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Radar technolog Part 8

Tham khảo tài liệu 'radar technolog part 8', kỹ thuật - công nghệ, cơ khí - chế tạo máy phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | Multisensor Detection in Randomly Arriving Impulse Interference using the Hough Transform 193 Fig. 14. An observation of a target in the range-azimuth plane after NSC radar scans Fig. 15. An observation of a target in polar coordinate system after Nsc radar scans The polar Hough transform maps points targets and false alarms from the observation space polar data map into curves in the polar Hough parameter space termed as the p-0 space Fig. 16 . The results of transformation are sinusoids with unit magnitudes. Each point in the polar Hough parameter space corresponds to one line in the polar data space with parameters p and 0. A single p-0 point in the parameter space corresponds to a single straight line in the range-azimuth data space with these p and 0 values. Each cell from the polar parameter space is intersected by a limited set of sinusoids obtained by the polar Hough transform. The sinusoids obtained by the transform are integrated in the Hough parameter space after each of radar scans Fig. 17 . In each cell of the Hough parameter space is performed binary integration and comparison with the detection threshold. If the number of binary integrations BI in the polar Hough parameter space exceeds the detection threshold target and linear trajectory detection is indicated. Target and linear trajectory detection is carried out cell by cell in the entire polar Hough parameter space. In order to compare the effectiveness of the two detectors the CFAR BI detector Fig. 18 and 19 and the Hough detector with a CFAR BI processor Fig. 20 and 21 their performance is evaluated for the case of RAII using the two methods analytical and Monte Carlo. 194 Radar Technology 0 20 40 60 80 100 120 140 160 180 Theta Fig. 16. Hough parameter space showing the sinusoids corresponding to the data point from Fig. 14 111 50 0 theta Fig. 17. Binary integration of data in Hough parameter space for example shows on Fig. 15 Fig. 18. Probability of detection of CFAR BI processor analytically