摘要
飞机飞行过程往往依赖卫星为其提供定位导航服务,然而这一方法在很多场景下失效。作为替代,机载惯性导航系统(INS)可以提供飞机的大致位置信息,这一结果并不准确。机载合成孔径雷达(SAR)可以实时获取地面高清图像,因此对于其载机平台而言,考虑通过实现对图像中地物目标的准确定位,并以之作为控制点对平台位置实现反向解算。基于此,本文利用了基于异源图像匹配的地物目标定位方法,即通过实时SAR图像与带有准确经纬度信息的光学基准图进行图像匹配,准确计算SAR图像中相应地物的位置信息。进而,本文创新地提出了基于广义伪距定位的平台位置解算方法,并在6维INS误差模型下对广义伪距方程进行改进,有效提高了定位精度。试验结果表明,这一方法路线切实可行。
Aircraft often rely on satellite to provide positioning and navigation services during flight,but this method fails in many scenarios.As an alternative,the airborne inertial navigation system(INS)can provide approximate location information of the aircraft,which is not accurate.Airborne synthetic aperture radar(SAR)can acquire high-resolution ground images in real time.Therefore,for its carrying platform,it is considered to realize accurate positioning of ground targets in SAR image and then use it as control point to compute the platform position reversely.Based on this,this paper uses ground target positioning method based on multi-modality image matching,that is,through real-time SAR image and optical reference map with accurate longitude and la-titude information,the position information of corresponding ground targets in SAR image are accurately obtained.Furthermore,this paper innovatively proposes a platform position solution method based on generalized pseud-range positioning,and polishes up the generalized pseud-range equation under the 6-D INS error model,thus effectively improving the positioning accuracy.The experimental results show that this method is feasible.
作者
尹奎英
黄冠
黄照悠
YIN Kuiying;HUANG Guan;HUANG Zhaoyou(Nanjing Research Institute of Electronics Technology, Nanjing 210039, China;China Electronics Standardization Institute, Beijing 100007, China)
出处
《雷达科学与技术》
北大核心
2021年第5期589-597,共9页
Radar Science and Technology
关键词
合成孔径雷达
惯性导航系统
定位
图像匹配
伪距
synthetic aperture radar(SAR)
inertial navigation system(INS)
positioning
image matching
pseud-range
