Method for determining at least one protection radius associated with at least one navigation parameter, and associated electronic determination device

A method for determining at least one protection radius associated with at least one navigation parameter of a wearer. The method includes receiving a measurement from a sensor, an error bound, and an inertial measurement. The method further includes, for each successive reception instant, determining an estimated state vector on the basis of the measurement from the sensor and the inertial measurement. The method further includes computing an estimate error propagation matrix and a bounded error influence matrix, and computing transfer matrices on the basis of the calculated matrices. The method further includes determining navigation parameters from the estimated state vector and the associated protection radius on the basis of the calculated transfer matrices.