Method for geolocalization of one or more targets
First Claim
1. A method for geolocalization of at least one stationary target P from an aircraft by means of a passive optronic sensor and by software implemented on electronic cards, said method comprising the following steps:
- acquiring by a sensor of at least one image I1 containing the target P from a position C1 of the aircraft and of an image I2 containing the target P from a position C2 of the aircraft, the images I1 and I2 having an area of overlap;
identifying in said overlap area of the target P common to the two images I1 and I2 and determination of the position of the common target P in each of the two images;
calculating a distance d between a point C, of coordinates relative to C1 and C2, and the target P, as a function of the angle β
1 between a reference direction and the line of sight of the image I1, the angle β
2 between the same reference direction and the line of sight of the image I2, and of the position of the target P in the image I1 and in the image I2; and
P being defined in a terrestrial reference frame by its x-coordinate X and its y-coordinate Y relative to the projection on the ground of the aircraft C, calculating X and Y for the target P as a function of the distance d.
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Abstract
The subject of the invention is a method for geolocalization of one or more stationary targets from an aircraft by means of a passive optronic sensor. The sensor acquires at least one image I1 containing the target P from a position C1 of the aircraft and an image I2 containing the target P from a position C2 of the aircraft. The images I1 and I2 have an area of overlap. The overlap area has at least one target P identified which is common to the two images I1 and I2. The position of each target P is determined in each of the two images. The distance d is calculated between each target P and a point C, situated for example in the vicinity of C1 and C2, as a function of the angle β1 between a reference direction and the line of sight of the image I1, the angle β2 between the same reference direction and the line of sight of the image I2, of the position of each target P in the image I1 and in the image I2. The positions of the targets are calculated relative to the projection of the aircraft on the ground when at C, as a function of the distances d in a terrestrial reference frame.
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Citations
20 Claims
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1. A method for geolocalization of at least one stationary target P from an aircraft by means of a passive optronic sensor and by software implemented on electronic cards, said method comprising the following steps:
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acquiring by a sensor of at least one image I1 containing the target P from a position C1 of the aircraft and of an image I2 containing the target P from a position C2 of the aircraft, the images I1 and I2 having an area of overlap; identifying in said overlap area of the target P common to the two images I1 and I2 and determination of the position of the common target P in each of the two images; calculating a distance d between a point C, of coordinates relative to C1 and C2, and the target P, as a function of the angle β
1 between a reference direction and the line of sight of the image I1, the angle β
2 between the same reference direction and the line of sight of the image I2, and of the position of the target P in the image I1 and in the image I2; andP being defined in a terrestrial reference frame by its x-coordinate X and its y-coordinate Y relative to the projection on the ground of the aircraft C, calculating X and Y for the target P as a function of the distance d. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20)
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Specification