System and method for imaging objects
First Claim
1. An active imaging system for imaging a target, the system comprising:
- a transmitting unit configured to generate electromagnetic radiation signal in microwave wave frequency range for scanning the target;
a receiving unit configured to receive microwave radiation re-radiated from the target;
an antenna arrangement coupled to said transmitting unit and said receiving unit via a front end unit, and configured for transmitting and receiving electromagnetic radiation signal in the microwave wave frequency range, wherein said antenna arrangement includes a sparse array of unitary antennas operating for receiving and transmitting the electromagnetic radiation and including a plurality of antenna elements forming a synthetic antenna configured for rotating about an axis passing through a phase center of said synthetic antenna and orthogonal to a plane of the sparse array so as to fill in an aperture of said synthetic antenna;
wherein the antenna arrangement comprises a rotating arm including;
an electromagnetic circular waveguide connected to the front-end unit,a quasi-optical transition element connected to the electromagnetic circular waveguide for providing quasi-optical to electromagnetic waveguide transition,a quasi-optical waveguide rotary joint, anda quasi-optical waveguide connected to the quasi-optical waveguide rotary joint at one end of the quasi-optical waveguide;
thereby forming a rotating antenna by allowing the electromagnetic wave to enter or to exit the quasi-optical waveguide directly through an outer end of the quasi-optical waveguide;
an image processing unit coupled to the receiving unit and preprogrammed by a mathematical model configured for analyzing received electromagnetic radiation signal and creating an image of at least one object located within the target by employing an imaging algorithm which includes synthetic aperture processing; and
a control system coupled to at least one of the following units;
said transmitting unit, said receiving unit and said image processing unit; and
configured for controlling operation thereof.
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Accused Products
Abstract
An active imaging system for imaging a target is described. The system includes a transmitting unit, a receiving unit, an antenna arrangement coupled to the transmitting unit and/or the receiving unit via a front end unit, and an image processing unit coupled to the receiving unit. The system also includes a control system coupled to the transmitting unit, the receiving unit and/or the image processing unit for controlling operation thereof. The antenna arrangement includes at least one rotating antenna synthetically forming a circular antenna. The image processing unit is configured for creating an image of the object by employing a synthetic aperture radar imaging algorithm.
67 Citations
11 Claims
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1. An active imaging system for imaging a target, the system comprising:
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a transmitting unit configured to generate electromagnetic radiation signal in microwave wave frequency range for scanning the target; a receiving unit configured to receive microwave radiation re-radiated from the target; an antenna arrangement coupled to said transmitting unit and said receiving unit via a front end unit, and configured for transmitting and receiving electromagnetic radiation signal in the microwave wave frequency range, wherein said antenna arrangement includes a sparse array of unitary antennas operating for receiving and transmitting the electromagnetic radiation and including a plurality of antenna elements forming a synthetic antenna configured for rotating about an axis passing through a phase center of said synthetic antenna and orthogonal to a plane of the sparse array so as to fill in an aperture of said synthetic antenna; wherein the antenna arrangement comprises a rotating arm including; an electromagnetic circular waveguide connected to the front-end unit, a quasi-optical transition element connected to the electromagnetic circular waveguide for providing quasi-optical to electromagnetic waveguide transition, a quasi-optical waveguide rotary joint, and a quasi-optical waveguide connected to the quasi-optical waveguide rotary joint at one end of the quasi-optical waveguide; thereby forming a rotating antenna by allowing the electromagnetic wave to enter or to exit the quasi-optical waveguide directly through an outer end of the quasi-optical waveguide; an image processing unit coupled to the receiving unit and preprogrammed by a mathematical model configured for analyzing received electromagnetic radiation signal and creating an image of at least one object located within the target by employing an imaging algorithm which includes synthetic aperture processing; and a control system coupled to at least one of the following units;
said transmitting unit, said receiving unit and said image processing unit; and
configured for controlling operation thereof. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. An active imaging system for imaging a target, the system comprising:
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a transmitting unit configured to generate electromagnetic radiation signal in microwave wave frequency range for scanning the target; a receiving unit configured to receive microwave radiation re-radiated from the target; an antenna arrangement coupled to said transmitting unit and said receiving unit via a front end unit, and configured for transmitting and receiving electromagnetic radiation signal in the microwave wave frequency range, wherein said antenna arrangement includes a sparse array of unitary antennas operating for receiving and transmitting the electromagnetic radiation and including a plurality of antenna elements forming a synthetic antenna configured for rotating about an axis passing through a phase center of said synthetic antenna and orthogonal to a plane of the sparse array so as to fill in an aperture of said synthetic antenna; wherein the antenna arrangement includes a plurality of rotating receiving antennas distributed on a disk, and at least one stationary transmitting antenna arranged in the vicinity to the receiving antennas at a distance from the center of rotation of the disk larger than the radius of the disk; an image processing unit coupled to the receiving unit and preprogrammed by a mathematical model configured for analyzing received electromagnetic radiation signal and creating an image of at least one object located within the target by employing an imaging algorithm which includes synthetic aperture processing; and a control system coupled to at least one of the following units;
said transmitting unit, said receiving unit and said image processing unit; and
configured for controlling operation thereof. - View Dependent Claims (9, 11)
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10. An active imaging system for imaging a target, the system comprising:
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a transmitting unit configured to generate electromagnetic radiation signal in microwave wave frequency range for scanning the target; a receiving unit configured to receive microwave radiation re-radiated from the target; an antenna arrangement coupled to said transmitting unit and said receiving unit via a front end unit, and configured for transmitting and receiving electromagnetic radiation signal in the microwave wave frequency range, wherein said antenna arrangement includes a sparse array of unitary antennas operating for receiving and transmitting the electromagnetic radiation and including a plurality of antenna elements forming a synthetic antenna configured for rotating about an axis passing through a phase center of said synthetic antenna and orthogonal to a plane of the sparse array so as to fill in an aperture of said synthetic antenna; wherein the antenna arrangement includes a plurality of rotating receiving antennas distributed on a disk, and at least one stationary transmitting antenna arranged ahead of the rotating disk at a distance from the axis of rotation shorter than the radius of the disk; an image processing unit coupled to the receiving unit and preprogrammed by a mathematical model configured for analyzing received electromagnetic radiation signal and creating an image of at least one object located within the target by employing an imaging algorithm which includes synthetic aperture processing; and a control system coupled to at least one of the following units;
said transmitting unit, said receiving unit and said image processing unit; and
configured for controlling operation thereof.
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Specification