HRWS synthetic aperture radar ambiguity reduction with widened null steering digital beam forming

High resolution and wide swath synthetic aperture radar (HRWS SAR) can easily satisfy high resolution and wide swath at the same time and it had been widely researched. An algorithm based on null steering was proposed to reduction the range ambiguity or manmade jamming energy in this paper. The range ambiguity or jamming energy can be converted into minimizing power in given directions by using null steering techniques, which is equivalent to least-square null power constrained optimization problem. The optimal weight coefficient of the antenna elements is obtained and with special iterations, the null's depth and width can be effectively controlled. All simulations proved that the range ambiguity or jamming energy can be suppressed successfully.