This activity will be investigating the specific issue of the provision of integrity for terrestrial users by RX digital signal processing techniques.Future systems will have to support the growing demand for more complex services. In particular Navigation systems may likely provide integrity also for terrestrial users. Numerous integrity barriers can be developed at RX digital signal processing level

Provision of integrity in harsh terrestrial environment is very difficult due to the increasing rate of failure induced by the local effects. Analysis of these events shall be performed together with the possible countermeasure and detection mechanism in order to minimise the integrity impact maximising service availability and continuity. Ground Integrity Channel as EGNOS and GALILEO will only cover the system events so usage of local solutions is mandatory to cope with the local threats. Several options can be considered, and amongst them, techniques based on Integrity Barriers at Digital Signal Processing level (IB-DSP). The activity will: 1. Analyze the impact of challenging user environmental conditions on the tracking loops2. Analyze (function definition and performance) IB-DSP techniques against multipath 3. Analyze (function definition and performance) IB-DSP techniques against interference 4. Analyze (function definition and performance) IB-DSP techniques against false lock5. Analyze (function definition and performance) IB-DSP techniques against non line of sight tracking6. Analyze the IB-DSP error distributions (including over-bounding) in controlled realistic conditions7. For information compare the IB-DSP techniques against conventional RAIM-like techniques