Experimental Investigations on the distortion of ISAR Images Using Different Radar Waveforms

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Authors
  1. Wong, S.
  2. Riseborough, E.
  3. Duff, G.
Corporate Authors
Defence R&D Canada - Ottawa, Ottawa ONT (CAN)
Abstract
Experimental results have shown that the Inverse Synthetic Aperture Radar (ISAR) image of a target can be distorted severely as a result of a small perturbing motion possessed by the target. This has been observed regularly in radar images of moving targets such as in-flight aircraft, ships sailing on high seas and maneuvering ground vehicles. A Target Motion Simulator apparatus that simulates a target with small perturbing motion has been designed and built to study the ISAR distortion experimentally. A series of measurements under controlled conditions have been conducted to collect the distorted ISAR image data. Two different radar waveform types, pulse compression and stepped frequency, are used in this investigation. The purpose of the experiment is to determine whether the radar waveform also plays a role in the distortion of ISAR images. A systematic analysis has been carried out to characterize the resulting ISAR distortion from images generated by both types of waveforms. Results indicate that the distortion is independent of the radar waveform used. This information will be useful for development image refocusing procedures to restore distorted ISAR images for target identification applications.

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Keywords
ISAR Imaging;Image distortion;Doppler motion;Radar waveforms;Pulse compression waveform;SFWF (Stepped Frequency Waveform)
Report Number
DRDC-OTTAWA-TM-2003-196 — Technical Memorandum
Date of publication
01 Sep 2003
Number of Pages
30
DSTKIM No
CA023291
CANDIS No
520548
Format(s):
Hardcopy;CD ROM

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