Infrared sensor for short range detection wherein the sun may be in the field of view of the detector
First Claim
1. An infrared sensor for short range detection of vehicles, said sensor able to detect vehicles with sun in said sensor'"'"'s field of view, said sensor being operated upon a spinning platform wherein said spinning platform has precessional motion, said sensor comprising:
- a) first detector sensitive to radiation in a first predetermined frequency band;
b) second detector sensitive to radiation in a second predetermined frequency band, said second detector tracking a radiation signal if said radiation signal is below a threshold in said first predetermined frequency band; and
c) objective lens to focus said radiation on said first and said second detector.
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Accused Products
Abstract
An infrared sensor for short range detection of aircraft wherein the sensor is designed to operate with the sun in the field of view yet still be able to track its target. The sensor operates on a spinning platform, wherein the spinning platform has precessional motion. The sensor has a first detector array for detecting the presence of the sun and other background clutter. The sensor further has a second detector array sensitive to radiation in a predetermined frequency band for tracking a specific target. The sensor has an objective lens to focus the radiation on the first and second detector arrays.
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Citations
15 Claims
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1. An infrared sensor for short range detection of vehicles, said sensor able to detect vehicles with sun in said sensor'"'"'s field of view, said sensor being operated upon a spinning platform wherein said spinning platform has precessional motion, said sensor comprising:
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a) first detector sensitive to radiation in a first predetermined frequency band; b) second detector sensitive to radiation in a second predetermined frequency band, said second detector tracking a radiation signal if said radiation signal is below a threshold in said first predetermined frequency band; and c) objective lens to focus said radiation on said first and said second detector. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. An infrared sensor for short range detection of vehicles, said sensor having a radiation source occasionally in said sensor'"'"'s field of regard, said sensor comprising:
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a) first detector sensitive to radiation produced by said radiation source; b) second detector sensitive to radiation produced by said vehicle; c) spinning platform, said first and said second detector being mounted to said platform; and d) central processing unit for processing said first an said second sensor'"'"'s detections, said central processing unit tracking said second detector'"'"'s detected signal if said detected signal is absent from said first detector. - View Dependent Claims (12, 13, 14, 15)
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Specification