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Generalized ISAR--part I: an optimal method for imaging large naval vessels
James A Given1, William R Schmidt
1Naval Research Laboratory, Washington, DC 20375, USA.
Summary
A new generalized inverse synthetic aperture radar (ISAR) process accurately maps ship scatterers, even with ship roll. Combining ISAR with interferometry enables precise 3D localization of key ship features.
Area of Science:
- Radar Systems Engineering
- Naval Technology
- Signal Processing
Background:
- Inverse Synthetic Aperture Radar (ISAR) is crucial for naval surveillance.
- Existing ISAR methods face challenges with dynamic ship movements like roll.
- Accurate 3D localization of scatterers on vessels is essential for target identification.
Purpose of the Study:
- To present a generalized ISAR process robust to ship roll and aspect changes.
- To enable high-accuracy 3D localization of scatterers on large vessels.
- To validate the generalized ISAR process through simulations.
Main Methods:
- Development of a generalized ISAR algorithm accounting for ship roll and aspect variation.
- Derivation of equations for roll-driven and aspect-driven generalized ISAR.
- Simulation of the process under various conditions, including large roll amplitudes.
Main Results:
- The generalized ISAR process effectively maps localized scatterers to peaks in the ISAR plot.
- The process demonstrates robust performance in the presence of moderate ship roll.
- Simulations confirm the method's viability even with simultaneous roll and aspect change.
Conclusions:
- The generalized ISAR process provides a significant advancement for naval ISAR applications.
- Integration with interferometry offers precise 3D scatterer location on ships.
- The developed method enhances ISAR capabilities for dynamic maritime targets.