This Horizon Europe grant is to be understood within a wider context on EUSST, where other grants are being executed simultaneously with the common objective of improving the EU autonomy on Space Surveillance and Tracking. In particular, this TOP focuses on: - R&I activities are necessary in the sensor domain, both for radiofrequency (i.e., radars, etc.) and optical sensors (i.e. telescopes and innovative wide field optical sensors).. - Contribution to a consolidated and efficient EUSST sensor function. - Improve coverage area, geographical location and performance they can offer: - Ensure an optimum evolution of the configuration and use of the EUSST sensors network - Improved integration and connectivity of value added sensors, ensuring their compliance to the minimum quality requirements (including protocols, procedures, formats and calibration status). Based on the architecture and added value analysis carried out by EUSST, the following assets will be upgraded: - CZ_Shot (tracking telescope in Europe) - ES_S3TSR (surveillance radar in Europe) - FR_GRAVES (surveillance radar in Europe) - FR_GRAVES_NG (surveillance radar in Europe) - FR_TAROT (survey&tracking telescope) - GR_Kryoneri2 (tracking telescope in Europe) - GR_Baker_Nunn (survey telescope in Europe) - PT_Radar (tracking radar in Europe) - PT_SURV (survey telescope in Ocenania)