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Millimeter wave image processing system and method

A millimetre wave image processing system and method comprises analogue to digital signal conversion 9 of received radio signals and performing correlation processing 11a on the said signals. Also included is generating a theoretical received signal for a target positioned at a focused distance in the field of view, within an imaging processor 13, so as to provide a reference signal for each pixel and further correlating the correlation processing output signal with the said reference signal to generate an image of the target 15. The radio signals may be received by a T-shaped antenna array 2 or by antenna elements moved horizontally and vertically in a linear manner so as to form a T-shape. Matching and filtering steps may also be used in the generation of an image of the target 15. A calibration process 5 may be used to provide phase corrections which may be used to compensate for distortions arising in the signals received. The image processing system may be used to derive accurate images of a target located at different ranges from an antenna array 2. The said ranges may be within the near field of the antenna array 2 and may take into account the spherical wave front provided by a target located in the near field.