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An analysis of Chosen Image Formation Algorithms for Synthetic Aperture Radar with FMCW

Okoń-Fąfara M., Serafin P., Kawalec A.

International Journal of Electronics and Telecommunications

2016

Vol. 62, No. 4

323--328

The modelling of FMCW SAR systems, due to long signal duration time, commonly used start-stop approximation for pulsed radars causes errors in the image. Continuous motion of the radar platform results in additional range-azimuth couplings and range walk term that should be considered in processing of signal from this type of radar. The paper presents an analysis of the following algorithms: Time Domain Correlation (TDC), Range Doppler Algorithm (RDA), and Range Migration Algorithm (RMA). The comparison of the algorithms is based on theoretical estimation of their computation complexity and the quality of images obtained on the basis of real signals of FMCW SAR systems.

Eksperymentalna weryfikacja algorytmu RDA w systemie SAR pracującym z falą ciągłą

Leśnik Cz., Serafin P., Milczarek H

Przegląd Elektrotechniczny

2015

R. 91, nr 3

108-111

Przedstawiony niżej tekst zawiera opis algorytmu syntezy zobrazowania SAR w dziedzinie odległości i częstotliwości dopplerowskiej (ang. Range Doppler Algorithm - RDA), dostosowanego do specyfiki sensora wykorzystującego zmodulowaną częstotliwościowo falę ciągłą FMCW (ang. Frequency Modulated Continuous Wave) oraz opis wyników jego badań. Sensor został opracowany i wykonany na potrzeby systemu radarowego zobrazowania powierzchni terenu zainstalowanego na pokładzie miniaturowego bezzałogowego statku powietrznego (miniBSP).

The article presents a description of the Range-Doppler Algorithm tailored to the specific character of the FMCW sensor as well as a description of the results of the experimental tests. The tested sensor has been developed for a radar terrain imaging system operating from miniature unmanned aerial vehicle.

Modifications of Range-Doppler Algorithm for Compensation of SAR Platform Motion Instabilities

Gorovyi I. M., Bezvesilniy O. O., Vavriv D. M.

International Journal of Electronics and Telecommunications

2014

Vol. 60, No. 3

225-231

Two modifications of the range-Doppler algorithm (RDA) have been proposed to solve problems of SAR platform motion instabilities. First, the multi-look processing based on the RDA with an extended Doppler bandwidth has been introduced for correction of radiometric errors. Second, the RDA has been modified to perform SAR image formation on short-time acquisition intervals to use it in a recently-developed local-quadratic map-drift autofocus (LQMDA) method. The performance of the methods is illustrated with experimental data obtained by airborne SAR systems.