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Single-channel bidirectional synthetic aperture radar(Bi Di-SAR) systems require the pulse repetition frequency(PRF) to be cautiously designed. Firstly, it should be higher than the total bandwidth of the two Doppler subbands; secondly, it should be carefully selected so that the two Doppler subbands are properly located. We introduce multichannel Bi Di-SAR imaging mode to realize bidirectional high resolution wide swath(HRWS) imaging. Acquisition geometry of multichannel Bi Di-SAR is interpreted. Doppler spectrum of Bi DiSAR consists of two subbands with limited bandwidth. Based on a prior knowledge about the location of the Doppler subbands, we derive the method for separating the aliased Doppler spectra for general PRFs. Then,we analyze the reconstruction performance in terms of azimuth ambiguity to signal ratio(AASR) and signal to noise ratio(SNR). Besides, we propose to use a properly designed sparse array antenna to improve the azimuth ambiguity performance. Validity of the signal processing method is verified by simulation results.
It should be higher than the total bandwidth of the two Doppler subbands; secondly, it should be selected carefully so that the two Doppler subbands are properly located. We introduce multichannel Bi Di-SAR imaging mode to realize bidirectional high resolution wide swath (HRWS) imaging. Acquisition Doppler spectrum of Bi DiSAR consists of two Based on a prior knowledge about the location of the Doppler subbands, we derive the method for separating the aliased Doppler spectra for general PRFs. Then, we analyze the reconstruction performance in terms of azimuth ambiguity to signal ratio (AASR) and signal to noise ratio (SNR). Also, we propose to use a proper designed sparse array antenna to improve the azimuth ambiguity performance. Validity of the signa l processing method is verified by simulation results.