全球卫星导航反射信号遥感的镜面反射点快速估算

Specular Reflection Point Estimation for Global Navigation Satellite System Reflectometry Remote Sensing

近年来,利用全球卫星导航反射信号(global navigation satellite system reflectometry,GNSS-R)进行遥感应用已经成为遥感领域的新技术。镜面反射点是星载GNSS-R遥感测量和建模的主要参考点,其估算的精度和速度对GNSS-R遥感有着显著影响。提出了星载GNSS-R接收机测量中GNSS-R镜面反射点的快速估算方法。首先,总结了镜面反射点的几何特征。根据几何特征,进行了镜面反射点的粗估算。然后,提出了基于角平分线变步长校正精确估算镜面反射点的位置,并通过迭代实现了镜面反射点的精确定位。最后,通过仿真实验验证了所提算法具有较好的准确性和快速性。

In recent years,global navigation satellite system reflectometry(GNSS-R)of opportunity signals has stood as a technique with a great potential for remote sensing applications.A rapid estimation approach of GNSS-R specular reflection point for GNSS-R receiver was presented.Firstly,geometrical characteristics of specular reflection point are summarized.A coarse estimation of the specular reflection point is achieved,according to the geometrical characteristics.Then,the position of specular reflection point is corrected based on angle bisector and precise position of the specular reflection point is achieved by iteration.Finally,the proposed algorithm is validated through simulations,the results show that the proposed algorithm has good accuracy and rapidity compared with other methods.