The Establishment and Verification of a Velocity Doppler Transfer Model for Dual-Beam Squint Airborne SAR
Measuring ocean currents is essential for oceanographic studies, and dual-beam squint airborne SAR measurements provide significant advantages, including flexibility, cost-effectiveness, and extensive coverage. However, substantial attitude changes in the airborne platform introduce challenges to ac...
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| Main Authors: | , , , |
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| Format: | Article |
| Language: | English |
| Published: |
MDPI AG
2025-08-01
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| Series: | Remote Sensing |
| Subjects: | |
| Online Access: | https://www.mdpi.com/2072-4292/17/15/2743 |
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| Summary: | Measuring ocean currents is essential for oceanographic studies, and dual-beam squint airborne SAR measurements provide significant advantages, including flexibility, cost-effectiveness, and extensive coverage. However, substantial attitude changes in the airborne platform introduce challenges to achieving accurate ocean current measurements. Additionally, existing attitude correction methods fail to account for the off-nadir angle and squint angle errors of targets located at the edge of the beam’s ground footprint, further impacting measurement precision. To address these limitations, this paper proposes a dual-beam squint airborne velocity Doppler transfer model. The squint antenna view vector is initially defined in the aircraft-centered frame of reference and subsequently described using the flightpath frame of reference. By estimating the Doppler frequency caused by aircraft attitude changes, the velocity Doppler transfer model is established. This model is then applied to invert sea surface currents. An error analysis is conducted, and the Monte Carlo method is employed to validate the model’s accuracy. The results demonstrate that the proposed velocity Doppler transfer model effectively inverts sea surface currents with high accuracy in both velocity and direction. Compared to pre-existing methods, the proposed model shows superior performance, particularly in addressing off-nadir and squint angle errors, thereby enhancing overall measurement precision. |
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| ISSN: | 2072-4292 |