基于北斗GEO卫星反射信号的海冰反演技术研究

Study on Sea Ice Detection Technology Based on Beidou GEO Satellite Reflected Signals

海冰检测已成为GNSS(全球导航卫星系统)反射信号技术的重要应用方向。为改善极化比海冰反演模型在海冰检测中的准确性,对极化比海冰反演模型的适用仰角范围进行了研究。根据菲涅尔原理,针对渤海海域的菲涅尔反射系数进行了模拟仿真,对极化比海冰反演模型的适用范围进行了理论分析,并开展海冰实验。通过对实验数据的分析,成功反演了渤海海冰的变化趋势,验证了利用北斗反射信号反演海冰的可行性,同时,验证了两种模型的仰角适用范围。实验结果表明:用极化比海冰反演模型弥补偏振比海冰反演模型在高仰角情况下的不稳定性可行。

Sea ice detection has become an important application field for GNSS reflected signal technology.To improve the accuracy of sea ice detection by using the reflected power ratio model,the satellite elevation range applicable to the reflected power ratio model is studied in this paper.According to the principle of Fresnel reflection coefficient,the Fresnel reflection coefficient of the Bohai Sea is modulated,the applicative satellite elevation range of the reflected power ratio model is analyzed theoretically,and the experiment of sea ice detection is carried out.By analyzing the experimental results,the change trend of sea ice of the Bohai Sea is successfully detected,the feasibility of using Beidou reflected signals to detect sea ice is verified,and the elevation ranges applicable to traditional polarization ratio model and the reflected power ratio model are also verified.It is found that the reflected power ratio model is more stable for high satellite elevation than the polarization ratio model.