Abstract
Synthetic aperture radar (SAR) is traditionally developed to obtain high-resolution images. AS real-time SAR imaging is becoming more and more important, high speed radar signal processing method and high resolution of radar imaging technology are being widely studied. Optical processing provides inherent parallel computing, which can perform 2D Fourier transformation at the speed of light. It will be widely used in real-time space-borne SAR imaging, such as interplanetary mission, disaster monitoring and environmental monitoring. Precise light phase amplitude modulation has a wide range of applications. We did some experiments based on the thesis which presents a superpixel method for full phase and amplitude control of a light beam using a digital micro mirror device (DMD) combined with spatial filter. Compared with the traditional phase amplitude modulator, our system based on DMD have a greater range and accuracy as well as faster processing speed. The principle of our system based on DMD was described. Problems of the calibration of amplitude and the calibration of phase were also analyzed. In order to get better resolution and modulation accuracy, we study the cause of the deviation of the phase accuracy and put forward some methods to improve and compensate the phase modulation accuracy.
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