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Please use this identifier to cite or link to this item: http://hdl.handle.net/10204/1100

Title: Investigating the effect of a targets time-varying doppler generating axis of rotation on isar image distortion
Authors: Abdul Gaffar, MY
Nel, WAJ
Keywords: Axis of rotation
ISAR
Image distortion
Quaternions
Issue Date: Oct-2007
Citation: Abdul Gaffar , MY and Nel, WAJ. 2007. Investigating the effect of a targets time-varying doppler generating axis of rotation on isar image distortion. RADAR 2007: IET International Conference on Radar Systems. Edinburgh, United Kingdom, 15 - 18 October 2007, pp 5.
Abstract: ISAR imaging has potential in assisting with the classification of non-cooperative targets. Blurred ISAR imagery may however lead to misleading classification results. Much research has been done to understand some of the causes of distortion in ISAR imaging mostly under the limited assumption that a targets axis of rotation is constant over the CPI. This paper investigates how the targets time-varying Doppler generating axis of rotation, caused by the complex 3D motion of a target at sea, contributes to ISAR image blurring. Quaternion algebra is used to aid the characterisation of a time-varying Doppler generating axis of rotation on the migration through cross-range cells. Real motion data of a sailing yacht is used to examine the effects of 3D rotational motion on ISAR imagery of point scatterer like simulated targets and the associated blurring. Simulation results show that small yaw rate perturbation during side-view ISAR imaging intervals gives rise to significant changes in the direction of the Doppler generating axis which results in scatters migration through cross-range cells.
URI: http://hdl.handle.net/10204/1100
Appears in Collections:Radar and electronic warfare systems
General science, engineering & technology

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