ELECTRO-OPTIC SYSTEM FOR CROSSWIND MEASUREMENT
First Claim
1. A system encased in a housing comprising:
- an optical transmitter;
a single-aperture optical receiver including;
an objective lens that collects light, at the aperture of the optical receiver, which is scattered back from a laser spot illuminated on a target by the optical transmitter,reimaging optics that generate a de-magnified image of an entrance pupil of the objective lens, andan image sensor that detects the entrance pupil image;
a display device; and
a processor,wherein;
the processor processes the detected image to obtain first and second signals, the first signal representing a summation of pixels from one region of the detected entrance pupil image as a function of time, the second signal representing a summation of pixels from the other region of the detected entrance pupil image as a function of time,the processor processes the first and second signals to determine a time delay from which a path-weighted average crosswind toward the target is calculated, andthe processor calculates an offset aim point based on the path-weighted average crosswind, andthe offset aim point is displayed on the display device.
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Accused Products
Abstract
An electro-optic system, e.g., mounted to a weapon, measures down range winds and a range-to-target for compensating the ballistic hit point. The system may include an optical light source, collimated to generate a laser spot on the target. The system may include a wind measurement receiver that captures laser light scattered from the target. The captured light may be modulated by atmospheric scintillation eddies, producing optical patterns which change in time and move with the crosswind. These patterns may be analyzed by a processor using covariance techniques in either the time-domain or the frequency-domain to determine path-integrated crosswinds and associated errors. Ranging is done by measuring the time of flight of the laser pulse to the target collecting the scattered signal from the target. Compensated ballistic hit point, measurement errors and other data may be displayed on a micro-display digital eyepiece, or projected onto the direct view optics (DVO) of a riflescope so as to be overlaid in real-time on the optical image of the target.
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Citations
16 Claims
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1. A system encased in a housing comprising:
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an optical transmitter; a single-aperture optical receiver including; an objective lens that collects light, at the aperture of the optical receiver, which is scattered back from a laser spot illuminated on a target by the optical transmitter, reimaging optics that generate a de-magnified image of an entrance pupil of the objective lens, and an image sensor that detects the entrance pupil image; a display device; and a processor, wherein; the processor processes the detected image to obtain first and second signals, the first signal representing a summation of pixels from one region of the detected entrance pupil image as a function of time, the second signal representing a summation of pixels from the other region of the detected entrance pupil image as a function of time, the processor processes the first and second signals to determine a time delay from which a path-weighted average crosswind toward the target is calculated, and the processor calculates an offset aim point based on the path-weighted average crosswind, and the offset aim point is displayed on the display device. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A method employed by a system encased in a housing, comprising:
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utilizing an optical transmitter in the system to illuminate a laser spot on a target; utilizing an objective lens at an aperture of a single-aperture optical receiver in the system to collect light which is scattered back from the laser spot illuminated on the target; utilizing reimaging optics in the single-aperture optical receiver to generate a de-magnified image of an entrance pupil of the objective lens, and utilizing an image sensor in the single-aperture optical receiver to detect the entrance pupil image; utilizing a processor in the system to; process the detected image to obtain first and second signals, the first signal representing a summation of pixels from one region of the detected entrance pupil image as a function of time, the second signal representing a summation of pixels from the other region of the detected entrance pupil image as a function of time, process the first and second signals to determine a time delay from which a path-weighted average crosswind toward the target is calculated, and calculate an offset aim point based on the path-weighted average crosswind; and displaying the offset aim point on a display device of the system. - View Dependent Claims (10, 11, 12, 13, 14, 15, 16)
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Specification