LI Dong, LIAO Gui-sheng, XU Qing, et al. High Resolution Imaging Algorithm for Helicopter-Borne Rotating Synthetic Aperture Radar Using Frequency Modulated Continue Waveform[J]. Acta Electronica Sinica, 2014, 42(1): 1-8.
A frequency modulated continue wave (FMCW) rotating synthetic aperture radar (ROSAR) imaging mode and corresponding imaging algorithm are presented.Firstly
the separated transmit antenna and receive antenna system are equalized to the case of system configuration with antenna both for transmitting and receiving signals according to the equivalent phase center principle.Based on this
by approximating the slant equation with the higher order model
one can obtain accurate two-dimensional frequency spectrum via the series reversion method.The Doppler frequency shift effect
induced by the platform's continuous motion while radar tr
ansmits and receives signals
is analyzed and the approximate compensation method is shown.Finally
efficient Chirp-
Z
transform (CZT) is applied to correct the range-variant range cell migration (RCM) and well-focused SAR image is obtained.Simulation results verify the correctness of the analysis and the validity of the proposed algorithm.