the article considers techniques of forming the signals with a frequency-hopping spread spectrum. The advantages of systems with FHSS during electronic warfare systems jamming are shown. A new structure of the direct ...
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ISBN:
(纸本)9781538656235;9781538656228
the article considers techniques of forming the signals with a frequency-hopping spread spectrum. The advantages of systems with FHSS during electronic warfare systems jamming are shown. A new structure of the direct digital synthesizer of frequency-modulated signals that have the high frequency tuning rate is offered.
This paper describes a blind two real signals separation method. Blind separation implies that there is no information about the signals except for received samples. This eliminates the presence of a systematic error ...
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ISBN:
(纸本)9781728106069
This paper describes a blind two real signals separation method. Blind separation implies that there is no information about the signals except for received samples. This eliminates the presence of a systematic error in determining the stirring matrix and the restoration of the original signals. As a criterion for the separation of signals in this paper, the cumulants of the second and third orders of the output signals were reduced to zero. To test the performance of the method, mixing and separation model was created, and the efficiency of the method was tested at various power levels of the intrinsic noise in the receiving channels.
Singling out the characteristic areas with typical dynamics in Lorenz system signals by means of non-harmonic spectrographic analysis, a method of representing the distributions of signal probabilities has been develo...
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ISBN:
(纸本)9781538656235;9781538656228
Singling out the characteristic areas with typical dynamics in Lorenz system signals by means of non-harmonic spectrographic analysis, a method of representing the distributions of signal probabilities has been developed. Interconnections have been established between the singled out areas of Lorenz system typical dynamics and distribution of probabilities. The minimal number of poly-Gaussian components, necessary for representing the signals with required accuracy, has been assessed.
The article proposes a device for compensation of dispersion distortions, based on the modification of the classic M-channel system of digital banks of analysis and synthesis with an ideal recovery. The modification c...
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ISBN:
(纸本)9781538656235;9781538656228
The article proposes a device for compensation of dispersion distortions, based on the modification of the classic M-channel system of digital banks of analysis and synthesis with an ideal recovery. The modification consists in adding additional compensatory delays and phase shifts in the synthesis channels, determined by the calculation method, depending on the slope of the frequency dispersion of the ionospheric channel.
the article considers methods of signal spectrum spreading, which served the basis for creating a new block diagram of the direct digital synthesizer of frequency-modulated signals. The offered structure of DDS has th...
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ISBN:
(纸本)9781538656235;9781538656228
the article considers methods of signal spectrum spreading, which served the basis for creating a new block diagram of the direct digital synthesizer of frequency-modulated signals. The offered structure of DDS has the increased operation speed and it allows forming multiple frequency frequency-modulated signals. The direct digital synthesizer is created for the synthesis of signals with frequency modulation and it can be used in radiolocation, navigation and adaptive broadband communication systems with a spread spectrum.
Modern moving objects like motor vehicle, train, ship, plane and others are equipped by large quantity of apparatus and electronic devices, that are exposed to influences of external electromagnetic fields and that ar...
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ISBN:
(纸本)9781728106069
Modern moving objects like motor vehicle, train, ship, plane and others are equipped by large quantity of apparatus and electronic devices, that are exposed to influences of external electromagnetic fields and that are existed in environment. The powerful source of electromagnetic field near earth surface and inside moving objects are lightning strokes. Its field can induce sizeable interferences in lines, circuits, devices of control and driving.
The problem of accuracy and reliability of measurement results of on-board measuring radio-electronic equipment is considered. The analysis of the accuracy of the measurement of the range by a radio frequency range st...
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ISBN:
(纸本)9781538656235;9781538656228
The problem of accuracy and reliability of measurement results of on-board measuring radio-electronic equipment is considered. The analysis of the accuracy of the measurement of the range by a radio frequency range station placed on a mobile object under the influence of interference is carried out. We show that there is a nonlinearly increasing dynamic error if the optimal filter was constructed without taking into consideration of the elements nonideality. So precision of distance measurement of mobile radio-range station depends on the interference. This example emphasizes the importance of the quality problem of components used in on-board equipment and establishing tolerances for component parameters.
The new class of modified Lorenz system based pseudorandom numbers generator, realized in Galois field was considered. Modification is based on realization of Lorenz system in Galois field and making all operations of...
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ISBN:
(纸本)9781538656235;9781538656228
The new class of modified Lorenz system based pseudorandom numbers generator, realized in Galois field was considered. Modification is based on realization of Lorenz system in Galois field and making all operations of sum and multiplying in these fields. Perfection and depreciation of digital element base does actual realization of shapers of multilevel chaotic signals on the basis of algorithms of the numerical decision of systems of the differential equations describing systems with dynamic chaos. In article the analysis of statistical characteristics of a new class of pseudorandom numbers generator is carried out. Base statistical properties of modified Lorenz system based pseudorandom numbers generator, realized in Galois field were estimated. Correlation intervals of signals were estimated. Probability distributions of the generated numbers are considered.
In the modern world, image transmission, including transmission of television and video signals, is carried out using a preliminary and restorative correction according to the law, which was due to the use of imaging ...
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ISBN:
(纸本)9781728106069
In the modern world, image transmission, including transmission of television and video signals, is carried out using a preliminary and restorative correction according to the law, which was due to the use of imaging devices on cathode ray tubes. This law differs from the law of dependence of the visibility threshold of a visual stimulus on its magnitude, but continues to be used for compatibility reasons. Therefore, in the work, instead of linearizing the sensations of the quantization scale of a television signal, it is proposed to optimize the choice of code combinations for image transmission. This approach can be effective in television systems without compression of video information with losses, for example, for transmitting signals over short distances or in channels for transmitting signals of the image of Earth remote sensing systems
An algorithm for determining the conditions under which the multi-position amplitude-phase manipulated signal at the output of the communication channel becomes a cyclostationary process is presented. The results of i...
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ISBN:
(纸本)9781728106069
An algorithm for determining the conditions under which the multi-position amplitude-phase manipulated signal at the output of the communication channel becomes a cyclostationary process is presented. The results of its use were used to estimate the resolution times and effective memory for various types of amplitude-frequency responses of the channel presented in this paper. New properties were revealed for channels with ISI
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