The study of three dimensional radar imaging techniques

The 3-D imaging techniques can form reflectivity images by processing the backscattering coefficients within a given frequency bandwidth and cross-range scan. This processing can be seen as a frequency integration and a 2-D convolution. In the practical implementation, the acquired data on a 2-D planar aperture is first transformed using a 2-D horizontal/vertical cross-range FFT, then compensates the wave-front curvature of all scatters at the same ground range through the matched filter, next corrects the residual range curvature of all scatters by stolt interpolation, and finally apply a 3-D IFFT to reconstruct the 3-D reflectivity image. The commonly distance requirement, the imaging formulation, algorithm implementation and sampling criteria are all studied in the paper. Efficiency and accuracy of this technique is tested by the numerical simulations..