METHOD FOR ESTIMATING ERRORS POSITION AND SPEED OF AN INERTIAL PLATFORM USING RADAR WITH IMAGING SAR

摘要

The subject of the invention is a method for determining the position error and the speed bias of an inertial unit on board a carrier pursuing a trajectory towards a target, characterized in that it further comprises the steps following: - the acquisition on board of the carrier of a series of SAR-type images of the target, - the exploitation of said images to measure from each of the images a measurement of the distance and a Doppler measurement of the target - the estimation of the precise position of the carrier with respect to the target and the speed error (corresponding to a bias over a short duration), from the distance and Doppler measurements of the target with a filter estimator The invention may also comprise a step of determining the shape of the trajectory which optimizes the performance of the estimator filter. The fields of application of the invention are: precise guidance of a missile on a fixed target from of a seeker SAR "Synthetic Aperture Radar" .- the registration of the inertial unit of an aircraft carrying a SAR radar "Synthetic Aperture Radar".