Modified Frequency Scaling Algorithm for Synthetic Aperture Imaging Ladar Imaging Through the Turbulence

In strip-mode synthetic aperture imaging radar, the spatial resolution in range is given by afrequency-swept waveform, whereas the resolution in theorthogonal direction is derived from the record of phaseas the beam footprint executes linear motion over the object. The combination of the laser and SAR processingtechniques should pave the way for a higher resolution airborne or space borne remote sensor. Regarding the ladartransmitting FMCW signal, the motion during the transmission of a sweep and the reception of the correspondingecho were expected to be one of the major problems. Thegiven modified frequency scaling algorithm is taking thecontinuous motion into account, which can compensate forthe Doppler shift induced by the continuous motion effciently. And then, simulation of Phase screen (PS) distorted by atmospheric turbulence following the von Karman spectrum by using Fourier Transform is implementedin order to simulate turbulence. Finally, the computer simulation shows the validity of the modified algorithm and ifin the turbulence the synthetic aperture length does notexceed the similar coherence length of the atmosphere forSAIL, we can ignore the effect of the turbulence.