Status of the design, accommodation and performance of the TRUTHS Hyperspectral Imager at the end of phase B1

Le résumé fourni par la source

The TRUTHS (Traceable Radiometry Underpinning Terrestrial and Helio Studies) mission is a concept initially proposed by NPL which will enhance our understanding of the Earth’s changing radiation budget by an order of magnitude. This is a UK led mission within the ESA Earthwatch programme with prime, platform and instrument being led by Airbus UK. At the heart of the payload is the ability to calibrate the high resolution hyperspectral imager with a SI calibration traceable to national standards using the payload’s on-board calibration system (OBCS). This in turn provides accurate continuous measurements from the top of atmosphere of reflected, lunar and spectral solar radiance. This paper will concentrate on the hyperspectral instrument part of the payload. The optical design boasts low polarisation sensitivity, good MTF and Smile, and has a compact accommodation to optimise the instruments size and weight footprint within the Payload. The electro-optical back end consists of one Teledyne CHROMA-D MCT detector, with low noise and high SNR achieved through cold operation through a passive cooling system. Pixel correction, customised spectral and spatial binning and compression provided by the electronics front end produces an output dataset with a Spatial Sampling Distance (SSD) of 50m over a spectral range from 320 to 2400nm with a Spectral resolution between 0.3 and 7 nm. This paper will summarise the design status of the TRUTHS hyperspectral imager at the end of phase A/B1. The current spatial and spectral performance will be presented as well as the accommodation and thermal performance.

Ce résumé expose les affirmations des auteurs. BNTIC ne l’interprète pas comme une validation indépendante des résultats.