Abstract
Abstract A multiple‐frequency method is proposed in the coherent Doppler tomographic imaging technique for artefact reduction. The tomogram recorded is in an annular polar format. To reconstruct the image digitally and to save computing time, an interpolation method is used to transform the recorded data into a rectangular format so that the efficient FFT algorithm can be applied. When the tomogram is recorded with a transparency in the binary state, it is found by simulation that the reconstructed image can be improved by using a higher offset carrier frequency technique. A microwave tomogram recording system controlled by a microcomputer is described. A metallic target is illuminated by a sweep frequency generator in the XN band. The images are both digitally and optically reconstructed. Experimental results which demonstrate the image improvement support the proposed new technique.
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