Multi-channel scan mode and imaging algorithm for synthetic aperture ladar

The tunable band of ladar which is limited by the velocity of the laser's tunable component contradict with the pulse repetition frequency (PRF), in SAL. Meanwhile, the swath of SAL is small for the micro-meter wavelength. This paper gives a novel imaging mode of SAL, which combines multichannel technique and Scan mode SAL. This system makes full use of information of the space domain with multichannel, and removes the ambiguity of the frequency domain in the azimuth direction. And then, controls the beam to scan in different swathes for a better width of the imaging scene, which could lead to a reasonable resolution loss. In view of the ambiguity in Scan mode, SPECAN analysis is utilized to resolve the ambiguity. Finally, the simulation proves the validity of the given method.