Title :
Migration through resolution cell compensation in ISAR imaging
Author :
Xing, Mengdao ; Wu, Renbiao ; Lan, Jinqiao ; Bao, Zheng
Author_Institution :
Key Lab. for Radar Signal Process., Xidian Univ., Shaanxi, China
fDate :
4/1/2004 12:00:00 AM
Abstract :
Range-Doppler (RD) processing is widely used in conventional inverse synthetic aperture radar (ISAR) imaging. The unwanted translational motion of moving targets is compensated by envelope alignment and autofocus. For existing ISAR imaging algorithms, the scatterers´ migration through resolution cells (MTRC) caused by the rotational motion is usually ignored. With the improvement of resolution or the increase of target size, MTRC cannot be neglected. In this letter, the keystone formatting algorithm developed in SAR is used for the MTRC compensation in ISAR. Before the keystone formatting, coherent processing must be performed on the raw phase history data. An effective approach is proposed for this kind of coherent processing. Numerical examples are provided to demonstrate the performance of the proposed approach.
Keywords :
geophysical techniques; image resolution; radar imaging; remote sensing by radar; synthetic aperture radar; ISAR imaging; autofocus; coherent processing; envelope alignment; formatting algorithm; inverse synthetic aperture radar; keystone formatting; migration through resolution cells; range-Doppler processing; range-instantaneous Doppler imaging; resolution cell compensation; rotational motion; target size; targets; unwanted translational motion; Airplanes; Angular velocity; Doppler radar; History; Image resolution; Inverse synthetic aperture radar; Motion compensation; Radar imaging; Radar scattering; Signal processing algorithms;
Journal_Title :
Geoscience and Remote Sensing Letters, IEEE
DOI :
10.1109/LGRS.2004.824766