Under an ESA NAVISP co-funded project, a new fully digital TW modem interoperable with the legacy one was developed by Eltvor (CZ), two prototypes were manufactured, and a preliminary test campaign has confirmed the targeted performance. The objectives of the proposed Experimentation Plan are to extend the verification and validation of the newly developed fully digital modem, including long-term testing in a representative environment. Successful completion of this plan should result in the confirmation of the

suitability of this new product for future implementation in the operational TW network.