Title :
ISAR Imaging of Ship Based on the Modified 4th Order Time-Frequency Distributions with Complex-Lag Argument
Author :
Wang, Ran ; Jiang, Yicheng
Author_Institution :
Res. Inst. of Electron. Eng. Technol., Harbin Inst. of Technol., Harbin, China
Abstract :
ISAR imaging method, based on conventional time-frequency distribution, can not meet the requirements of the ISAR ship imaging, due to the complexity of the ship´s movement. Time-frequency distribution with complex-lag argument (CTD) is a new kind of time-frequency distribution which has good time-frequency concentration. Methods of reducing the cross terms of CTD for multi-component FM signals have been proposed for recent years. In this paper, based on the analysis of a cross-term reduced 4th order CTD (CTD4) algorithm, the scale problem and the image-truncation problem of the original algorithm have been pointed out and their modified algorithm is proposed. This modified CTD4 can be applied to the ISAR Range-Instantaneous Doppler (RID) imaging. The imaging experiments using simulation signal and real data of ship have shown the effectiveness of the modified algorithm.
Keywords :
Doppler effect; FM radar; radar imaging; synthetic aperture radar; time-frequency analysis; ISAR RID imaging; ISAR ship imaging; complex-lag argument; cross-term reduced CTD4 algorithm; cross-term reduced fourth order CTD algorithm; image-truncation problem; inverse synthetic aperture radar; modified fourth order time-frequency distributions; multicomponent FM signals; range-instantaneous Doppler imaging; simulation signal; Algorithm design and analysis; Doppler effect; Frequency modulation; Imaging; Marine vehicles; Radar imaging; Time frequency analysis;
Conference_Titel :
Remote Sensing, Environment and Transportation Engineering (RSETE), 2012 2nd International Conference on
Conference_Location :
Nanjing
Print_ISBN :
978-1-4673-0872-4
DOI :
10.1109/RSETE.2012.6260606
