研究目的
Investigating the calibration challenges for the BIOMASS P-band SAR instrument, including radiometric and polarimetric calibration, and meeting geolocation accuracy requirements.
研究成果
The BIOMASS mission presents unique calibration challenges that require innovative solutions, including the use of targets of opportunity and advanced correction techniques for ionospheric effects. The study emphasizes the importance of the Commissioning Phase for characterizing the antenna and system, and the need for further research to validate the proposed calibration methods.
研究不足
The study highlights the lack of pre-existing P-band data, the infrequent visits to calibration sites, and the challenges posed by ionospheric effects. It also notes the potential limitations in using certain types of targets of opportunity due to insufficient SNR or unknown backscatter properties.
1：Experimental Design and Method Selection:
The study explores the challenges in external calibration for the BIOMASS mission, focusing on the orbital pattern, ionospheric effects, and the lack of pre-existing P-band data. It proposes combining infrequent visits to calibration sites with the use of distributed targets and targets of opportunity.
2：Sample Selection and Data Sources:
The study considers the use of transponders, distributed targets (like deserts and icesheets), and Permanent Point Scatterers (PPSs) for calibration.
3：List of Experimental Equipment and Materials:
The BIOMASS P-band SAR instrument is the primary equipment, with potential use of transponders and passive polarimetric calibrators.
4：Experimental Procedures and Operational Workflow:
The calibration strategy involves characterizing the antenna pattern and system pointing during the Commissioning Phase, using targets of opportunity for routine calibration, and correcting for ionospheric effects.
5：Data Analysis Methods:
The study discusses methods for estimating and compensating for system errors, Faraday rotation, and ionospheric effects, including the use of non-linear optimization and the properties of distributed targets.
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