海水盐度遥感反演精度的理论分析

利用海面微波辐射的理论模型和海水介电常数计算公式，对影响海水盐度遥感反演精度的有关因素进行了分析计算，包括波段的优选、极化方式和入射角的设计、温度和盐度对反演精度的影响。结果表明，降低亮温对温度的敏感性应该作为选择盐度遥感波段时考虑的一个重要条件，双极化、较大入射角的天线工作方式有助于提高盐度遥感的精度，但是在低温或低盐条件下仍难以达到较高的盐度反演精度。

Theoretic Analysis on the Retrieval Precision of Ocean Salinity Remote Sensing

Based on the microwave radiation model of sea surface and the dielectric constant formula of sea water, the factors that influence the retrieval precision of ocean salinity remote sensing are analyzed respectively, including the adaptive band, polarization and incidence of the microwave radiometer, the temperature and salinity of the target. One of brief considerations in selecting the microwave band for salinity remote sensing is to reduce the sensitivity of bright temperature on target temperature. Although dual polarization and larger incidence are of benefit to improve the precision of salinity remote sensing, it almost is impossible to approach a high precision in low temperature or low salinity.