Imaging for MIMO Sliding Spotlight SAR Using Stepped Frequency Chirps
Konferenz: EUSAR 2014 - 10th European Conference on Synthetic Aperture Radar
03.06.2014 - 05.06.2014 in Berlin, Germany
Tagungsband: EUSAR 2014
Seiten: 4Sprache: EnglischTyp: PDF
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Autoren:
Luo, Xiulian; Deng, Yunkai; Wang, Robert; Xu, Wei; Guo, Lei (Institute of Electronics, Chinese Academy of Sciences, China)
Inhalt:
To achieve two-dimensional ultra high resolution and wide swath, this paper applies the stepped frequency chirps to the MIMO sliding spotlight SAR, where each subaperture transmits a different subband. During the imaging, multichannel reconstruction and bandwidth synthesis are embedded into the “two-step” focusing approach. Since the frequency range for each subband is different, a range-frequency-dependent reference function (FDRF) combined with chirp z-transform (CZT) is employed during the azimuth preprocessing. Moreover, the FDRF removes the residual Doppler bandwidth introduced by deramping with a range-frequency-independent reference function (FIRF). Simulation experiment is performed to validate the presented imaging approach.