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Patent Number: |
7504984 |
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Case ID: |
0 |
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Patent Title:
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Large scale imaging with spatially-coded waveforms
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Status: |
ACTIVE |
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Status Date: |
2/3/2010 1:56:47 PM |
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Issue Date:
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3/17/2009 |
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Filed Date:
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5/15/2007 |
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Serial #:
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1/803,813 |
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Assignee Name:
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The United States of America as represented by the Secretary of the Air Force
(Washington,
DC)
N/A
(
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Inventor(s):
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Mitra, Atindra K. |
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BACKGROUND OF THE
INVENTION
Adversaries have developed sophisticated tools for hiding underground and in spaces below ground level and in buildings. They have further developed techniques that help them hide from density searches and infrared.
Previous work in this area position-adaptive radar includes Atindra K. Mitra and Krishna M. Pasala, "Low-Cost position-Adaptive Unmanned Aviation Vehicle (UAV) Radar Design with State-of-the-Art COTS Technology," Radar Sensor Technology X, DSS
2004 and Atindra K. Mitra, "Leakage Signal Analysis for Position-Adaptive UAV Radar Applications," Radar Sensor Technology XI, DSS 2005, both incorporated herein by reference. These articles have addressed topics such as short-range monostatic
position-adaptive radar design for mini-unmanned aviation vehicle helicopter platforms as well as electromagnetic phenomenology and associated signal processing for position-adaptive radar. Some of these position-adaptive radar designs are based on
. . . . More |
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A system for locating earth cavities, or items in a building, or
structural characteristics having a plurality of transmitters that
generate at least a portion of a waveform. Each transmitter divides the
waveform into sub-chirp intervals and transmits a known sub-chirp
interval from a known location to contact an article of interest. The
resulting sub-chirp intervals become a leakage signal that is then
received and processed by a receiver. The receiver therein approximates a
cavity size, article size, article composition, article location, earth
cavity location, or other structural characteristic.
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What is claimed is:
1. A system for locating earth cavities comprising: a plurality of satellites based transmitters that generate a waveform; each transmitter dividing the wave form into
sub-chirp intervals; each transmitter transmitting a known sub-chirp interval from a known location to contact the earth, the resulting sub-chirp interval becoming a leakage signal; and at least one receiver, the receiver processing the plurality of
leakage signals to approximate the earth cavity size, and location.
2. The system of claim 1 wherein the frequency waveform is from about 300 MHz to about 12 GHz.
3. The system of claim 1 wherein the receiver is located on a land vehicle or aircraft.
4. The system of claim 1 wherein the sub-chirp interval is from about 500 MHz to about 2,000 MHz and there are at least 3 sub-chirp intervals.
5. The system of claim 1 further including a means for extrapolating the plurality of the leakage signals to image t . . . . More |
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