Scale physical ultrasonic modeling of radar regime of inverse synthetic-aperture

Аuthors

Trofimov V. N.

State Institute of Aviation Systems, 7, Victorenko str., Moscow, 125319, Russia

e-mail: vladtrof@gosniias.ru

Abstract

It describes the technology of scale physical ultrasonic modeling (SPUM) radar systems with Inverse Synthetic Aperture (ISA). SPUM base on analogy laws for propagation and reflection for acoustic and electromagnetic waves. In SPUM scale models of objects are use. The scale factor of SPUM equal to the ratio of the wavelength of the simulated radar to the wavelength signal of the modeling ultrasonic signal. Scale of model M (ratio of the length object to the length of the model) should be equal to the scale factor. Stand SPUM compose of hydroacoustic basin, electromechanical drive for scale model installation, devices for beaming and receiving ultrasonic signals. Two options of stands were suggested: first - for simulation radar echo signals of aircrafts, and second – for simulation radar echo signals of ships. First stand provides linear resolution on an ultrasound of 1 mm. Probing signal have a frequency of 4.5 MHz. Electromechanical drive rotates the model in horizontal plane for aircraft change of course simulation. The received echo signals are recorded in working memory. Data from working memory used for mathematical modelling. Second stand provide linear resolution on an ultrasound of 4 mm. Probing signal have a frequency of 2.79 MHz. Electromechanical drive rotates the model in vertical plane for simulation of a board or keel roll. The received echo signals are recorded and used for mathematical modelling. Results of SPUM: radar images of aircraft A-7 Corsar and mega yacht Ambrosia. Model of aircraft has M=100. Linear resolution of radar image aircraft for the X-range approximately equal of 10 cm. Radar image of mega yacht Ambrosia has linear resolution of 4 mm on ultrasound. Image was obtained for simulation of a board roll. The model of mega yacht Ambrosia has M=350. Thus, simulated radar must have the wavelength of probing signal of  18 cm. The linear resolution of radar image yacht approximately equal of 1.4 m.  It is proposed to use SPUM in the development of ISA radar and system of identification mobile object.

Keywords:

scale physical ultrasonic modeling, inverse synthetic aperture, high resolution radar image

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