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US 12,693,377 B1Granted
Radar detection filtering approach
AssigneeAmazon Technologies, Inc.
InventorsCornel Bumb, Marius Olaru, Lucian Ungurean, Gabriel Carstoiu
Life of this patent
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Abstract
Technology directed to a radar detection filtering approach is described. Processing logic obtains radar data from a radar unit. The processing logic determines, based on the radar data, that a candidate detection event has occurred. The processing logic determines signal characteristics of the candidate detection event. A confidence score is generated using the signal characteristics. The confidence score is compared to a confidence threshold, and in response to the confidence score satisfying the confidence threshold, a process to capture image(s) or video is activated.
Claims18
A method comprising:
- receiving, by a processor from a radar unit, radar data comprising a plurality of values, each value corresponding to one of a plurality of distance bins, wherein each value represents a magnitude of radar returns corresponding to a frequency chirp emitted by the radar unit, wherein each distance bin corresponds to a discrete distance from the radar unit;
- determining, by the processor based on the radar data, that a candidate detection event has occurred;
- generating, by the processor responsive to determining that the candidate detection event has occurred, a confidence score using signal characteristics of the radar data, the confidence score representing a level of certainty that the candidate detection event comprises actual motion of an object, wherein generating the confidence score using the signal characteristics comprises:
- identifying a first value of a first distance bin of the plurality of distance bins, wherein the first value is a first peak of the plurality of values;
- identifying a second value of a second distance bin of the plurality of distance bins, wherein the second value is a second peak of the plurality of values lower than the first peak;
- determining a first score by generating a ratio between the first value to the second value;
- identifying a reference distance bin corresponding to a third distance bin of the plurality of distance bins;
- determining a second score based on subtracting a first distance corresponding to the first distance bin from a second distance corresponding to the reference distance bin;
- identifying a third value of a fourth distance bin of the plurality of distance bins, wherein the third value is a third peak of the plurality of values, and wherein the third value is lower than the first value and higher than the second value;
- determining a third score based on subtracting an average of the first distance and a fourth distance corresponding to the fourth distance bin from the second distance;
- identifying a subset of the plurality of distance bins, wherein each distance that corresponds to a distance bin of the subset is within a pre-determined range of distances comprising the second distance;
- determining a fourth score based on a count of the values corresponding to one of the subset of the plurality of distance bins which meet a dynamic threshold;
- and
- combining the first, second, third, and fourth scores based on a weighted sum to obtain the confidence score;
- determining that the confidence score satisfies a confidence threshold, the confidence threshold representing a minimum level of certainty that the candidate detection event comprises actual motion of an object;
- and
- activating a process to capture video in response to the confidence score satisfying the confidence threshold.
14 more elements
A method comprising:
- obtaining radar data from a radar unit;
- determining, based on the radar data, that a candidate detection event has occurred;
- determining signal characteristics of the candidate detection event, wherein the signal characteristics comprise a plurality of values;
- identifying a first value of the plurality of values and a second value of the plurality of values, wherein the second value is greater than a subset of the plurality of values and the first value is greater than the second value;
- generating a confidence score using the signal characteristics and based on a ratio between the first value and the second value;
- determining that the confidence score satisfies a confidence threshold, the confidence threshold indicating a confidence that the candidate detection event is an actual detection event;
- and
- activating a process to capture one or more of an image or video in response to the confidence score satisfying the confidence threshold.
5 more elements
A device comprising:
- a radar unit;
- a camera;
- a memory device to store radar data, wherein the radar data comprises signal characteristics of radar returns observed by the radar unit, wherein the signal characteristics comprise a plurality of values;
- and
- a processor coupled to the memory device, wherein the memory device stores processor executable instructions which, when executed using the processor, cause the device to perform operations comprising:
- determining, based on the radar data, that a candidate detection event has occurred;
- identify a first value of the plurality of values and a second value of the plurality of values wherein the second value is greater than a subset of the plurality of values and the first value is greater than the second value;
- generate a confidence score using the signal characteristics and based on a ratio between the first value and the second value;
- determine that the confidence score satisfies a confidence threshold, the confidence threshold indicating a confidence that the candidate detection event is an actual detection event;
- and
- activate a process to capture, using the camera, one or more of an image or video in response to the confidence score satisfying the confidence threshold.
8 more elements
Dependencies are inferred from the claim text.