Estimating Scale Discrepancy in Bayesian Model Calibration for ChemCam on the Mars Curiosity Rover
Abstract
The Mars rover Curiosity carries an instrument called ChemCam to determine the composition of the soil and rocks. ChemCam uses laser-induced breakdown spectroscopy (LIBS) for this purpose. Los Alamos National Laboratory has developed a simulation capability that can predict spectra from ChemCam, but there are major scale differences between the prediction and observation. This presents a challenge when using Bayesian model calibration to determine the unknown physical parameters that describe the LIBS observations. We present an analysis of LIBS data to support ChemCam based on including a structured discrepancy model in a Bayesian model calibration scheme. This is both a novel application of Bayesian model calibration and a general purpose approach to accounting for such systematic differences between theory and observation in this setting.
Keywords
Cite
@article{arxiv.2004.04301,
title = {Estimating Scale Discrepancy in Bayesian Model Calibration for ChemCam on the Mars Curiosity Rover},
author = {K. Sham Bhat and Kary Myers and Earl Lawrence and James Colgan and Elizabeth Judge},
journal= {arXiv preprint arXiv:2004.04301},
year = {2020}
}
Comments
21 pages, 10 Figures, submitted to the Annals of Applied Statistics