Multi-beam adaptive beam forming for SAR application and its DSP implementation on T-SHARC

Linear and planar adaptive antennas have been explored since last few decades for employing tailor made multiple beams for synthetic aperture radar applications. DSP implementation of standard beam forming algorithms for space borne synthetic aperture radar processing is discussed here in this paper. A planar adaptive array can be exploited to generate multiple simultaneous beams to cater synthetic aperture radar modes like spotlight, scan and strip map. The multiple beams tend to cater range and azimuth requirement i.e. two dimensional beam forming. Real time DSP can increase cost of implementation of DBF array. Multiple beams are adapted optimally to get required directional beam forming or direction of arrival (DOA) estimation. Uniform linear as well as planar array (ULA-UPA) are modeled based on simulations of various adaptive and non-adaptive algorithms. The state of the art algorithms for adaptive antenna, are utilized for suppressing the interference in directions other than desired and ones, reduce the error by optimally adjusting the weights. The use of analog DSP Tiger SHARC T-101 is suggested here for implementation.