A target tracking device transmits a radio frequency beam towards a scene, detects backscatter comprising at least a portion of the RF beam reflected from a reflecting object at the scene, and performs operations that include determining whether the reflecting object is a tracking target, determinin
A target tracking device transmits a radio frequency beam towards a scene, detects backscatter comprising at least a portion of the RF beam reflected from a reflecting object at the scene, and performs operations that include determining whether the reflecting object is a tracking target, determining a position of the tracking target, and generating tracking information indicative of a position adjustment for maintaining an alignment of the target tracking device and the tracking target. A target tracking method includes transmitting a millimeter wavelength beam in a direction of orientation of a camera, detecting backscatter reflected from a reflecting object, determining whether the reflecting object is a tracking target, and determining a position of the tracking target. If a distance to the tracking target has increased from a prior distance, tracking information indicative of a position adjustment for offsetting the increase in distance may be generated.
대표청구항▼
1. A target tracking device, comprising: a transmitter configured to transmit a radio frequency beam towards a scene wherein the radio frequency beam includes a first component and a second component;a receiver configured to detect backscatter comprising at least a portion of the radio frequency bea
1. A target tracking device, comprising: a transmitter configured to transmit a radio frequency beam towards a scene wherein the radio frequency beam includes a first component and a second component;a receiver configured to detect backscatter comprising at least a portion of the radio frequency beam reflected from a reflecting object; anda controller configured to perform operations, comprising: determining whether the reflecting object is a tracking target;determining a position of the tracking target; andgenerating tracking information indicative of a position adjustment for maintaining an alignment of the target tracking device and the tracking target;wherein determining whether the reflecting object is a tracking target includes: determining that the tracking target reflects the first component of the radio frequency beam, the first component having a first frequency; anddetermining that the tracking target filters the second component of the radio frequency beam, the second component having a second frequency. 2. The target tracking device of claim 1, wherein the transmitter is configured to generate a radio frequency signal and scan the radio frequency signal over a field having a particular width to generate the radio frequency beam. 3. The target tracking device of claim 2, wherein a ratio of a dimension of the tracking target to the wavelength of the radio frequency signal is in the range of approximately 3:1 to approximately 5:1. 4. The target tracking device of claim 1, wherein a wavelength of at least one component of the radio frequency beam is in the range of approximately 4 to 12 mm. 5. The target tracking device of claim 1, wherein the operations include: adjusting a position of the target tracking device in accordance with the tracking information. 6. The target tracking device of claim 5, wherein adjusting the position of the target tracking device includes signaling one or more actuators coupled to the target tracking device to adjust the position of the target tracking device in accordance with the tracking information. 7. The target tracking device of claim 1, wherein the target tracking device comprises a target tracking camera, including: an exposure medium; anda lens configured to focus light from the scene onto the exposure medium to record an image of the scene in the exposure medium. 8. The target tracking device of claim 7, wherein the operations include: responsive to detecting a lack of backscatter or insufficient backscatter, performing at least one of a group of operations comprising: reducing a magnification of the lens;adjusting a position of the target tracking device; andincreasing a width of the radio frequency beam. 9. The target tracking device of claim 1, wherein the backscatter comprises a portion of the radio frequency beam reflected from a retroreflector target. 10. The target tracking device of claim 9, wherein the backscatter comprises a portion of the radio frequency beam reflected from a tetrahedral retroreflector. 11. The target tracking device of claim 1, wherein the tracking target is coated with film configured to filter the second frequency. 12. The target tracking device of claim 1, wherein determining the position of the tracking target includes determining a change of position and wherein the operations include: responsive to the change of position exceeding a maximum threshold, modifying or re-generating the tracking information. 13. The target tracking device of claim 1, wherein determining whether the reflecting object is a tracking target includes: determining that the reflecting object is not a tracking target responsive to detecting a polarization change in the backscatter. 14. A target tracking camera comprising: an exposure medium;a camera lens oriented towards a scene and configured to focus light from the scene on the exposure medium to record an image of the scene in the exposure medium;a scanning transmitter to transmit a radio frequency beam toward a direction of orientation of the camera;a receiver to detect backscatter comprising at least a portion of the radio frequency beam reflected from a reflecting object;a controller; anda computer readable medium including program instructions that, when executed by the controller, cause the controller to perform operations including:responsive to detecting insufficient backscatter, performing at least one of a group of operations comprising: reducing a magnification of the lens;adjusting a position of the target tracking device; andincreasing a width of the radio frequency beamresponsive to detecting sufficient backscatter, determining whether the reflecting object is a tracking target;responsive to determining the reflecting object is a tracking target, determining a position of the tracking target; andgenerating tracking information indicative of a position adjustment for maintaining the tracking target within the scene. 15. The target tracking camera of claim 14, wherein the radio frequency beam includes a first component and a second component and wherein determining whether the reflecting object is a tracking target includes: determining that the tracking target reflects the first component of the radio frequency beam, the first component having a first frequency; anddetermining that the tracking target filters the second component of the radio frequency beam, the second component having a second frequency. 16. The target tracking camera of claim 14, wherein a wavelength of at least one component of the radio frequency beam is in the range of approximately 4 to 12 mm and further wherein a ratio of a dimension of the tracking target to the wavelength of the radio frequency beam is in the range of approximately 3:1 to approximately 5:1. 17. The target tracking camera of claim 14, wherein the operations include: adjusting a position of the target tracking camera in accordance with the tracking information. 18. A target tracking method, comprising: transmitting a millimeter wavelength beam toward a direction of orientation of a camera;detecting backscatter comprising at least a portion of the millimeter wavelength beam reflected from a reflecting object;determining whether the reflecting object is a tracking target;responsive to determining the reflecting object is a tracking target, determining a position of the tracking target; andresponsive to determining from the position of the tracking target that a distance to the tracking target has increased from a prior distance, generating tracking information indicative of a position adjustment for offsetting the increase in distance;wherein determining whether the reflecting object is a tracking target includes: determining that the tracking target reflects a first component of the radio frequency beam, the first component having a first frequency; anddetermining that the tracking target filters a second component of the radio frequency beam, the second component having a second frequency. 19. The target tracking method of claim 18, further comprising: responsive to receiving the tracking information, adjusting a position of the target tracking device to offset the increase in distance.
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이 특허에 인용된 특허 (9)
Friesel, Mark A., Correlation of 3-D point images.
Ernst, Thomas Michael; Prieto, Thomas Edmund; Armstrong, Brian Stewart Randall, Motion tracking system for real time adaptive imaging and spectroscopy.
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