Method and system for mutual coherent synthetic aperture radiometry
First Claim
1. A system for imaging a target, the system comprising:
- a first antenna configured to receive from an imaging target a first signal occupying a first bandwidth including substantially more than one frequency;
a second antenna configured to receive from the imaging target a second signal occupying a second bandwidth including substantially more than one frequency and to perform a spatial movement relative to the first antenna, the spatial movement being associated with a synthetic aperture;
a cross correlation receiver coupled to the first antenna and the second antenna, the cross correlation receiver configured to;
process information associated with the first signal and the second signal;
determine a cross correlation function based on at least information associated with the first signal and the second signal;
wherein the cross correlation function is dependent upon at least a time interval between a first time when the first antenna receiving the first signal and a second time when the second antenna receiving the second signal;
wherein the cross correlation function is associated with the synthetic aperture;
a processing system coupled to the cross correlation receiver and configured to;
determine a radial down range profile of the imaging target based on at least information associated with the cross correlation function;
perform a phase compensation to the radial down range profile;
form an image of the imaging target based on at least information associated with the phase-compensated radial down range profile;
wherein the form an image of the imaging target uses at least an synthetic aperture imaging algorithm.
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Abstract
Method and system for synthetic aperture radiometry not limited by the Van Cittert-Zernike theorem and the quasi-monochromatic assumption. A radiometer system (300) for imaging the emissions from a distribution of incoherent emission sources located within a target area comprising a first antenna (322) configured to receive a first signal (326) emitted primarily from a target area, and a second antenna (324) configured to receive a second signal (327) emitted primarily from the target area. The first and second antennas may be located at approximately the same distance from the target area (310) or at substantially different distances from the target area (310). The radiometer system (300) is configured to allow the second antenna (324) to move faster than the first antenna (322) with respect to the target area (310), with the second antenna (324) moving along a pre-determined trajectory corresponding to a synthetic aperture (430). A cross correlation receiver (330) computes a plurality of cross correlation functions as based on all relevant relative time delays between the first signal (326) and the second signal (327). The image processor (340) converts computed correlation data (332) into a plurality of complex valued radial down range profiles of the target area and further computes an image of the target area based on synthetic aperture image processing principle.
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Citations
32 Claims
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1. A system for imaging a target, the system comprising:
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a first antenna configured to receive from an imaging target a first signal occupying a first bandwidth including substantially more than one frequency;
a second antenna configured to receive from the imaging target a second signal occupying a second bandwidth including substantially more than one frequency and to perform a spatial movement relative to the first antenna, the spatial movement being associated with a synthetic aperture;
a cross correlation receiver coupled to the first antenna and the second antenna, the cross correlation receiver configured to;
process information associated with the first signal and the second signal;
determine a cross correlation function based on at least information associated with the first signal and the second signal;
wherein the cross correlation function is dependent upon at least a time interval between a first time when the first antenna receiving the first signal and a second time when the second antenna receiving the second signal;
wherein the cross correlation function is associated with the synthetic aperture;
a processing system coupled to the cross correlation receiver and configured to;
determine a radial down range profile of the imaging target based on at least information associated with the cross correlation function;
perform a phase compensation to the radial down range profile;
form an image of the imaging target based on at least information associated with the phase-compensated radial down range profile;
wherein the form an image of the imaging target uses at least an synthetic aperture imaging algorithm. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32)
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Specification