Here we present an original primarily CH4 and secondarily CO2 detection payload, based on an
optically simple, compact, light and low energy consumption architecture, which is compatible with
integration in a small cubesat of <2U size or with a typical microsatellite secondary payload.
It is based on a custom multispectral optical filter working in the spectral range 1.6-1.7 μm
integrated with a commercial lens and InGaAs detector. The filter contains 5 bands of 10 nm fwhm
each, best trade-off between fine spectral resolution and robust SNR for a typical micro/nanosatellite
capacity. The filter has one band for the CO2 detection and two bands for CH4 detection, they have
been chosen to maximize each gas absorption in the SWIR range 1600-1700 nm.
An original albedo retrieval method has been developed, based on a linear
interpolation between the 2 albedo bands, spectrally closely correlated to the CH4 and CO2 bands.
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