研究目的
To demonstrate the capabilities of nano-satellites and the versatility of a Software Defined Radio for passive Earth Observation by integrating three different microwave payloads into a single unit CubeSat platform.
研究成果
The 3Cat-4 mission successfully demonstrates the integration of three different passive microwave payloads into a single unit CubeSat using a Software Defined Radio, showcasing the potential for cost-effective and versatile Earth observation technologies.
研究不足
The hardware limitations of the SDR require dividing the radiometry band into 27 bins of 1MHz each for data acquisition. The satellite's velocity induces a Doppler shift in the received signals, requiring compensation techniques.
1：Experimental Design and Method Selection:
The mission integrates a multi-constellation and dual-band GNSS-R receiver, a total power radiometer with RFI mitigation, and an AIS receiver into a single unit CubeSat using a Software Defined Radio.
2：Sample Selection and Data Sources:
The experiments use signals from GPS and Galileo satellites, L-band radiometry signals, and AIS signals from vessels.
3：List of Experimental Equipment and Materials:
Includes a Computer On-Module, SDR platform, RF Module, and various antennas for different frequency bands.
4：Experimental Procedures and Operational Workflow:
The SDR captures raw data for each experiment, which is then processed to generate Delay-Doppler Maps for GNSS-R, power measurements for radiometry, and decoded messages for AIS.
5：Data Analysis Methods:
Uses Fast Fourier Transform for GNSS-R signal acquisition, statistical Kurtosis normality test for RFI mitigation in radiometry, and a filter bank plus frequency locked loop for AIS signal demodulation.
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