Patent ID: 7532150
Filing Date: 2009-05-12
Classification: G01S

Abstract:
1. A radar for generating a search mode synthetic aperture image of a patch having a principal scatterer from periodic pulse returns reflected from said patch and said principal scatterer, said radar having a motion, said radar having an antenna illuminating boundaries of said patch from R 0 slant range to R 1 slant range and from an azimuth angle θ 0 to an azimuth angle θ 1 , said radar comprising: an analog to digital converter for converting said pulse returns into a plurality of digital samples; a computer for: motion compensating said digital samples with respect to said motion to obtain a motion compensated digital array; converting said motion compensated digital array to a frequency array in a frequency domain K computing available samples from said frequency array in said frequency domain using a Range Migration Algorithm including a Stolt interpolation; identifying usable samples from said available samples using one or more criteria; removing said usable samples from said available samples to obtain incomplete samples; extracting features related to said patch having a principal scatterer from said usable samples; using said features to extrapolate extrapolated samples from said usable samples; combining said extrapolated samples said usable samples and said incomplete samples for computing said search mode synthetic aperture image of said patch and said principal scatterer.