Method and system for millimeter-wave image reconstruction
First Claim
Patent Images
1. Method for reconstructing an image of an object, the object positioned adjacent a reflecting surface, comprising the steps of:
- illuminating the object by transmitting millimeter-wave and/or micrometer-wave radiation from an array of transmitting antennas;
detecting signals of radiation reflected by the object with an array of receiving antennas and representing the detected signals by complex-numbered measurement data;
performing coherent processing of the measurement data by a first component of a central processing unit or a local processing unit including complex number computations for image reconstruction;
establishing Tx subgroups of transmitting antennas for which coherent processing is performed by the local processing unit to achieve coherent subimages, whereby the Tx subgroup comprises one or more virtual transmission antennas or virtual Tx clusters resulting from the reflecting surface;
establishing Rx subgroups of the receiving antennas, whereby the receiving antennas of each TX subgroup are located in or near the transmitting antennas of the associated TX subgroup and are configured to detect signals of radiation transmitted from the transmitting antennas of any associated Tx subgroup;
calculating magnitude values by a second component in the central processing unit each indicative of a magnitude of a complex number to obtain a magnitude subimage for each of the coherent subimages and generating the object image by adding the magnitude subimages; and
implementing multiple Tx clusters as a sparse array.
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Abstract
The invention relates to a technique for millimeter-wave active image reconstruction. According to a method aspect, Tx subgroups of transmitting antennas of an antenna array are established. Coherent processing of measurement data is performed for each Tx subgroup and coherent subimages are achieved. Magnitudes of complex numbers are calculated to obtain a magnitude subimage for each of the coherent subimages and an object image is generated by adding the magnitude subimages.
14 Citations
15 Claims
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1. Method for reconstructing an image of an object, the object positioned adjacent a reflecting surface, comprising the steps of:
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illuminating the object by transmitting millimeter-wave and/or micrometer-wave radiation from an array of transmitting antennas; detecting signals of radiation reflected by the object with an array of receiving antennas and representing the detected signals by complex-numbered measurement data; performing coherent processing of the measurement data by a first component of a central processing unit or a local processing unit including complex number computations for image reconstruction; establishing Tx subgroups of transmitting antennas for which coherent processing is performed by the local processing unit to achieve coherent subimages, whereby the Tx subgroup comprises one or more virtual transmission antennas or virtual Tx clusters resulting from the reflecting surface; establishing Rx subgroups of the receiving antennas, whereby the receiving antennas of each TX subgroup are located in or near the transmitting antennas of the associated TX subgroup and are configured to detect signals of radiation transmitted from the transmitting antennas of any associated Tx subgroup; calculating magnitude values by a second component in the central processing unit each indicative of a magnitude of a complex number to obtain a magnitude subimage for each of the coherent subimages and generating the object image by adding the magnitude subimages; and implementing multiple Tx clusters as a sparse array. - View Dependent Claims (2, 3, 4)
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5. A system for reconstructing an image of an object, comprising:
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an array of transmitting antennas adapted to illuminate the object by transmitting millimeter-wave and/or micrometer-wave radiation; an array of receiving antennas adapted to detect signals of radiation reflected by the object; a reflecting surface positioned adjacent the object; at least one component adapted to represent the detected signals by complex-numbered measurement data; at least one component adapted to perform coherent processing of the measurement data including complex number computations for image reconstruction; at least one component adapted to establish Tx subgroups of transmitting antennas for which coherent processing is performed to achieve coherent subimages and adapted to establish Rx subgroups of the receiving antennas, whereby the receiving antennas of each Tx subgroup are located in or near the transmitting antenna of the associated Tx subgroup and are limited to configure signals of radiation transmitted from the transmitting antennas of any associated Tx subgroup, and whereby the Tx subgroup comprises one or more virtual transmission antennas or virtual Tx clusters resulting from the reflecting surface; at least one component adapted to calculate magnitude values each indicative of a magnitude of a complex number to obtain a magnitude subimage for each of the coherent subimages and to generate the object image by adding the magnitude subimages; and multiple Tx clusters are implemented as a sparse array. - View Dependent Claims (6, 7, 8, 9, 10, 11, 12, 13, 14)
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15. A computer program comprising program code portions for performing the steps of:
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illuminating an object by transmitting millimeter-wave and/or micrometer-wave radiation from an array of transmitting antennas, the object positioned adjacent a reflecting surface; detecting signals of radiation reflected by the object with an array of receiving antennas and representing the detected signals by complex-numbered measurement data; performing coherent processing of the measurement data including complex number computations for image reconstruct ion; establishing Tx subgroups of transmitting antennas for which coherent processing is performed to achieve coherent subimages, whereby the Tx subgroup comprises one or more virtual transmission antennas or virtual Tx clusters resulting from the reflecting surface; establishing Rx subgroups of the receiving antennas, whereby the receiving antennas of each TX subgroup are located in or near the transmitting antennas of the associated TX subgroup and are configured to detect signals of radiation transmitted from the transmitting antennas of any associated Tx subgroup; calculating magnitude values each indicative of a magnitude of a complex number to obtain a magnitude subimage for each of the coherent subimages and generating the object image by adding the magnitude subimages; and implementing multiple Tx clusters as a sparse array.
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Specification