Moving-entity detection
First Claim
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1. A method of sensing moving entities, the method comprising:
- transmitting a stepped-frequency radar signal including a plurality of frequencies through a wall from a first side of the wall to a second side of the wall;
receiving reflected portions of the radar signal with a first antenna arranged to receive signals reflected by the first side of the wall and a second antenna arranged to have a field of view opposite the first antenna;
processing the reflected portions received from the first and second antennas to generate processed data including information associated with frequency shifts between the transmitted signal and the reflected portions of the radar signal received from the first antenna; and
analyzing the processed data to determine if reflected portions are associated with moving entities located beyond the second side of the wall, the analyzing including differentiating reflected portions of the radar signal received from the first antenna from reflected portions of the radar signal received from the second antenna.
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Abstract
Sensing moving entities includes transmitting a stepped-frequency radar signal including multiple frequencies through a wall from a first side of the wall to a second side of the wall. Portions of the radar signal that are reflected by entities located beyond the second side of the wall are detected. The reflected portions are processed to generate processed data including information associated with frequency shifts between the transmitted signal and the detected signal. The processed data is analyzed to determine if reflected portions are associated with moving entities.
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Citations
22 Claims
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1. A method of sensing moving entities, the method comprising:
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transmitting a stepped-frequency radar signal including a plurality of frequencies through a wall from a first side of the wall to a second side of the wall; receiving reflected portions of the radar signal with a first antenna arranged to receive signals reflected by the first side of the wall and a second antenna arranged to have a field of view opposite the first antenna; processing the reflected portions received from the first and second antennas to generate processed data including information associated with frequency shifts between the transmitted signal and the reflected portions of the radar signal received from the first antenna; and analyzing the processed data to determine if reflected portions are associated with moving entities located beyond the second side of the wall, the analyzing including differentiating reflected portions of the radar signal received from the first antenna from reflected portions of the radar signal received from the second antenna. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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14. A system for sensing moving entities, the system comprising:
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a stepped-frequency radar transmitter coupled to a transmit antenna to transmit a stepped-frequency radar signal; a first antenna configured to detect portions of the radar signal reflected by a side of a wall on which the system is located; a second antenna arranged to have a field of view opposite the first antenna and configured to detect reflected portions of the radar signal; and a processor operable to process, for a plurality of frequencies, the reflected portion of the radar signal from the first and second antennas, and to analyze the processed data to determine the presence of moving entities, the analyzing including differentiating reflected portions of the radar signal received from the first antenna from reflected portions of the radar signal received from the second antenna, wherein the system is configured to determine the presence of moving entities on an opposite side of the wall from the side of the wall on which the system is located. - View Dependent Claims (15, 16, 17, 18, 19, 20, 21, 22)
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Specification