一种基于广义伪距定位的SAR载机平台位置解算方法

SAR platform positioning method based on generalized pseud-range

在飞机飞行过程中,常常依赖卫星为其提供定位与导航信息,然而这一方法很多场景下失效。机载的惯性导航系统作为替代为飞机提供位置信息,此信息往往与真实值之间存在较大的偏差。基于此,提出一种利用地面控制点反向解算飞机位置的方法,地面控制点即机载SAR对地成像的位置,现有技术可以实现多SAR图像中地面目标的准确定位。另一方面,借鉴伪距定位方法,应用SAR图像中的地面位置实现了对载机平台位置的反向解算。试验结果表明,这一方法切实可行。

While flying, aircrafts often rely on the satellite for positioning and navigation. This method falls under many situations. As an alternative, airborne inertial navigation system(INS) can also provide the position information, which always has a large deviation from the real value. Thus, proposes a method to use ground control points which are the positions airborne SAR imaging on ground. Introduce the pseud-range method for conference and use these control points to compute the position of SAR platform, the experimental results show that this method is feasible.