利用地基双频段微波辐射计测量土壤湿度

利用自行研制的双频段微波辐射计进行地基遥感土壤湿度试验,根据试验测得的数据进行回归分析,得到L、C波段反演土壤湿度经验回归模型。用这个回归模型对随后的降雨过程中土壤湿度进行反演,所得结果与实地采样值有较好的一致性。当土壤湿度小于75%时,亮度温度与土壤湿度呈线性关系。试验结果验证了微波遥感土壤湿度的有效性和可行性。这种根据辐射计实测数据进行线性回归的测定方法简单,适应性强,但一般仅具有局部地区应用价值,对于不同地区和不同条件缺乏普遍适用性。

Experimental Study on Soil Mositure Using Dual-Frequenncy Microwave Radiometer

An experiment of measuring soil moisture was carried out by using Dual-Frequency Microwave Radiometer designed by the authors.The measured data were analyzed by using statistical regression method and the empirical regression model of retrieving soil moisture in L band and C band was developed.The soil moisture in a rainfall event was retrieved using the experiential regression model,which is well consistent with the field sampling value.The results show that when soil moisture is lower than 75%,the brightness temperature is linear with soil moisture.The experiment verifies the effectiveness and feasibility of microwave remote sensing soil moisture.Although this method for linear regression based on the data measured with the radiometer is simple,and has strong adaptability,generally it only has local application value,and lacks universal applicability for different areas and different conditions.So it is very necessary to build a new model based on radiative transfer theory.