Patent ID: 9663200
Date: 2017-05-30
CPC Classifications: B63B,G01C

Claim:
1. A navigation system for a mobile vehicle, adapted to determine and display a navigation safety zone for the mobile vehicle, the navigation system comprising: a dead reckoning navigation system adapted to produce a series of measurements of the mobile vehicle position variation over time, a calculator, a storage memory, an embedded sensor on-board the mobile vehicle to acquire a series of measurements of an environmental parameter as a function of time; an electronic mapping system comprising a display device and connected to a reference geographical data base of the environmental parameter, the electronic mapping system allowing to determine for each point of a geographical map the reference value of the environmental parameter, the calculator being connected to the storage memory, to the geographical data base, to the dead reckoning navigation system and to the electronic mapping system, wherein: the calculator is adapted to calculate the probability density of presence of the mobile vehicle around each point of the map at each instant t, based on the series of position variation measurements of the dead reckoning navigation system, on the series of measurements of the environmental parameter, and on the reference geographical data base of the environmental parameter, to deduce there from a safety zone corresponding to a presence probability higher than or equal to a predetermined threshold p, the electronic mapping system being adapted to represent said safety zone on the display device.