Method for determining the trajectory of a mobile object, characterized in that it includes: - the provision of a mobile object including a first sensor and a second sensor mechanically interconnected and configured to measure at least one same physical parameter at different points of said object; - the movement of said first and second sensors along the same trajectory, there remaining between said first and second sensors a distance D that is constant to within 2% during the movement, the distance D being defined as the curvilinear abscissa separating said first and second sensors measured along said trajectory; - the measurement during the movement of said at least one same physical parameter by said first and second sensors, said physical parameter being chosen in the group comprising a luminous intensity, a magnetic field, the acceleration due to gravity, the electromagnetic field, a temperature, an atmospheric pressure, a flight time, an image, an acoustic field, a seismic field or an acceleration; - the determination of the times, termed reference times (t), for which the mobile object has traveled a cumulative curvilinear distance along said trajectory that is equal to an integer multiple of the distance D, this determination including, for said measured at least one same physical parameter, seeking a correlation between the temporal evolution of the respective physical parameter measured by each of said first and second sensors; - the calculation of a direction tangential to the trajectory of the object at the level of the same first or second sensor for each of the instants t so determined; - the automatic reconstruction of the trajectory followed by the mobile object during its movement by means of an interpolation and on the basis, for each reference time so determined: • of the cumulative curvilinear distance along the trajectory at that reference time, and • of said tangent calculated for that reference time. - the provision of a mobile object including a first sensor and a second sensor mechanically interconnected and configured to measure at least one same physical parameter at different points of said object; - the movement of said first and second sensors along the same trajectory, there remaining between said first and second sensors a distance D that is constant to within 2% during the movement, the distance D being defined as the curvilinear abscissa separating said first and second sensors measured along said trajectory; - the measurement during the movement of said at least one same physical parameter by said first and second sensors, said physical parameter being chosen in the group comprising a luminous intensity, a magnetic field, the acceleration due to gravity, the electromagnetic field, a temperature, an atmospheric pressure, a flight time, an image, an acoustic field, a seismic field or an acceleration; - the determination of the times, termed reference times (t), for which the mobile object has traveled a cumulative curvilinear distance along said trajectory that is equal to an integer multiple of the distance D, this determination including, for said measured at least one same physical parameter, seeking a correlation between the temporal evolution of the respective physical parameter measured by each of said first and second sensors; - the calculation of a direction tangential to the trajectory of the object at the level of the same first or second sensor for each of the instants t so determined; - the automatic reconstruction of the trajectory followed by the mobile object during its movement by means of an interpolation and on the basis, for each reference time so determined: • of the cumulative curvilinear distance along the trajectory at that reference time, and • of said tangent calculated for that reference time. • of the cumulative curvilinear distance along the trajectory at that reference time, and • of said tangent calculated for that reference time.