Systems for surveillance using airborne platforms as receiving platforms for bistatic radars
First Claim
1. A system comprising:
- a first mobile airborne platform hovering over or close to a coverage area on earth surface or near the earth surface, the first mobile airborne platform comprising a bistatic radar receiver including a first antenna system to capture first radiofrequency signals originated from a first satellite, the captured first radiofrequency signals including first radiation signals captured via a first direct path from the first satellite and first reflected radiation signals captured via first reflected paths from the coverage area, and second radiofrequency signals originated from a second satellite, the captured second radiofrequency signals including second radiation signals captured via a second direct path from the second satellite and second reflected radiation signals captured via second reflected paths from the coverage area, the first mobile airborne platform transmitting the captured first and second radiofrequency signals to a ground hub via a feeder link; and
the ground hub comprising;
a remote beam forming network to remotely form receiving beams for the first antenna system of the bistatic radar receiver to capture the first and second radiofrequency signals; and
a remote radar processing center to transform the captured first radiofrequency signals into a first two-dimensional radiofrequency image, and to transform the captured second radiofrequency signals into a second two-dimensional radiofrequency image.
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Abstract
A system includes a ground hub and a mobile airborne platform hovering over or close to a coverage area on or near the earth surface. The mobile airborne platform comprises a bistatic radar receiver including an antenna system to capture first radiofrequency signals originated from a first satellite and second radiofrequency signals originated from a second satellite, via direct paths and via reflected paths from the coverage area. The mobile airborne platform transmits the captured first and second radiofrequency signals to a ground hub via a feeder link. The ground hub includes a remote beam forming network to remotely form receiving beams for the antenna system of the bistatic radar receiver to capture the first and second radiofrequency signals, and a remote radar processing center to transform the captured first and second radiofrequency signals into a first and a second two-dimensional radiofrequency image, respectively.
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Citations
20 Claims
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1. A system comprising:
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a first mobile airborne platform hovering over or close to a coverage area on earth surface or near the earth surface, the first mobile airborne platform comprising a bistatic radar receiver including a first antenna system to capture first radiofrequency signals originated from a first satellite, the captured first radiofrequency signals including first radiation signals captured via a first direct path from the first satellite and first reflected radiation signals captured via first reflected paths from the coverage area, and second radiofrequency signals originated from a second satellite, the captured second radiofrequency signals including second radiation signals captured via a second direct path from the second satellite and second reflected radiation signals captured via second reflected paths from the coverage area, the first mobile airborne platform transmitting the captured first and second radiofrequency signals to a ground hub via a feeder link; and the ground hub comprising; a remote beam forming network to remotely form receiving beams for the first antenna system of the bistatic radar receiver to capture the first and second radiofrequency signals; and a remote radar processing center to transform the captured first radiofrequency signals into a first two-dimensional radiofrequency image, and to transform the captured second radiofrequency signals into a second two-dimensional radiofrequency image. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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15. A system comprising:
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a set of mobile airborne platforms hovering over or close to a coverage area on earth surface or near the earth surface, each of the mobile airborne platforms comprising a bistatic radar receiver including a first antenna system to capture first radiofrequency signals originated from a first satellite, the captured first radiofrequency signals including first radiation signals captured via a first direct path from the first satellite and first reflected radiation signals captured via first reflected paths from the coverage area, and second radiofrequency signals originated from a second satellite, the captured second radiofrequency signals including second radiation signals captured via a second direct path from the second satellite and second reflected radiation signals captured via second reflected paths from the coverage area, each of the mobile airborne platforms transmitting the respective captured first and second radiofrequency signals to a ground hub via a respective feeder link; and the ground hub comprising; a remote beam forming network to remotely form receiving beams for each of the first antenna systems to capture the respective first and second radiofrequency signals; and a remote radar processing center to transform the captured respective first radiofrequency signals into respective first two-dimensional radiofrequency images, and to transform the captured respective second radiofrequency signals into respective second two-dimensional radiofrequency images. - View Dependent Claims (16, 17, 18, 19, 20)
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Specification