Objective of RIGOUR (Real-time Integrity for GNSS using OpportUnistic Receivers) is the Demonstration of the feasibility and a quantification of the benefits (with respect to existing Integrity systems) of “Real-time big data processing for GNSS Integrity”, using large-scale simulations.
Taking this into account, the proposed activity aims to assess new GNSS integrity concepts, namely:
•        Satellite integrity: Massive use of general GNSS user terminals as main source of input data to generate satellite integrity information from a GNSS Integrity Processor, with no or a reduced number of System reference stations.
•        Local integrity: Provision of additional information for a given small area (e.g. a street) with high density of GNSS users feeding data in the System so that it is possible to increase, if needed, the protection levels to cover the impact of the GNSS local environment (multipath, interference) without jeopardising the availability in other regions.

This approach has merit because worse input data can be largely compensated by the sheer amount of samples. In the case of the local integrity, there is no doubt that the use of massive data from a small region might contribute to enlighten the observability of local events.
Another advantage of the proposed scheme is the increase in the geometrical visibility of the system internal state, thanks to the extensive geographical coverage of the terminals.
In this concept, the GNSS regular users take a dual role: they might feed the System with input data (contributors), and they might receive the System outcome to get integer overbounding for given GNSS environments. The fact that there might be a high density of users in a given area is the basis for the provision of a local integrity service on top of the global one. There are different approaches for this service: the global integrity might be designed to cover users in any environment and then the local integrity would provide smaller protection levels, or the global integrity might be given in clean or mild environments, and the local integrity increases the protection levels for a given area.