Radiation Budget Instrument
RBI will fly on the Joint Polar Satellite System (JPSS-2) and potentially following JPSS satellites. Its purpose is to measure the emitted and reflected radiation from the Earth and its atmosphere over a very broad wavelength range from approximately 280 nanometers (mid UV) to 100 microns (far IR). The RBI instrument will continue long-term climate measurements made by the Clouds and Earth’s Radiant Energy System (CERES) instrument on several previous space missions.
Exelis Inc. is building RBI, and SDL is responsible for the ground calibration of the instrument. The calibration entails very accurate measurements of relative spectral response (RSR) of the instrument over the entire wavelength range, absolute response in critical spectral bands, scanning field-of-view footprint on the earth, dynamic range, response linearity, and short-, medium-, and long-term response stability. Concurrent with the observation of ground calibration sources, targets internal to the RBI instrument will be observed to tie the ground calibration to the on-orbit calibration measurements.
The ground calibration will be performed as part of the larger thermal vacuum test campaign at SDL.