Nowadays, new economic models advocating agility and innovation are emerging in the space sector, this is the “New Space”. New nanosatellites, micro-launchers and other new technologies make it easier to access and use space. For this reason, in December 2019, HEMERIA launched in partnership with CNES its first nanosatellite named Argos Neo on a Generic Economical and Light Satellite (ANGELS), currently in orbit and operational. ANGELS aims to validate the concept of a nanosatellite demonstrator of the platform's equipment and to validate the payload allowing satellite coverage for Argos beacons. Retrieving and analysing satellite telemetry is therefore essential. After studying ANGELS architecture, I developed new and more accurate Python scripts to analyse telemetry (including daily averages instead of monthly averages). Then, I validated and verified Python scripts results thanks to a comparison with current ANGELS activities reports. Finally, I compared Telemetry with the results of electrical and thermal prelaunch analyses (PDR and CDR reviews). Thus, the analysis between the pre-launch studies and Telemetry allowed to identify areas of improvements providing useful feedback for the new KINEIS constellation development.