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Tham khảo sách 'radar technology_2', kỹ thuật - công nghệ, cơ khí - chế tạo máy phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | TOPIC AREA 3 Radar Functional Chain AND SigNAL Processing 10 Multisensor Detection in Randomly Arriving Impulse Interference using the Hough Transform Chr. Kabakchiev1 H. Rohling2 I. Garvanov3 V. Behar4 and V. Kyovtorov3 faculty of Mathematics Informatics - Sofia University 2Technical University Hamburg-Harburg 3Institute of Information Technologies - BAS 4Institute for Parallel Processing - BAS 1 3 4Bulgaria 2Germany 1. Introduction In this chapter several advanced detection algorithms for Track-Before-Detect TBD procedures using the Hough Transform HT are proposed and studied. The detection algorithms are based on the scheme described in Carlson et al. 1994 to use the Hough transform for simultaneous target detection and trajectory estimation. The concept described in Carlson et al. 1994 accepts that a target moves within a single azimuth resolution cell and the distance to the target is estimated for several last scans forming the r-t data space. The Hough transform maps all points from the r-t space into the Hough space of patterns. The association with a particular pattern is done by thresholding the Hough parameter space with a predetermined threshold. In order to enhance the target detectability in conditions of Randomly Arriving Impulse Interference RAII a CFAR processor is proposed to be used for signal detection in the r-t space instead of the detector with a fixed threshold as it is suggested in Carlson et al. 1994 . The results obtained show that such a Hough detector works successfully in a noise environment. In real-time and realistic applications however when the two target parameters range and azimuth vary in time the usage of the Polar Hough transform PHT is more suitable for radar applications because the input parameters for the PHT are the output parameters of a search radar system. Such a Polar Hough detector combined with a CFAR processor is proposed for operation in RAII conditions. The results obtained by simulation illustrate the high .
