AbstractThe BBR is one of a suite of instruments to be flown on the EarthCARE space mission. Its role is to make broad-band measurements of earth radiance in terms of reflected solar radiation and emitted thermal infra-red radiation, for use with the other EarthCARE instruments for the study of Earth atmosphere processes. The Broad-Band Radiometer has its design based on the principles and heritage of previous instruments for study of the earth radiation budget (ERB). In common with those instruments it has two measurement bands; short-wave (solar energy 0.25 to 4 μm) and total-wave (0.25 to >50μm), with a long-wave band (thermal emission 4 to >50μm) being obtained by subtraction of the two measured bands. Multiple simultaneous views of the earth at three different view-angles, are used to account for angular variations in radiance. The radiometric accuracy required is 1% in each band, similar to those of the previous instruments, and requiring detailed calibration measurements on-ground and in-orbit. This paper describes the instrument calibration algorithms and the corresponding requirements on the ground calibration of the flight instrument prior to launch. This includes description of the main methods to be used and error sources to be controlled, based on the design heritage and analysis results of the previous ERB instruments.
Journal of Atmospheric and Oceanic Technology – American Meteorological Society
Published: Jun 27, 2017
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