Victor Golikov - Academia.edu (original) (raw)
Papers by Victor Golikov
We investigated the robustness of the linear detector operating in a Gaussian environment in the ... more We investigated the robustness of the linear detector operating in a Gaussian environment in the presence of a mismatch between the design interference covariance matrix and the actual one. We have suggested that the Gaussian environment consists of a known colored clutter, a white noise and a strong unwanted periodical signal with unknown nonstationary power. It has been obtained the
Radioelectronics and Communications Systems, 2004
The paper is devoted to investigation of detection of determinate signals with a fixed false alar... more The paper is devoted to investigation of detection of determinate signals with a fixed false alarm probability in the case of unknown matrix of interference covariances, when the detection is based on the Neumann-Pearson criterion. The conditions are deduced for the detector ensuring a constant false alarm probability when the unknown matrix of interference covariances has the Toeplitz structure. The efficiency of this detector is assessed by the simulation method. It is shown that there may exist an acceptable loss with respect to the Neumann-Pearson optimal detector.
Journal of Advanced Research in Dynamical and Control Systems, May 30, 2020
Machines, May 16, 2022
This article is an open access article distributed under the terms and conditions of the Creative... more This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY
Energies, Nov 9, 2022
This article is an open access article distributed under the terms and conditions of the Creative... more This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY
Revista del diseño innovativo, Dec 31, 2022
We design and assess an algorithm to detect a multi-pixel target of an unknown spatial size, shap... more We design and assess an algorithm to detect a multi-pixel target of an unknown spatial size, shape and position in a sequence of images in the presence of an additive Gaussian background clutter and a channel noise. The presence of the target decreases the background plus noise power that hence may be different under the null and alternative hypotheses. We use the generalized likelihood ratio (GLR) approach to derive a modified multi-pixel matched subspace detector (MMMSD) that is sensitive to both energy in the target subspace and reduced energy in the orthogonal subspace. The derived algorithm combines the multi-pixel matched subspace detector and multi-pixel background-plus-noise power change detector in a unique scheme. The crucial characteristic of the proposed detector is that prior knowledge of the target size, shape and position is not required. The designed detector is theoretically proved and numerically evaluated. Numerical simulations attest the validity of the theoretic...
2019 IEEE International Autumn Meeting on Power, Electronics and Computing (ROPEC)
Different types of detectors have been evaluated to find targets on the sea surface by using reco... more Different types of detectors have been evaluated to find targets on the sea surface by using recorded videos from a fixed camera placed on the beach, but not with mobile cameras, therefore, in this work recorded videos from a quadrotor are analyzed in order to monitor and detect barely discernible objects on the surface of the sea. The Adaptive Subspace Detector (ASD) and the Modified Adaptive Subspace Detector (MASD) based on the Generalized Likelihood Ratio Test (GLRT) are implemented and compared by video processing varying parameters such as the size of the analysis window, the number of harmonics and processed images. The numerical and experimental tests allow to make recommendations on which detector to use under certain conditions.
Machines
In this paper, a complementary and simplified scheme to diagnose electrical faults in a three-pha... more In this paper, a complementary and simplified scheme to diagnose electrical faults in a three-phase induction motor using the parity equations approach during steady state operation bases on the stator current reference frame is presented. The proposed scheme allows us to identify the motor phase affected due to faults related to the stator side, such as current sensors, voltage sensors, and resistance. The results obtained in this work complement a detection system that uses the DQ model of the three-phase induction motor and parity equations focused on the synchronous reference frame, which can detect stator-side faults but cannot locate the affected phase. In addition, considering practical and operational aspects, the residual detection set obtained is simplified to three simple algebraic equations that are easy to implement. The simulation results using the PSIM simulation software and the experimental test allow us to validate the proposed scheme.
2021 18th International Conference on Electrical Engineering, Computing Science and Automatic Control (CCE)
Much interest has arisen in the problem of automatic video detection of small low contrast floati... more Much interest has arisen in the problem of automatic video detection of small low contrast floating objects on a sea surface. The Modified Matched Subspace Detector (MMSD) has been recently proposed for detecting a barely discernible object in an agitated sea surface. MMSD uses the intensity difference between the sea and the object at relatively high frequencies. In the literature the performances of this detector has been evaluated using only a sea model (additive Gaussian background clutter). In this paper we realize a comparison between classical Matched Subspace Detector (MSD) and MMSD using real sea images with synthetic model of the reflections from floating objects. This paper investigates the comparative MSD and MMSD performance, provided that the energy reflected from the object is equal to the energy reflected from the sea. The paper considers the dependence of the detection probability with a fixed probability of false alarm on the difference between the average of reflections from the sea surface and from a floating object at the different MMSD parameters and standard deviations of reflections from the object and the sea surface.
The video images captured at long range usually have low contrast floating objects of interest on... more The video images captured at long range usually have low contrast floating objects of interest on a sea surface. A comparative experimental study of the statistical characteristics of reflections from floating objects and from the agitated sea surface showed the difference in the correlation and spectral characteristics of these reflections. The functioning of the recently proposed modified matched subspace detector (MMSD) is based on the separation of the observed data spectrum on two subspaces: relatively low and relatively high frequencies. In the literature the MMSD performance has been evaluated in generally and moreover using only a sea model (additive Gaussian background clutter). This paper extends the performance evaluating methodology for low contrast object detection and moreover using only the real sea dataset. This methodology assumes an object of low contrast if the mean and variance of the object and the surrounding background are the same. The paper assumes that the ...
Computacion y Sistemas
In this paper, matched detector (MD) and matched subspace detector (MSD) are studied when the str... more In this paper, matched detector (MD) and matched subspace detector (MSD) are studied when the structured background power is different under the null and the alternative hypotheses. The distributions of two test statistics are derived under these conditions. It has been analytically shown that these detectors can suffer a drastic degradation in performance for background power deviations under alternative hypothesis. We discuss the differences between the performances of these detectors in the case of the structured and unstructured backgrounds with uncorrelated Gaussian noise. The theoretical results are compared with simulated data and good agreement is reported. We present experimental results of small floating object detection on an agitated sea surface using spectral digital video experiments which validate the theoretical results.
International Journal of Nonlinear Analysis and Applications, 2021
The work is devoted to the characteristic properties analysis of the sea surface image on video s... more The work is devoted to the characteristic properties analysis of the sea surface image on video stream frames, which make it possible to make a decision about the detection of object images on them in the absence of a priori information about objects, which is important in the development of navigation systems, security and surveillance systems. In this paper, it is proposed to analyze the values of the normalized cross-correlation coefficients of a given image fragment with higher dimension fragments on sequential video stream frames to identify the distinctive properties of agitated sea surface and floating objects images. The computational experiments were carried out and have shown that the analysis of the results of calculating the frame fragments cross-correlations allows us to estimate the amount of displacement and distortion of a given image fragment. The results of computational experiments demonstrate the presence of differences in the values of the corresponding cross-co...
2014 11th International Conference on Electrical Engineering, Computing Science and Automatic Control (CCE), 2014
Proceedings of the 1st International Conference on Pattern Recognition Applications and Methods, 2012
We consider the problem of detecting and recognizing the subpixel targets in sea background when ... more We consider the problem of detecting and recognizing the subpixel targets in sea background when the background power may be different under the null hypothesis-where it is assumed to be known-and the alternative multiple hypotheses. This situation occurs when the presence of the target triggers a decrease in the background power (subpixel targets). We extend the formulation of the Matched Subspace Detector (MSD) to the case where the background power is only known under the null hypothesis using the generalized likelihood ratio test (GLRT) for the multiple hypotheses case. The obtained multiple hypotheses test is based on the Modified MSD test (MMSD). We discuss the difference between the two detection and recognition systems: based on the MSD and MMSD tests. Numerical simulations attest to the validity of the performance analysis.
Mathematics, 2022
Video images captured at long range often show low-contrast floating objects of interest on a sea... more Video images captured at long range often show low-contrast floating objects of interest on a sea surface. A comparative experimental study of the statistical characteristics of reflections from floating objects and from the agitated sea surface showed differences in the correlation and spectral characteristics of these reflections. The functioning of the recently proposed modified matched subspace detector (MMSD) is based on the separation of the observed data spectrum on two subspaces: relatively low and relatively high frequencies. In the literature, the MMSD performance has been evaluated in general and using only a sea model (i.e., additive Gaussian background clutter). This paper extends the performance evaluating methodology for low contrast object detection using only a real sea dataset. The methodology assumes an object of low contrast if the mean and variance of the object and the surrounding background are the same. The paper assumes that the energy spectrum of the object...
Computación y Sistemas, 2013
Conference Proceedings of the Society for Experimental Mechanics Series, 2016
This paper reports the construction of an experimental setup to attenuate the ASE (Amplified Spon... more This paper reports the construction of an experimental setup to attenuate the ASE (Amplified Spontaneous Emission) noise around 1548.4 nm. A Sagnac Interferometer (SI) which uses high-birefringence fiber (Hi-Bi fiber) at 8, 22 and 110 cm is used as band pass filter for attenuating the ASE noise. Temperature variations are made to tune in the filter SI. A test signal containing noise ASE is taken from an erbium-doped optical fiber and a fiber Bragg grating (FBG), therefore the 1548.4 nm signal surrounded for ASE is obtained. This test signal is introduced into the SI filter and the transmitted power of the interferometer is measured, the transmitted signal of SI has periodic variations with maximums and minimums, the SI is tuned in with temperature to bring the maximum transmitted power at the same wavelength of the signal 1548.4 nm. We found experimentally that is possible to attenuate the ASE noise contribution around 1548.4 nm by comparing the input test signal versus the output signal at the output port of SI. In addition, we found the displacement of the transmittance with respect to temperature (Δλ/ΔT) and the period of the transmitted power (Δλ).
The problem of matched-filter detection of three dimensional moving target has been considered. B... more The problem of matched-filter detection of three dimensional moving target has been considered. Both the signal and background clutter are assumed to be Gaussian processes. The proposed quasi-optimal matched filter is derived based on a weak signal model and unknown ratio of intensity of no-fluctuating background to fluctuating background. Mathematical equations for the computation of the quasioptimal matched filter and its received characteristics have been derived. We have shown that the proposed detector exhibits performance, which is clearly superior to that of the well-known detector in case of presence of an intensive nofluctuating background.
Nuclear Instruments and …, 2007
In the framework of the European program aimed at the developing of a second generation radioacti... more In the framework of the European program aimed at the developing of a second generation radioactive ion beam (RIB) facility, the Legnaro National Laboratories (LNL) propose in the next few years the construction of a specialized national facility for RIB originated by fission fragments ...
We investigated the robustness of the linear detector operating in a Gaussian environment in the ... more We investigated the robustness of the linear detector operating in a Gaussian environment in the presence of a mismatch between the design interference covariance matrix and the actual one. We have suggested that the Gaussian environment consists of a known colored clutter, a white noise and a strong unwanted periodical signal with unknown nonstationary power. It has been obtained the
Radioelectronics and Communications Systems, 2004
The paper is devoted to investigation of detection of determinate signals with a fixed false alar... more The paper is devoted to investigation of detection of determinate signals with a fixed false alarm probability in the case of unknown matrix of interference covariances, when the detection is based on the Neumann-Pearson criterion. The conditions are deduced for the detector ensuring a constant false alarm probability when the unknown matrix of interference covariances has the Toeplitz structure. The efficiency of this detector is assessed by the simulation method. It is shown that there may exist an acceptable loss with respect to the Neumann-Pearson optimal detector.
Journal of Advanced Research in Dynamical and Control Systems, May 30, 2020
Machines, May 16, 2022
This article is an open access article distributed under the terms and conditions of the Creative... more This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY
Energies, Nov 9, 2022
This article is an open access article distributed under the terms and conditions of the Creative... more This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY
Revista del diseño innovativo, Dec 31, 2022
We design and assess an algorithm to detect a multi-pixel target of an unknown spatial size, shap... more We design and assess an algorithm to detect a multi-pixel target of an unknown spatial size, shape and position in a sequence of images in the presence of an additive Gaussian background clutter and a channel noise. The presence of the target decreases the background plus noise power that hence may be different under the null and alternative hypotheses. We use the generalized likelihood ratio (GLR) approach to derive a modified multi-pixel matched subspace detector (MMMSD) that is sensitive to both energy in the target subspace and reduced energy in the orthogonal subspace. The derived algorithm combines the multi-pixel matched subspace detector and multi-pixel background-plus-noise power change detector in a unique scheme. The crucial characteristic of the proposed detector is that prior knowledge of the target size, shape and position is not required. The designed detector is theoretically proved and numerically evaluated. Numerical simulations attest the validity of the theoretic...
2019 IEEE International Autumn Meeting on Power, Electronics and Computing (ROPEC)
Different types of detectors have been evaluated to find targets on the sea surface by using reco... more Different types of detectors have been evaluated to find targets on the sea surface by using recorded videos from a fixed camera placed on the beach, but not with mobile cameras, therefore, in this work recorded videos from a quadrotor are analyzed in order to monitor and detect barely discernible objects on the surface of the sea. The Adaptive Subspace Detector (ASD) and the Modified Adaptive Subspace Detector (MASD) based on the Generalized Likelihood Ratio Test (GLRT) are implemented and compared by video processing varying parameters such as the size of the analysis window, the number of harmonics and processed images. The numerical and experimental tests allow to make recommendations on which detector to use under certain conditions.
Machines
In this paper, a complementary and simplified scheme to diagnose electrical faults in a three-pha... more In this paper, a complementary and simplified scheme to diagnose electrical faults in a three-phase induction motor using the parity equations approach during steady state operation bases on the stator current reference frame is presented. The proposed scheme allows us to identify the motor phase affected due to faults related to the stator side, such as current sensors, voltage sensors, and resistance. The results obtained in this work complement a detection system that uses the DQ model of the three-phase induction motor and parity equations focused on the synchronous reference frame, which can detect stator-side faults but cannot locate the affected phase. In addition, considering practical and operational aspects, the residual detection set obtained is simplified to three simple algebraic equations that are easy to implement. The simulation results using the PSIM simulation software and the experimental test allow us to validate the proposed scheme.
2021 18th International Conference on Electrical Engineering, Computing Science and Automatic Control (CCE)
Much interest has arisen in the problem of automatic video detection of small low contrast floati... more Much interest has arisen in the problem of automatic video detection of small low contrast floating objects on a sea surface. The Modified Matched Subspace Detector (MMSD) has been recently proposed for detecting a barely discernible object in an agitated sea surface. MMSD uses the intensity difference between the sea and the object at relatively high frequencies. In the literature the performances of this detector has been evaluated using only a sea model (additive Gaussian background clutter). In this paper we realize a comparison between classical Matched Subspace Detector (MSD) and MMSD using real sea images with synthetic model of the reflections from floating objects. This paper investigates the comparative MSD and MMSD performance, provided that the energy reflected from the object is equal to the energy reflected from the sea. The paper considers the dependence of the detection probability with a fixed probability of false alarm on the difference between the average of reflections from the sea surface and from a floating object at the different MMSD parameters and standard deviations of reflections from the object and the sea surface.
The video images captured at long range usually have low contrast floating objects of interest on... more The video images captured at long range usually have low contrast floating objects of interest on a sea surface. A comparative experimental study of the statistical characteristics of reflections from floating objects and from the agitated sea surface showed the difference in the correlation and spectral characteristics of these reflections. The functioning of the recently proposed modified matched subspace detector (MMSD) is based on the separation of the observed data spectrum on two subspaces: relatively low and relatively high frequencies. In the literature the MMSD performance has been evaluated in generally and moreover using only a sea model (additive Gaussian background clutter). This paper extends the performance evaluating methodology for low contrast object detection and moreover using only the real sea dataset. This methodology assumes an object of low contrast if the mean and variance of the object and the surrounding background are the same. The paper assumes that the ...
Computacion y Sistemas
In this paper, matched detector (MD) and matched subspace detector (MSD) are studied when the str... more In this paper, matched detector (MD) and matched subspace detector (MSD) are studied when the structured background power is different under the null and the alternative hypotheses. The distributions of two test statistics are derived under these conditions. It has been analytically shown that these detectors can suffer a drastic degradation in performance for background power deviations under alternative hypothesis. We discuss the differences between the performances of these detectors in the case of the structured and unstructured backgrounds with uncorrelated Gaussian noise. The theoretical results are compared with simulated data and good agreement is reported. We present experimental results of small floating object detection on an agitated sea surface using spectral digital video experiments which validate the theoretical results.
International Journal of Nonlinear Analysis and Applications, 2021
The work is devoted to the characteristic properties analysis of the sea surface image on video s... more The work is devoted to the characteristic properties analysis of the sea surface image on video stream frames, which make it possible to make a decision about the detection of object images on them in the absence of a priori information about objects, which is important in the development of navigation systems, security and surveillance systems. In this paper, it is proposed to analyze the values of the normalized cross-correlation coefficients of a given image fragment with higher dimension fragments on sequential video stream frames to identify the distinctive properties of agitated sea surface and floating objects images. The computational experiments were carried out and have shown that the analysis of the results of calculating the frame fragments cross-correlations allows us to estimate the amount of displacement and distortion of a given image fragment. The results of computational experiments demonstrate the presence of differences in the values of the corresponding cross-co...
2014 11th International Conference on Electrical Engineering, Computing Science and Automatic Control (CCE), 2014
Proceedings of the 1st International Conference on Pattern Recognition Applications and Methods, 2012
We consider the problem of detecting and recognizing the subpixel targets in sea background when ... more We consider the problem of detecting and recognizing the subpixel targets in sea background when the background power may be different under the null hypothesis-where it is assumed to be known-and the alternative multiple hypotheses. This situation occurs when the presence of the target triggers a decrease in the background power (subpixel targets). We extend the formulation of the Matched Subspace Detector (MSD) to the case where the background power is only known under the null hypothesis using the generalized likelihood ratio test (GLRT) for the multiple hypotheses case. The obtained multiple hypotheses test is based on the Modified MSD test (MMSD). We discuss the difference between the two detection and recognition systems: based on the MSD and MMSD tests. Numerical simulations attest to the validity of the performance analysis.
Mathematics, 2022
Video images captured at long range often show low-contrast floating objects of interest on a sea... more Video images captured at long range often show low-contrast floating objects of interest on a sea surface. A comparative experimental study of the statistical characteristics of reflections from floating objects and from the agitated sea surface showed differences in the correlation and spectral characteristics of these reflections. The functioning of the recently proposed modified matched subspace detector (MMSD) is based on the separation of the observed data spectrum on two subspaces: relatively low and relatively high frequencies. In the literature, the MMSD performance has been evaluated in general and using only a sea model (i.e., additive Gaussian background clutter). This paper extends the performance evaluating methodology for low contrast object detection using only a real sea dataset. The methodology assumes an object of low contrast if the mean and variance of the object and the surrounding background are the same. The paper assumes that the energy spectrum of the object...
Computación y Sistemas, 2013
Conference Proceedings of the Society for Experimental Mechanics Series, 2016
This paper reports the construction of an experimental setup to attenuate the ASE (Amplified Spon... more This paper reports the construction of an experimental setup to attenuate the ASE (Amplified Spontaneous Emission) noise around 1548.4 nm. A Sagnac Interferometer (SI) which uses high-birefringence fiber (Hi-Bi fiber) at 8, 22 and 110 cm is used as band pass filter for attenuating the ASE noise. Temperature variations are made to tune in the filter SI. A test signal containing noise ASE is taken from an erbium-doped optical fiber and a fiber Bragg grating (FBG), therefore the 1548.4 nm signal surrounded for ASE is obtained. This test signal is introduced into the SI filter and the transmitted power of the interferometer is measured, the transmitted signal of SI has periodic variations with maximums and minimums, the SI is tuned in with temperature to bring the maximum transmitted power at the same wavelength of the signal 1548.4 nm. We found experimentally that is possible to attenuate the ASE noise contribution around 1548.4 nm by comparing the input test signal versus the output signal at the output port of SI. In addition, we found the displacement of the transmittance with respect to temperature (Δλ/ΔT) and the period of the transmitted power (Δλ).
The problem of matched-filter detection of three dimensional moving target has been considered. B... more The problem of matched-filter detection of three dimensional moving target has been considered. Both the signal and background clutter are assumed to be Gaussian processes. The proposed quasi-optimal matched filter is derived based on a weak signal model and unknown ratio of intensity of no-fluctuating background to fluctuating background. Mathematical equations for the computation of the quasioptimal matched filter and its received characteristics have been derived. We have shown that the proposed detector exhibits performance, which is clearly superior to that of the well-known detector in case of presence of an intensive nofluctuating background.
Nuclear Instruments and …, 2007
In the framework of the European program aimed at the developing of a second generation radioacti... more In the framework of the European program aimed at the developing of a second generation radioactive ion beam (RIB) facility, the Legnaro National Laboratories (LNL) propose in the next few years the construction of a specialized national facility for RIB originated by fission fragments ...