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NanoCarb is an innovative Fourier Transform imaging spectrometer dedicated tothe measurement of CO2 and CH4. Both its unusual optical principle and samplingstrategy allows to reach a compact design, ideal for small satelliteconstellation as investigated by the European project SCARBO. The NanoCarbperformance assessment as well as a proof of concept are required in thisframework. A strategy of design is developed to optimize the performances andreach the sensitivity target of the space mission, demonstrating the potentialof the concept without drastic complexity gain. A preliminary bias mitigationin the retrieval strategy is presented concerning water for CO2 measurement,illustrating the efficiency and the flexibility of the NanoCarb partialinterferogram sampling technic. The presented design reaches a random errorsub-ppm for CO2 and sub-10ppb for CH4, considering a 128 to 192 km swath,respectively, for 2 or 3 km of resolution at ground. A full mitigation of thewater bias is performed on CO2 band thanks to partial interferograms.

NanoCarb part 2: Performance assessment for total column CO2 monitoring from a nano-satellite