This paper introduces a new waveform encoding technology on azimuth-fast time domain for space borne synthetic aperture radar (SAR)

this technology can obtain high resolution wide swath imaging capacity by combining the azimuth multiple beams with multiple phase centers.On the transmitter

intrapulse scanning technolog is utilized to form multiple narrow beams on azimuth in this system

which can reduce the sub-doppler bandwidth

and the elevation beam is widened for wide imaging swath.On the receiver

multiple equivalent phase centers are produced both on azimuth and elevation

the range ambiguity is deducted as the result of multiple sub-waveforms separated by digital beam-forming (DBF) on elevation

and the azimuth doppler ambiguity is deducted by doppler spectral reconstruction method.Finally

the multiple sub-doppler spectra are combined to achieve high azimuth resolution.Moreover

the primary system parameters and performance advantage are analyzed.Simulation results confirm this new system can fulfill high resolution wide swath imaging

also within condensed configuration than other space borne SAR system.