【摘要】 利用已有的微波后向散射模型模拟计算了水稻的雷达后向散射特性,分析了一个生长周期内水稻冠层与微波电磁波的相互作用。重点分析植物物理参数对其后向散射特征的影响及其随极化而变化的规律,以及这些特征在整个水稻生长周期中的变化规律。输入后向散射模型的数据包括通过田间测量获取的水稻物理参数。在地面测量的同时或准同时获取了中国广东肇庆试验区的多时相雷达卫星（RADARSAT）遥感图像。雷达卫星观测结果和后向散射模型模拟计算结果的比较分析表明:在水稻的生长过程中,水稻的后向散射特征随其物理参数的周期性变化而变化,并且在不同的极化状态具有不同的变化规律,这从理论上预示了多时相多极化雷达遥感技术进行水稻长势监测的潜力。更多还原

【Abstract】 The study simulates the radar backscatter coefficients of rice using developed microwave backscatter simulated model, and analyze the interaction between microwave electromagnetic wave and rice crown within a rice growth cycle. The emphasis is paid attention to the effects of rice physical parameters to the rice backscatter coefficient and the law as polarization variation. The data include the rice physical parameters measured in field and Radarsat-SAR remote sensing multi-temporal images acquired at the same time around Zhaoqing test site, Guangdong province.The comparison between Radarsat-SAR observation results and the backscatter simulated model results shows that rice backscatter characteristic varied as the physical parameters variation in the rice growth cycle, and that the variation law is different with the polarization modes. It provides theoretical support for multi-temporal and multi-polarization SAR remote sensing technology application to rice monitoring and production estimation.更多还原