Combining time-frequency transforms to create a sequence of instantaneous range-Doppler images in ISAR processing
In ISAR processing, ship classification is usually based on a range-Doppler (RD) image. The RD image is obtained by combining range alignment, phase compensation and short-time Fourier transform. Nevertheless, this leads to sophisticated approaches to weaken unwanted phenomena such as blurred images. In this paper, an alternative approach is proposed based on the time-frequency analysis. In that case, the Wigner-Ville transform provides geometrical structured events which correspond to the scatterers and unstructured ones which are associated to the artefacts and cross-terms. Taking advantage of these geometrical features, we first suggest computing a time-frequency local gradient analysis. This variational analysis provides a confidence map of the time-frequency distribution we can use to remove artefacts. Then, the practitioner can exploit the corresponding time-frequency images to choose the more appropriate instantaneous RD image. Simulation results confirm the effectiveness of this approach.
Inverse synthetic aperture radar time-frequency analysis aggregation operator gradient coherence map.
Vincent Corretja Eric Grivel Yannick Berthoumieu Jean-Michel Quellec Thierry Sfez Stéphane Kemkemian
THALES SYSTEMES AEROPORTES S.A. 16, avenue Gustave Eiffel, 33600 PESSAC, FRANCE THALES SYSTEMES AERO THALES SYSTEMES AEROPORTES S.A. Université Bordeaux 1 – IPB ENSEIRB-MATMECA – IMS – UMR CNRS 5218 35 THALES SYSTEMES AEROPORTES S.A. 10, avenue de la 1ère dfl, 29200 BREST, FRANCE THALES SYSTEMES AEROPORTES S.A. 2, avenue Gay-Lussac, 78990 ELANCOURT, FRANCE
国际会议
2011 IEEE CIE International Conference on Radar(2011年IEEE国际雷达会议RADAR 2011)
成都
英文
537-540
2011-10-24（万方平台首次上网日期，不代表论文的发表时间）