Персона: Валуев, Виктор Васильевич
Email Address
Birth Date
Результаты поиска
SYNTHESIS OF RADIO IMAGES BY MICROWAVE PHOTONICS METHODS
The radio vision is the most promising method for the maximum possible information about objects to obtain. Below are the basic methods for image synthesis by means of the radio vision: 1. Method of holography. The reference microwave signal is added to the microwave echo signal and then the intensity of an interference pattern is measured and digitized. After digital processing, the image of the object is reconstructed. 2. A method for determining the amplitude-phase distribution in the receiving antenna opening and obtaining an image of the object after digital data processing. 3. The inverse synthetic aperture radar (ISAR) method. This method uses versatile signal processing technique rather than large aperture antennas to identify and reconstruct a moving target. 4. The MIMO (multiple inputs, multiple outputs) method based on distributed radar network.
Creating an Optical Comb of Reference Frequencies in an Optoelectronic Oscillator
© 2022, Allerton Press, Inc.Abstract: Two ways of creating an optical comb in an optoelectronic oscillator are proposed and investigated. The first is based on using a multimode regime of operation in an optoelectronic oscillator; the second, on a modulation expansion of the laser line using high indices of modulation. Characteristics of the two schemes are investigated by means of numerical modeling.
Characteristics of a Distributed Locational System with an Ultra-Wideband Probing Signal
Reference frequencies comb generation for microwave photonics ADC with signal spectral-interval estimation
Formation of a reference frequency comb in a circuit comprising a highly stable continuous laser and an amplitude Mach-Zehnder modulator with two independent RF inputs working with large modulation index for use in a high-speed microwave photonics ADC with spectral-interval estimation is investigated by numerical simulation. In such ADCs, the entire spectrum of the input signal is divided by microwave photonics elements into spectral intervals, each of which uses a microwave photonics converter to transform the signal to an intermediate frequency (for each part of the spectrum of the microwave input signal, its own reference frequency is used for heterodyning). The requirements for a multimode source of optical reference frequencies for high-speed microwave photonics ADC are formulated. To study the characteristics of such a source, numerical modeling is carried out. It is shown that the frequency noise of the laser can be partially suppressed due to their compensation when converted to an intermediate frequency. Experimental study of the reference frequency comb generator layout showed a good agreement of the obtained characteristics with the results of numerical simulation.
Formation of Broadband Microwave Signals and Multichannel Frequency Conversion with a Microwave Photonics Reference Frequency Spectrum Generator
© 2021, Allerton Press, Inc.Abstract: Characteristics of a reference optical frequency spectrum formed in a circuit with a continuous laser and an amplitude modulator with a high modulation index are investigated via numerical modeling. The possibility of forming microwave oscillations of a desired frequency is demonstrated, and the generation of a broadband microwave oscillation at the modulation of two or more lines selected from the optical frequency spectrum is studied.
Optical Frequency Comb Generation for Broadband Microwave Photonics Receiver
© 2020 IEEE.Microwave photonics approach for ultrabroadband signals processing has been investigated. In this case, optical filters select reference signals from optical frequency comb, which are used then for down-converting regions of the incoming RF spectrum using optical heterodyning technique. Then, low-rate electronic ADCs process photodetector's outputs enabling full mathematical recovery of the incoming signal.
Optoelectronic Oscillator in Multimode Regime: Tunable Optical Frequency Comb Generation
© 2021 IEEE.A method for generating an optical frequency comb in an optoelectronic oscillator is proposed and investigated. It is based on the modulation expansion of a laser line using large modulation indices. In the proposed scheme, a double-microwave-input amplitude modulator is used in a single-loop optoelectronic oscillator instead of a usual amplitude modulator, and an optical output is arranged after it. The circuit characteristics and parameters of the formed optical frequency comb and microwave oscillation are investigated using numerical simulation, which allows us to study highly nonlinear and multimode regimes. The advantage of the scheme is an easy control of all parameters of the optical frequency comb by changing the frequency of the CW laser, the average frequency of the microwave bandpass filter, and the amplitudes of the modulating signals applied to the modulator arms.
Optical frequency comb in optoelectronic oscillator with delay line and microresonator
We proposed and studied a new method which allows producing an optical frequency comb in an optoelectronic oscillator. In this method, comb parameters can be adjusted by controlling CW laser and microwave filter frequencies and amplitudes of modulating signals supplied to the arms of Mach-Zehnder modulator having two separate microwave inputs. Characteristics of the system were studied with numerical modeling for delay line and mictoresonator in the optoelectronic oscillator loop. © 2022 IEEE.