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Selecting the geology filter wavelengths for the ExoMars Panoramic Camera instrument

机译:选择ExoMars全景相机仪器的地质滤光片波长

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摘要

The Panoramic Camera (PanCam) instrument will provide surface remote sensing data for the ExoMars mission. A combination of wide-angle stereo, multispectral, and high resolution imagery will generate contextual geological information to help inform which scientific targets should be selected for drilling and analysis. One component of the PanCam dataset is narrowband multispectral imaging in the visible to near infrared, which utilises a dedicated set of 12 "geology" filters of predetermined wavelength and bandwidth to view the terrain, and provide information on composition and putative mineralogy. The centre wavelengths and bandwidths of these filters were optimised to account for the highly diverse mineralogical terrains the ExoMars rover will hopefully encounter. Six new alternative test filter sets were created, each optimised for the detection of either: sulfates, phyllosilicates, ferric oxides, mafic silicates, iron absorptions, and minor hydration absorptions. These six filter sets were cross-tested using database mineral reflectance spectra and Mars analogue rock multispectral data to find the best performing filter set. Once selected, the bandwidths of this filter set were also optimised. The filter set optimised to ferric oxide minerals was able to most accurately represent rock multispectral data, as well as capture subtle spectra! features of hydrated minerals, including sulfates, phyllosilicates, and carbonates. These filters differ from those used on past missions (e.g., Pathfinder, Mars Exploration Rover) and represent the next evolutionary stage in PanCam instrument development. When compared to past filter sets, the updated ExoMars filters capture rock and mineral spectral data more effectively, enhancing the ability of the ExoMars PanCam to detect lithological and compositional variation within an outcrop.
机译:全景相机(PanCam)仪器将为ExoMars任务提供地面遥感数据。广角立体图像,多光谱图像和高分辨率图像的组合将生成上下文地质信息,以帮助告知应该选择哪些科学目标进行钻探和分析。 PanCam数据集的一个组成部分是从可见光到近红外的窄带多光谱成像,它利用一组专用的12个具有预定波长和带宽的“地质”滤光片来查看地形,并提供有关成分和推断的矿物学的信息。对这些滤光片的中心波长和带宽进行了优化,以应对ExoMars漫游者有望遇到的高度多样的矿物地形。创建了六个新的替代测试过滤器套件,每个套件都经过优化,可检测以下任何一种:硫酸盐,页硅酸盐,三氧化二铁,镁铁质硅酸盐,铁吸收和少量水合吸收。使用数据库矿物反射光谱和火星模拟岩石多光谱数据对这六个过滤器集进行交叉测试,以找到性能最佳的过滤器集。一旦选择,该滤波器组的带宽也被优化。针对氧化铁矿物质进行了优化的过滤器套件能够最准确地表示岩石多光谱数据,并捕获微妙的光谱!水合矿物质的特征,包括硫酸盐,页硅酸盐和碳酸盐。这些滤镜与过去的任务(例如探路者,火星探测漫游者)中使用的滤镜不同,它们代表了PanCam仪器开发的下一个进化阶段。与过去的过滤器集相比,更新后的ExoMars过滤器可以更有效地捕获岩石和矿物光谱数据,从而增强了ExoMars PanCam检测露头内岩性和成分变化的能力。

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  • 来源
    《Planetary and space science》 |2012年第1期|p.80-100|共21页
  • 作者单位

    Department of Earth and Planetary Sciences, Birkbeck College, University of London, Malet Street, WCIE 7HX, UK,Centre for Planetary Sciences at UCL/Birkbeck, Cower Street, London, WC1E 6BT, UK;

    Institute for Mathematics and Physics, Aberystwyth University, Aberystwyth, SY23 3BZ, UK;

    Deportment of Computer Science, Queen Mary, University of London, E1 4NS, UK;

    Department of Computer Science, Aberystwyth University, Aberystwyth, SY23 2AX, UK;

    Department of Earth and Planetary Sciences, Birkbeck College, University of London, Malet Street, WCIE 7HX, UK,Centre for Planetary Sciences at UCL/Birkbeck, Cower Street, London, WC1E 6BT, UK;

    Centre for Planetary Sciences at UCL/Birkbeck, Cower Street, London, WC1E 6BT, UK,Milliard Space Science Laboratory, University College London, Holmbury St. Mary, Dorking, RH5 6NT, UK;

    Centre for Planetary Sciences at UCL/Birkbeck, Cower Street, London, WC1E 6BT, UK,Department of Earth Sciences, University College London, Cower Street, WC1E 6BT, UK;

    Centre for Planetary Sciences at UCL/Birkbeck, Cower Street, London, WC1E 6BT, UK,Milliard Space Science Laboratory, University College London, Holmbury St. Mary, Dorking, RH5 6NT, UK;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    ExoMars; Mars; PanCam; hydrated minerals; reflectance spectroscopy;

    机译:ExoMars;火星;PanCam;水合矿物质;反射光谱;

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