Method for passive localization of a target and air-air localization in particular
AssigneeThales
InventorStephane Paquelet
Life of this patent
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Abstract
This invention concerns a method for passive localization of a target (12) and air-air localization in particular. This method includes a step for acquisition of the signal transmitted by the target using sensors equipping the carrier (11) and forming two interferometers. This step includes at least two independent measurement series carried out along separate trajectories. The method also includes a measurement processing step to estimate the parameters characterizing the target easily. The invention applies in particular to the passive localization of a target whose transmission frequency varies in a narrow band.
Claims11
Method for the localization of a target, wherein the target transmitting a signal and this signal being acquired by detection means equipping a carrier, this method comprises at least two steps:
- A measurement acquisition step, comprising at least two independent sequences for acquisition of the signal transmitted by the target, each sequence being used to obtain a series of measurements, the carrier following during each sequence a separate trajectory, with a non zero angle between the trajectories (31 and 32).
- A measurement processing step involving statistical processing carried out on each measurement series, this processing being used to determine the target parameters.
Method according to any of the previous claims, wherein the acquisition is carried out using sensors arranged along the axis of the carrier or perpendicular to this axis, these sensors being grouped to form large and small base interferometers.
Method according to any of the previous claims, wherein the statistical processing employed tries to find the values of the target parameters which minimize a statistical resemblance criterion C(Θ).
Method according to any of the previous claims, wherein the processing step uses the statistical processing twice, the first time to obtain a quick estimation using measurements taken during each of the sequences, the second time to improve the results around the first estimation, this improvement including all measurements available.
Dependencies are inferred from the claim text.