Search

Your search keyword '"Fomina, K. S."' showing total 2 results
Start Over Author "Fomina, K. S."
2 results on '"Fomina, K. S."'

1. Absorbing Elements Based on a Uniform Resistive Film for the Implementation of a Wide Range of Radio Signal Power Attenuations.

Author

Sadkov, V. D., Fomina, K. S., and Pil'kevich, A. V.

Subjects
*UNIFORM spaces, *CONFORMAL mapping, *RADIOS, *INTEGRATED software, *WAVEGUIDES, *ELECTRIC current rectifiers, *RANDOM access memory
Abstract

Rectangular and complex-shaped absorbing elements based on a uniform resistive film are used for constructing waveguide, coaxial, and microstrip attenuators. A decrease in the attenuator's dimensions leads to difficulties in the implementation of low and high attenuations, which requires passing to absorbing elements based on piecewise uniform structures. In this work, topologies of small absorbing elements of the waveguide, coaxial, and microstrip attenuators are proposed to implement a wide range of radio signal power attenuations. They differ from the known elements of attenuators with a two-layer resistive film in terms of their lower temperature stability and sophisticated manufacturing technology. Such attenuation is achieved by using a single-layer resistive film with a central region having a high (cut) or low (conductor) specific resistance. A technique based on the rigorous method of conformal mappings for calculating the proposed absorbing elements is developed. In the considered particular cases, the obtained relations coincide with those known in the literature. Three-dimensional plots of radio signal power attenuation and normalized input resistance as functions of the normalized size of the cut or conductor of the central region are presented. A broad range of possibilities of the control for output parameters of absorbing elements are outlined. The working capacity of the technique is verified by modeling both the equivalent circuit parameters and output parameters of the absorbing elements, namely, input resistance and attenuation, as well as by the analysis of real samples of small add-on absorbing elements of microstrip attenuators with the proposed topologies. The modeling is carried out in the Russian Elcut software package. [ABSTRACT FROM AUTHOR]

Published
2019
Full Text
View/download PDF

2. Technique of beam forming for the radar of railway crossing control.

Author

Balashova, D. M., Burov, V. N., Kuzin, A. A., Mihaylov, A. D., Myakinkov, A. V., Fadeev, R. S., Shabalin, S. A., and Fomina, K. S.

Subjects
*RAILROAD crossings, *PHASED array antennas, *PHASE shifters, *OMNIRANGE system, *RADAR, *OBJECT recognition (Computer vision), *TRACKING radar
Abstract

Railway crossing has always been a source of increased danger for vehicles and pedestrians crossing it. Every year in Russia, several hundred-road accidents occur at railway crossings, dozens of people die. To increase the safety of traffic at railway crossings, automatic systems for detection of objects in the immediate danger zone can be used. These are sensors of optical (cameras, lidars) and radio ranges. The main disadvantage of optical devices is their limited functionality in insufficient visibility conditions: snowfall, rain, fog. Note that the radar is devoid of this disadvantage and retains its specified detection characteristics under any weather conditions. The paper deals with the analysis of the approach to form the directivity characteristics of the phased antenna array for 24 GHz FMCW radar used in the system of automatic control at the railway crossings. The feature of the proposed technique is applying of two widely spaced incoherent omnidirectional in azimuthal plane transmitters that provide the interferometric structure of transmit pattern. The important requirement for radar systems of detecting objects at a railway crossing are a wide field of view (up to 90 degrees) and, at the same time, high accuracy in determining coordinates. The last requirement assumes a relatively high resolution in angular coordinates (several degrees). The proposed structure of the transmitting antenna array allows the improvement of the angular resolution in comparison with the conventional array with the same aperture. The receiving antenna array should provide a low level of the sidelobes and a given beamwidth of the radar directivity pattern. The rotation of the beam of the receiving phased antenna array is carried out in the digital signal processing (DSP) system, since separated phase shifters are also not used in receivers. Optimization was carried out on the level of the side lobes and the resulting width of the radar beam. To reduce the side lobe level, a sidelobe compensation method is used. It is known, zero is formed in DP of the compensation channel in the direction of the maximum of DP of the main channel. In the presented work, the central six channels of the receiver are used to form the main beam. In the case of a compensation beam, the first six channels have the opposite phase to the rest to form a zero of DP. Theoretical justification is presented. The results of mathematical modeling are shown. To study the features of work in a real railway crossing, a prototype of 24 GHz radar was designed. Also, transmit and receive positions of FSR were used. The work of the prototype was studied in the conditions when objects of interest, including cars and pedestrians, were moving through the crossing. The results of the prototype testing are also presented. [ABSTRACT FROM AUTHOR]

Published
2023
Full Text
View/download PDF

Catalog

Books, media, physical & digital resources
See catalog results