Patent ID: 6114975
Filing Date: 2000-09-05
Classification: G01S,G05D,G08G

Abstract:
Process for aiding the piloting of a hunter towards a mobile target, using a first satellite-based positioning receiver associated with the target to provide position and velocity measurements tied to the position and to the velocity of the target, a second satellite-based positioning receiver associated with the hunter to provide position and velocity measurements tied to the position and to the velocity of the hunter, and using a radio transmission device configured to transmit information from the target to the hunter, said process comprising:periodically transmitting from the target to the hunter, measurements of pseudo-distances representing the distance of the target from n different satellites at a given instant, the identification of these n satellites, a value of the instant of the measurement, measurements of relative pseudo-velocities between the target and each satellite;performing, in the second receiver, periodic measurements of pseudo-distances representing the distance of the target from plural satellites at a given instant, a value of the instant of the measurement, and measurements of pseudo-velocities between the hunter and each of said plural satellites;determining in the hunter, which satellites am used both by the hunter and by the target, the number of these satellites being p which is less than or equal to n;subtracting the pseudo-distances and pseudo-velocities determined by the hunter and those received from the target for each of the p satellites; anddirectly from the results of said subtractions, calculating relative position and velocity vectors, in relation to a terrestrial reference marker, between the hunter and a point tied to the target.