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为了测量L至X波段之间在七个频带上的主动与被动微波信号,我们己将宽频带响应的H与V极化辐射仪和噪声传送机连接在一起组成一种合成的辐射——散射仪,这种仪器安装在车载升降台上进行测量操作。在1984年及1985年的农作物生长季节,我们使用该仪器,并根据各种农作物的生长发育特点,对甜菜、小麦、玉米等作物进行了散射辐射测量,同时。根据所记录的作物类型,植株间距及植物冠高等内容,对植被覆盖的几何结构也进行了描述,对土壤层的特征则是用湿度、温度剖面及介电常数来刻画,此外,植物水份含量的季节性变化也作为一个变化因子而予以考虑。相应于微波信号的这些参量可以揭示土壤与植被之间的散射和辐射过程之间的相互作用,而辐射与散射特性之间的信号差异可以从己测量的植物类型中识别出来。
In order to measure the active and passive microwave signals in the seven bands between L and X bands, we have connected the broadband-responsive H and V-polarizer and noise transmitter to form a combined radiation-scatter Instrument, this instrument installed in the car lift platform for measurement operations. In the 1984 and 1985 crop growing seasons, we used this instrument and conducted scatterometric measurements of beet, wheat, corn and other crops according to the growth and development characteristics of various crops. According to the recorded crop type, plant spacing and plant crown content, the vegetation cover geometry is also described, the characteristics of the soil layer is characterized by humidity, temperature profile and dielectric constant, in addition, the plant water Seasonal changes in content are also taken into account as a factor of variation. These parameters, which correspond to microwave signals, can reveal the interaction between soil and vegetation scattering and radiation processes, and the signal differences between radiation and scattering properties can be identified from the plant types that have been measured.