Device and method for maintaining reliability of the positioning of a vehicle irrespective of the vulnerability of satellite data

A device (10) for maintaining reliability of positioning of a vehicle irrespective of vulnerability of satellite data, carried on-board a vehicle moving between two distinct geographical positions, the device comprising:

• an inertial measurement unit providing navigation measurements;
• a receiver of satellite positioning data;
• a closed-loop main Kalman filter calculating navigation data corrections by continuous hybridization of satellite positioning data provided by said receiver and non-satellite positioning data provided by at least said inertial measurement unit;
• and
• a bank of Kalman sub-filters in parallel, each Kalman sub-filter:
• calculating navigation data corrections by intermittent hybridization, according to a resetting frequency comprised within a predetermined frequency range, of satellite positioning data provided by said receiver and non-satellite positioning data provided at least by said inertial measurement unit, the resetting frequency being distinct from one sub-filter to another, and
• outside the implementation of the intermittent hybridization, calculating navigation data corrections solely from the non-satellite positioning data provided by at least said inertial measurement unit.