Dielectric Characteristic Of Vegetation

Active Microwave Remote Sensing with the ability of advancement and nonsubstitutability in acquisition of environment and resources information has developed rapidly. It’s very significant to consider extracting ground information out of Remote Sensing data effectively. Microwave dielectric properties, as important part of Remote Sensing, are the foundation of scattering mechanism and electromagnetic parameters inversion. This thesis studied based on theory and experiment of typical features and vegetation’s microwave dielectric properties, including measurement method, dielectric model and measurement analysis.The thesis introduced the theory about microwave measurement and the indoor dielectric measurement system including waveguide measurement system and coaxial probe measurement system. Waveguide measurement system can handily and accurately measure solid sample, especially for low loss one, like organic glass, soil, vegetation, etc. Coaxial probe system is suitable for high loss medium, especially suitable for liquid substances, such as water, salt water, sea water and oil, etc. This thesis focus on practical application of microwave measurement and development of traditional waveguide transmission/reflection method considering the problem of the algorithm, including positioning error correction, coaxial waveguide calibration, clearance error correction, three equation calculating and magazine analysis method.The thesis focuses on the research of vegetation microwave dielectric properties, including rice, wheat, lima bean and campus turf. The author analyzed the relations and laws between complex dielectrics, frequency, water content and composition. Results are verified with the theory of measurement, vegetation dielectric model are improve, the discrepancy between measuring results and simulation is analyzed. Both this provided the foundation and important basis for different vegetation dielectric models.