Research On Imaging Algorithm Of Synthetic Aperture Ladar On Moving Platform

Synthetic aperture ladar is combination of Synthetic aperture radar and lasar radar, which can make breakthrough of microwave diffraction limit. As the only optical mean to achieve super high resolution, SAL has broad application prospection. As laser have short wavelength, Synthetic aperture ladar is sensitive to optical path change, so that the imaging algorithm on moving platform is a project with significance.The paper mainly study the imaging algorithm on SAL based on moving platform. Build a simulation model of SAL phase coding system. The differenced SAL receiving system with two sub-apertures along range direction is proposed and its efficiency is simulated by using the measured POS data to analysis the route deviation in airborne environment and by observing and analysis the optical distance change originate from mechanical vibration on platform. Meanwhile, on algorithm side proposed optimization algorithm to compensate the phase error and take the first norm of differenced data as evaluation function. The image is formatted by data from demo system based on desktop and external imaging system to verify the effect of optimization algorithm on phase compensation.The paper has following innovation points: 1. Make researches on phase coding model, proposed the method of matrix multiplication to achieve sidelobe suppression. 2. For the first time, proposed two sub-apertures along range direction of difference synthetic aperture ladar and make simulation based on measured POS data. Make it possible to realization the SAL in engineering. 3. For the first time modeled non-ideal optical distance change, compensate the phase of laser echo so that the phase error caused by non-ideal optical distance change would be inhibited by optimization algorithm and take first norm of differenced data as evaluation function as evaluation function which can measure the compression quality of block target.