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http://dx.doi.org/10.6109/jkiice.2017.21.1.215

Performance Analysis of the Active SAS Autofocus Processing for UUV Trajectory Disturbances Compensation  

Kim, Boo-il (Department of Interdisciplinary Program of Weapon Systems Engineering, Specialized Graduate School Science & Technology Convergence, Pukyong National University)
Publication Information
Journal of the Korea Institute of Information and Communication Engineering / v.21, no.1, 2017 , pp. 215-222 More about this Journal
Abstract
An active synthetic aperture sonar mounted on small UUV is generated various trajectory disturbances in the traveling path by the influence of external underwater environments. That is the phase mismatch occurs in the synthetic aperture processing of the signals reflected from seabed objects and fetches the detection performance decreases. In this paper, we compensated deteriorated images by the active SAS autofocus processing using DPC and analyzed the effects of detection performance when the periodic trajectory disturbances occur in the side direction at a constant velocity and straight movement of UUV. Through simulations, the deteriorated images according to the periodic disturbance magnitudes and period variations in the platform were compensated using difference phases processing of the overlapping displaced phase centers on the adjacent transmitted ping signals, and we conformed the improved performance characteristics of azimuth resolution and detection images at 3dB reference point.
Keywords
UUV(Unmanned Underwater Vehicle); Active synthetic aperture sonar; Trajectory disturbances compensation; DPC(Displaced Phase Center); Autofocus processing;
Citations & Related Records
Times Cited By KSCI : 1  (Citation Analysis)
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