Thepaper proposes specialmultiple-input single-output synthetic aperture radar (MISO-SAR) andmultiple-inputmultiple-output\nSAR (MIMO-SAR) for bidirectional imaging, which can simultaneously illuminate two areas from different directions in azimuth.\nFor the proposed MISO-SAR, two subpulses with the same carrier frequency and phase coding are transmitted with different\nazimuth directions by switching the phase coefficients in the transmit modules, and echoes corresponding to the subpulses are\nreceived by the main lobe and the first grating lobe of the whole antenna. To suppress mutual interference, the two subpulses are\ntransmitted with different range-frequency bands, and their echoes are demodulated and recorded in different channels in the\nproposed MIMO-SAR. This paper presents the system design of these modes and analyzes their azimuth ambiguity to signal ratio\n(AASR). Besides, simulation results on points are carried out to validate the proposed bidirectional imaging modes.
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