Tuyển tập báo cáo các nghiên cứu khoa học quốc tế ngành hóa học dành cho các bạn yêu hóa học tham khảo đề tài: Research Article Efficient and Precise Processing for Squinted Spotlight SAR Through a Modified Stolt Mapping | Hindawi Publishing Corporation EURASIP Journal on Advances in Signal Processing Volume 2007 Article ID 59704 7 pages doi 2007 59704 Research Article Efficient and Precise Processing for Squinted Spotlight SAR Through a Modified Stolt Mapping Marijke Vandewal 1 Rainer Speck 2 and Helmut SuG2 1 Optronics and Microwave Department Royal Military Academy Renaissancelaan 30 Brussel 1000 Belgium 2Deutsches Zentrum fur Luft-und Raumfahrt . DLR Postfach 1116 Wessling 82230 Germany Received 26 January 2006 Revised 29 August 2006 Accepted 29 August 2006 Recommended by Christoph Mecklenbrauker Processing of squinted SAR spotlight data is a challenge because of the significant range migration effects of the raw data over the coherent aperture time. Although in theory the to k -algorithm takes care of these aspects its digital implementation requires a time-consuming interpolation step. Moreover the limited precision of this interpolation can introduce distortions at the edges of the final image especially for squinted geometries. A wave number domain processing using a modified Stolt mapping will be developed and analyzed to enhance the quality of the final SAR image. Additionally the proposed algorithm has a decreased computational load compared to the original to k -algorithm. Simulation results will validate the focusing and efficiency performances of the modified wave number domain algorithm. Copyright 2007 Marijke Vandewal et al. This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use distribution and reproduction in any medium provided the original work is properly cited. 1. INTRODUCTION The atmospheric penetration and long-range capabilities of a synthetic aperture radar SAR combined with its high resolution have made SAR imaging a favored approach for providing twenty-four hour all weather detection and recognition at safe standoff ranges. To achieve high resolution a range dependent filter .
