N.M. Ivanov – Leading Research Scientist, 

JSC «VNII «Gradient» (Rostov-on-Don)

E-mail: qkivanov@list.ru

I.L. Sirenko – General Director of JSC «VNII «Gradient» (Rostov-on-Don)

E-mail: sirenkofam@gmail.com

V.N. Shevchenko – Dr.Sc.(Eng.), Professor, Deputy General Director on Research and Development, JSC «VNII «Gradient» (Rostov-on-Don)

E-mail: vnsh1952@yandex.ru

Synthesis of radio images, or visual representation of airborne objects in radio systems of both active and passive ranging with inverse aperture synthesis is based on a specific model of target movement. Reception of forward and scattered by target signals from any sources that are not part of the radio visual representation system, for example, signals of the broadcasting stations of any frequency range is understood as passive ranging. When the receiving system and the emitter are spaced apart, the problem becomes multi-static.

The procedure for radio imaging a uniformly rotating object in the coordinates of ranging - relative Doppler shift can be reduced to a set of relatively simple operations typical of digital signal processing. The degree of conformance of such processing to the actual situation is determined by the adequacy of the target movement assumption which involves surveillance at the site of intensive maneuvering. Another approach should be used for radio imaging the object in the straight segments of the trajectory which account for a great part of the surveillance time. In particular, wide-spread unmanned aerial vehicles are characterized by relatively small sizes and low movement rates. Consequently, the particular approach should be used for synthesis of radio images of such objects taking into account the above features.

In the present paper, the method for radio imaging straight-moving aircrafts based on solving undetermined system of linear equations. The solution is proposed on the basis of the regularization method with the selection of the regularizing functional in Holder space. The results of numerical simulation show that the developed method can provide a visual representation of a large class of airborne objects in the multiposition systems with inverse aperture synthesis. Field experimental observations of the effectiveness of the method proposed are planned at the subsequent stages of work.

1. Walker J.L. Range-Doppler imaging of rotating objects. IEEE Transactions on Aerospace and Electronic Systems, AES-16. 1980. P. 23−52.
2. Pasmurov A.Ya. Poluchenie radiolokatsionnykh izobrazhenii letatelnykh apparatov. Zarubezhnaya radioelektronika. 1987. № 12. S. 3−30. (in Russian)
3. Martorella M., Giusti E. Theoretical Foundation of Passive Bistatic ISAR Imaging. IEEE Transactions on Aerospace and Electronic Systems. 2014. T. 50. P. 1647−1659.
4. Chen V.C. and Martorella M. Inverse Synthetic Aperture Radar Imaging. NJ: SciTech Publishing. 2014. 304 p.
5. Qiu W., Giusti E., Bacci A., Martorella M., Berizzi F., Zhao HZ., Q. Fu. Compressive sensing for passive ISAR with DVB-T signal. IEEE Transactions on Aerospace and Electronic Systems. 2015. T. 51. P. 2166−2180.
6. Ciucia P., Ider J. A half-quadratic block-coordinate descent method for spectral estimation. Signal processing. 2002. V. 82. № 7. P. 941.