The activity aims to develop techniques (e.g. high sensitivity algorithms, data wipe off for Galileo, optimal data plus pilot combinations etc.) in order to enhance the capability of mass market receivers taking into account their typical resources constraints (limited power, memory, open loop platform etc...). The activity shall investigate the application of these techniques for phase and code tracking down to the detailed design of the techniques for different type of usage and in different type of environment.

Open GNSS signal authentication is one of the main future challenges that the GNSS community will have to face in order to support safety critical applications. One of the major evolutions proposed for the Satellite Based Augmentation Systems (SBAS) systems is to provide authentication services to their users. This evolution is still under debate in international fora, therefore this activity proposes to investigate the issue starting from the consolidation of the spoofing scenarios and the potential anti-spoofing techniques that can be integrated in an airborne navigation system.

In an era of high resolution gravity field modelling the dominant error sources in spacecraft orbit determination are non-conservative spacecraft surface forces, such as: Solar Radiation Pressure, antenna thrust, Earth' albedo, thermal re-radiation, etc. The conventional approach to these problems is to use an empirical blind model which absorb all the forces but this approach introduces systematic errors and limit the prediction of the orbit. In the last years several wind-box model have appeared, developed based in GPS and Glonass official information, to overcome this limitation.

In an era of high resolution gravity field modelling the dominant error sources in spacecraft orbit determination are non-conservative spacecraft surface forces, such as: Solar Radiation Pressure, antenna thrust, Earth' albedo, thermal re-radiation, etc. The conventional approach to these problems is to use an empirical blind model which absorb all the forces but this approach introduces systematic errors and limit the prediction of the orbit. In the last years several wind-box model have appeared, developed based in GPS and Glonass official information, to overcome this limitation.

The challenge of the Miniaturized transceiver design is, to design a new generation of TT&C
transceivers that can be efficiently configured and adapted to meet the requirements of a
diversity of both small and classical Hi-Rel missions. The new concept developed breadboard
validates the overall concept as well as the key new elements introduced. This activity drove a
design oriented to the new small platforms that will require this kind of products.

The activity scope is to trade-off GNSS payload architectures and technologies that would enable the main streams of GNSS payload Long Term Evolution (2020/2025):1)Signal Generation Flexibility/Re-configurability, 2)Power Control Flexibility, 3)EIRP Increase, 4)Performance improvements .A)Analyse the Galileo Signal Generation Subsystem, its requirements, performance and limitations (, e.g. technological, functional, etc.) in terms of signal generation flexibility/re-configurability.

In the long term evolution of GNSS, it is expected that new signals and innovative signal designs will be conceived to support the next-generation of GNSS applications. These future GNSS signals will require innovative protection mechanisms to enable the business models of value-added services from multiple service providers, ensuring the protection of service revenues.

SMOS has shown the importance of achieving low level of noise floor and side lobes for best image quality in aperture synthesis radiometry. One key factor is the similarity between element patterns. During the TRP study on Super-MIRAS a solution was proposed based on dummy elements. This activity includes the following tasks : - To build of a representative part of an aperture synthesis radiometer at L-band with a conventional ground plane and with the proposed dummy element technique. - To measure of the patterns of the active elements.

This study focused on the synergistic retrieval of cloud information from active and passive observations. While this synergistic approach is well established for precipitation, it is used less for clouds.