CDMA-BASED 3D IMAGING METHOD FOR FOCAL PLANE ARRAY LIDAR

摘要

A focal plane array light detection and ranging 3D imaging method based on a code division multiple access technique is provided. A narrow laser pulse is shaped into a flat-top beam. The shaped beam is space-time encoded by a focal plane array-based optical encoder. The encoded beam is projected onto the target. The echo signals are obtained by a collecting lens. According to the encoding rule, the signals are grouped and multiplexed into several channels; subsequently, the multi-channel multiplexed signals are captured by a focal plane array detector and converted by a multi-channel digitizer. The multi-channel encoded full waveform signals are acquired from the digitizer by a PC terminal. The encoded full waveforms can be demodulated into the flight ranges for all subpixels via signal processing. By orthogonal range correction and pixel splicing and integrating the geographical data of all pixels, the 3D image reconstruction of the target can be accomplished.