利用多探测任务数据建立新一代月球全球控制网的方案与关键技术

Scheme and Key Techniques for Construction of New-Generation Lunar Global Control Network Using Multi-Mission Data

目前广泛应用的月球统一控制网2005(Unified Lunar Control Network 2005,ULCN2005)是由1994年的克莱门汀(Clementine)影像和之前的遥感数据联合平差构建的。提出利用21世纪获取的分辨率更高、精度更好的多探测任务数据,建立新一代月球控制网的方案与关键技术。该方案基于全球覆盖的月球遥感影像与激光高度计数据的联合平差,同时利用在月球轨道侦察器窄角相机影像上能高精度定位的绝对定位精度在厘米级的5个激光棱角反射标志点作为绝对控制。此外,还通过新的无线电测量方法对嫦娥三号着陆器进行高精度定位,将其定位结果也作为一个新的绝对控制数据。新一代控制网构建的重点有高精度的轨道器严密及通用成像几何模型的构建、多任务多模态数据间的多尺度特征提取与匹配、最优化多重覆盖影像的选择、全月球整体平差等。基于新的数据和技术,新一代月球控制网的精度和点的密度有望远超ULCN2005。

The widely used Unified Lunar Control Network 2005(ULCN2005) was built based on a combined photogrammetric solution of Clementine images acquired in 1994 and earlier photographic data. In this paper, we present a scheme and key techniques for construction of a new-generation lunar global control network using multi-mission data newly acquired in the 21 st century, which have much better resolution and precision than the old data acquired in the last century. The new control network will be based on a combined photogrammetric solution of an extended global image and laser altimetry network. The five-lunar laser ranging retro-reflectors, which can be identified in LROC NAC images and have centimeter-level 3 D position accuracy, will be used as absolute control points in the least squares photogrammetric adjustment. Recently, a new radio total phase ranging method has been developed and used for high-precision positioning of Chang’E-3 lander; this shall offer a new absolute control point. Systematic methods and key techniques will be developed or enhanced, including rigorous and generic geometric modeling of orbital images, multi-scale feature extraction and matching among heterogeneous multi-mission remote sensing data, optimal selection of images at areas of multiple image coverages, and large-scale adjustment computation, etc. Based on the high-resolution new datasets and developed new techniques, the new generation of global control network is expected to have much higher accuracy and point density than the ULCN2005.