The Receiver Configuration and the Choice between Single-sideband and Double-sideband Mode of Synthetic Aperture
综合孔径辐射计的接收机结构及单双边带选择

According to the different method of I/Q demodulation,the receivers of the synthetic aperture radiometer have two configurations,which are referred to as I/Q down-conversion and I/Q demodulation after down-conversion.It is analyzed that whether or not the mirror-image is produced when the synthetic aperture radiometer,with the two receiver configurations respectively,images the targets at single-sideband and double-sideband mode.The results show that the mirror-image is produced when the synthetic aperture radiometer with I/Q demodulation after down-conversion receivers configuration images the targets at double-sideband mode,not produced at the other cases.Through the signal analysis in frequency domain,the mirror-image is produced because the minus frequency components of the RF input signals are mixed into the analytic IF output signals when the RF input signals are processed by the receivers.At last,the comparison between the single-sideband and double-sideband mode of synthetic aperture radiometer and the radiant point-source imaging simulations,which prove the results of mirror-image analysis,are carried out.