研究目的
To measure ice thickness, basal conditions, and ice-shelf melt rates using an L-band radar system for improving ice-sheet models and sea-level rise predictions.
研究成果
The proposed L-band radar system offers enhanced capabilities for measuring ice basal conditions, thickness, and melt rates, with potential for space or high-altitude deployment. It addresses critical gaps in ice-sheet modeling and sea-level rise predictions, and future work includes field testing in Antarctica.
研究不足
The radar is proposed and not yet built or tested; field deployment is planned for 2018-2019, so actual performance and limitations (e.g., environmental factors, ice loss variations) are not fully known. The system may have constraints in antenna size and power requirements for space or aircraft deployment.
1：Experimental Design and Method Selection:
The methodology involves designing an L-band radar system (
2：2-4 GHz) based on previous success with UHF radars, using link budget analysis to determine system parameters for sounding up to 4-5 km thick ice and detecting thin basal water films. Sample Selection and Data Sources:
The radar will be tested in Antarctica, specifically targeting ice sheets and shelves, with data compared to existing datasets like BEDMAP2 and VHF radar data.
3：List of Experimental Equipment and Materials:
The radar system includes a digital section with DDS, transmitter, receiver, antenna array (e.g., 20x20 slotted microstrip patch elements), and data acquisition unit with FPGA for signal processing.
4：Experimental Procedures and Operational Workflow:
The radar operates with a pulse repetition frequency of
5：5 kHz, transmits chirp signals, receives backscattered signals, and processes data on-board or post-collection for ice thickness, basal conditions, and melt rate measurements. Data Analysis Methods:
Signal-to-noise ratio (SNR) calculations, reflectivity analysis for water film detection, and comparison with historical data to validate measurements.
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