It is shown that the image reconstruction of the rotating point target(s) may be obtained by the circular convolution algorithm from the simulated and measured data of the angular spectrum of the scattered fields. Using the circular convolution algorithm with a single frequency continuous wave, one wavelength resolution is successfully obtained. Different reflectivity of the target yields the difference in the reconstructed image intensities.
The multiple frequency data yields the reduction of side lobe levels but the less angular data blurs the image point.
Finally, the comparison of image reconstruction of radially symmetric object (ex. cylinder) is made both by the circular convolution and the 2-dimensional FFT algorithm.
