receiving channels.2. An analytical assessment of the noise immunity of the proposed method was carried out under conditions of exposure to powerful masking interference. Relationships for absolute and relative estimates of noise immunity were obtained. It is shown that the gain in noise immunity of the method with reconstruction compared to the known method without sample selection is more than 32 dB. The research results showed the effectiveness of the proposed method in complex EME.3.Modeling of direction-finding algorithms was car-ried out using methods with reconstruction and selection of samples masked by interference. The dependence of the direction-finding error on the signal-to-noise ratio was studied at a signal-to-noise ratio of 0 dB. The use of methods with and without selection of samples produces an anomalously large direction-finding error of 0.42 de-grees and 0.23 degrees, respectively. The method with re-construction of readings provides an error of (0.02–0.06) degrees. The dependence of the direction finding of the proposed method on the signal-to-noise ratio was also studied. It is shown that the method with reconstruc-tion of samples provides a significant gain in accuracy by 4–8 times compared to the selection method in the signal/interference range (–20; 10) dB. The simulation results confirmed the effectiveness of the method for reconstructing signal samples masked by interference and are consistent with the results of analytical studiesКвартиль
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0Количество цитирований
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288397-Article Text-669781-1-10-20231031.pdf