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Báo cáo hóa học: " Research Article Estimation of Radar Cross Section of a Target under Track"

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 Estimation of Radar Cross Section of a Target under Track | Hindawi Publishing Corporation EURASIP Journal on Advances in Signal Processing Volume 2010 Article ID 610920 6 pages doi 10.1155 2010 610920 Research Article Estimation of Radar Cross Section of a Target under Track Young-Hun Jung 1 Sun-Mog Hong 2 and Seung Ho Choi3 1 Agency for Defense Development Yuseong P.O. Box 35-1 Daejeon 305-600 Republic of Korea 2 School of EE Kyungpook National University Daegu 702-701 Republic of Korea 3 Department ofEIE Seoul National University of Technology Seoul 139-743 Republic of Korea Correspondence should be addressed to Sun-Mog Hong smhong@ee.knu.ac.kr Received 19 April 2010 Accepted 6 October 2010 Academic Editor Frank Ehlers Copyright 2010 Young-Hun Jung 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. In allocating radar beam for tracking a target it is attempted to maintain the signal-to-noise ratio SNR of signal returning from the illuminated target close to an optimum value for efficient track updates. An estimate of the average radar cross section RCS of the target is required in order to adjust transmitted power based on the estimate such that a desired SNR can be realized. In this paper a maximum-likelihood ML approach is presented for estimating the average RCS and a numerical solution to the approach is proposed based on a generalized expectation maximization GEM algorithm. Estimation accuracy of the approach is compared to that of a previously reported procedure. 1. Introduction Beam allocation in phased array radar tracking is a well-known problem and it has been addressed in a large body of literature 1-6 and the references therein. A goal of the allocation is to minimize the use of radar resources while maintaining a target under track. In the allocation for a track update one of the principal parameters to be adjusted is transmitted power. The .