Wavenumber-Domain Joint Estimation of Rotation Parameters and Scene Center Offset for Large-Angle ISAR Cross-Range...

Area of Science:

• Radar Systems Engineering
• Signal Processing
• Electromagnetics

Background:

• Traditional wavenumber-domain methods for large-angle inverse synthetic aperture radar (ISAR) cross-range scaling are limited by non-uniform target rotation and scene center offset (SCO).
• Accurate parameter estimation is crucial for effective ISAR imaging, especially under complex motion conditions.

Purpose of the Study:

• To introduce a novel, accurate large-angle ISAR cross-range scaling method.
• To address the limitations imposed by non-uniform rotation and SCO in ISAR imaging.
• To enhance the precision of ISAR cross-range scaling for complex targets.

Main Methods:

• Development of a non-uniform rotational wavenumber-domain signal model incorporating SCO.
• Proposal of a joint estimation algorithm combining particle swarm optimization (PSO) and image entropy evaluation.
• Derivation of range and cross-range scaling factors using estimated parameters within the wavenumber domain.

Main Results:

• Accurate estimation of parameters related to non-uniform rotation and SCO.
• Achieved higher accuracy in ISAR cross-range scaling compared to traditional methods.
• Demonstrated effectiveness and robustness of the proposed method through simulations.

Conclusions:

• The proposed joint estimation method effectively overcomes limitations in large-angle ISAR cross-range scaling.
• This approach offers a more accurate and robust solution for ISAR imaging of targets with complex motion.
• The validated method has significant implications for advanced radar imaging applications.