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A novel operation mode for spaceborne polarimetric SAR,named polarization space-division adding polarization code-division (PSD-PCD) operation mode,is proposed in this paper through combining polarimetric SAR with elevation digital beam-forming (DBF) on receive.In a pulse repetition interval the up-chirp LFM sub-pulse is transmitted with horizontal polarization antenna,and with some delay the down-chip LFM subpulse is transmitted with vertical polarization antenna to realize code division.After every sub-aperture receives returns from ground,SAR system uses range DBF to separate echoes relative to different sub-pulses in order to realize space division.The system PRF is equal to that of single-polarization SAR,and elevation DBF help reduce range ambiguity effectively.Moreover,the main system parameters,including PRF,delay between two sub-pulses,radar equation and ambiguity are analyzed and compared with those of single-polarization SAR.Simulation results demonstrate the feasibility and validity of PSD-PCD operation mode.
A novel operation mode for spaceborne polarimetric SAR, named polarization space-division adding polarization code-division (PSD-PCD) operation mode, is proposed in this paper through combining polarimetric SAR with elevation digital beam-forming (DBF) on receive. A pulse repetition interval the up-chirp LFM sub-pulse is transmitted with horizontal polarization antenna, and with some delay the down-chip LFM subpulse is transmitted with vertical polarization antenna to realize code division. system uses range DBF to separate echoes relative to different sub-pulses in order to realize space division. The system PRF is equal to that of single-polarization SAR, and elevation DBF help reduce range ambiguity effectively. Moreover, the main system parameters, including PRF, delay between two sub-pulses, radar equation and ambiguity are analyzed and compared with those of single-polarization SAR. Simulation results demonstrate the feasibility and validity of PSD-PCD operation mode.