研究目的
To retrieve azimuth velocities of moving targets, specifically vessels, using 2-looks Synthetic Aperture Radar data from a single platform, and to validate the results with ground truth data.
研究成果
The 2-looks TOPS mode enables accurate retrieval of azimuth velocities for moving targets with a single SAR platform, achieving an accuracy of 0.85 m/s (1-σ) when validated with AIS data. This technique, combined with ATI, can provide two-dimensional velocity vectors, demonstrating potential for vessel tracking applications.
研究不足
The small time interval between looks in 2-looks TOPS mode imposes stringent requirements for accurate shift estimation due to low-magnitude shifts and degraded resolution from burst-mode operation. Validation is affected by time lags between SAR and AIS data, and course changes of vessels can introduce errors.
1：Experimental Design and Method Selection:
The study employs the 2-looks TOPS mode for Synthetic Aperture Radar (SAR) data acquisition, using cross-correlation between looks to estimate azimuth shifts and derive velocities. Theoretical models include equations for shift estimation and accuracy prediction based on Signal-to-Clutter Ratio (SCR).
2：Sample Selection and Data Sources:
Data from TerraSAR-X satellite acquisitions over the Bosphorus Strait and Gibraltar Strait, focusing on moving vessels. Ground truth data from Automatic Identification System (AIS) provided by ASTRAPAGING LTD.
3：List of Experimental Equipment and Materials:
TerraSAR-X satellite operating in 2-looks TOPS mode and Dual Receive Antenna (DRA) StripMap mode, with specific parameters such as wavelength, orbit height, and antenna dimensions.
4：Experimental Procedures and Operational Workflow:
Acquire SAR data in 2-looks TOPS and DRA modes, process the data to extract looks, apply incoherent cross-correlation to measure azimuth shifts, compute velocities using derived equations, and compare with AIS data for validation.
5：Data Analysis Methods:
Use cross-correlation for shift estimation, statistical analysis of velocity differences, and standard deviation calculation to assess accuracy.
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