Abstract: The present invention relates to a method for determining positions by an optronic system in a scene, the scene comprising reference elements of known geographic coordinates, the optronic system comprising the following elements integrated into said optronic system: a. a digital imager, b. a memory wherein is stored, for each reference element of the scene, an indicator representative of said point associated with the geographic coordinates of said point, c. a display element that displays the indicators stored in the memory, d. a measurement module comprising at least one element chosen from among: a compass, a goniometer and a telemeter, e. a calculation unit, the method being implemented by the elements integrated in the optronic system.

Abstract: A propulsion system includes a drive shaft that rotates about an axis, a fan, a fan shaft that drives the fan about the axis, a reduction mechanism coupling the drive and fan shafts, a compression section driven by the drive shaft, and an inlet channel that extends between the fan and the compression section. The inlet channel includes inner and outer ferrules delimiting an air inlet flow path, the inner ferrule having a minimum radius. The reduction mechanism includes two reduction stages including two or more planet gears circumferentially distributed around the axis, each planet gear including a first portion meshed with the drive shaft and a second portion meshed with the fan shaft and being mounted fixed with respect to the inner ferrule and having a maximum radius greater than the minimum radius such that the air inlet flow path extends partly between the two or more planet gears.

Abstract: A method for estimating the bearing of an optronic system in a geographical reference frame, the optronic system being situated at a first position and denoted first optronic system is provided.

Abstract: A method for estimating the bearing of an optronic system in a geographical reference frame, the optronic system being situated at a first position and denoted first optronic system is provided.

Abstract: The invention relates to a method of determining the absolute direction of an object of a scene (1), with a predetermined desired performance.

Abstract: The invention relates to a method of determining the absolute direction of an object of a scene (1), with a predetermined desired performance.

Abstract: A method for formulating a knowledge database of object images acquired by an imaging device furnished with a sensor, including defining N classes each including a set of objects represented by a label and a set of characteristics, learning decision rules associated with these classes, definition of K contextual information cues regarding image background fk, with k varying from 1 to K and K>1, association of one of these information cues regarding image background fk with each object, allotting of the objects into M new classes, with N<M?K×N, each including a set of objects represented by a new label including an old label and one of said information cues regarding image background fk and the set of characteristics of these objects, definition for each background fk of a subset Qk of these M classes associated with this image background, learning of decision rules for each of these subsets Qk.

Abstract: A method for geo-referencing an area by an imaging optronics system which comprises acquiring M successive images by a detector, the imaged area being distributed between these M images, with M?1. It comprises: measuring P distances d1, d2, . . . , dP between the system and P points of the area, called range-found points, with P?3, distributed in K of said images with 1?K?M; acquiring the positioning xm, ym, zm of the detector at acquisition of the M images; measuring the attitude ?m, ?m, ?m of the detector at acquisition of the M images; acquiring the coordinates in these K images of image points (p1, q1), (p2, q2), . . . , (pP, qP) corresponding to the P range-found points; and estimating the parameters of exposure conditions xe, ye, ze, ?e, ?e, ?e corresponding to the M images as a function of positionings, of attitudes, distances and coordinates of the image points, to correct errors on the parameters xm, ym, zm, ?m, ?m, ?m of each of the M images.

Abstract: A method for calibrating measurement instruments of an optronic system in motion, with positions P1, P2, . . . , Pi, . . . , comprises: a device for acquiring images of a scene comprising a fixed object G0; and means for tracking the fixed object G0 during the acquisition of these images; means for obtaining the positions P1, P2, . . . ; at least one instrument for measuring the distance and/or an instrument for measuring angles of orientation and/or of attitude between this measurement instrument and the fixed object G0, according to a line of sight LoS. It comprises the following steps: acquisition at instants t1, t2, . . . of at least two images, each image being acquired on the basis of different positions P1, P2, . . . of the system, the fixed object G0 being sighted in each image, but its position being unknown; acquisition at the instants t?1, t?2, . . . of measurements of distance and/or of angle; synchronization of the measurements of distance and/or of angle with the positions P1, P2, . . .

Abstract: A method for geolocating a fixed non-cooperating object by means of an embedded system onboard a mobile platform, equipped with distance acquisition means for acquiring the distance between the object and the system, and position acquisition means for acquiring the position of the system, includes acquiring two distance measurements of the object relative to two distinct positions of the system, thus defining two object position-distance pairs, the positions being those of the system and being obtained by the position acquisition means, and the distances being obtained by the distance acquisition means. The method also includes acquiring at least one other object position-distance pair, and calculating the geolocation of the object from these object position-distance pairs.

Abstract: A method for formulating a knowledge database of object images acquired by an imaging device furnished with a sensor, including defining N classes each including a set of objects represented by a label and a set of characteristics, learning decision rules associated with these classes, definition of K contextual information cues regarding image background fk, with k varying from 1 to K and K>1, association of one of these information cues regarding image background fk with each object, allotting of the objects into M new classes, with N<M?K×N, each including a set of objects represented by a new label including an old label and one of said information cues regarding image background fk and the set of characteristics of these objects, definition for each background fk of a subset Qk of these M classes associated with this image background, learning of decision rules for each of these subsets Qk.

Abstract: A method for geo-referencing an area by an imaging optronics system which comprises acquiring M successive images by a detector, the imaged area being distributed between these M images, with M?1. It comprises: measuring P distances d1, d2, . . . , dP between the system and P points of the area, called range-found points, with P?3, distributed in K of said images with 1?K?M; acquiring the positioning xm, ym, zm of the detector at acquisition of the M images; measuring the attitude ?m, ?m, ?m of the detector at acquisition of the M images; acquiring the coordinates in these K images of image points (p1, q1), (p2, q2), . . . , (pP, qP) corresponding to the P range-found points; and estimating the parameters of exposure conditions xe, ye, ze, ?e, ?e, ?e corresponding to the M images as a function of positionings, of attitudes, distances and coordinates of the image points, to correct errors on the parameters xm, ym, zm, ?m, ?m, ?m of each of the M images.

Abstract: A method for calibrating measurement instruments of an optronic system in motion, with positions P1, P2, . . . , Pi, . . . , comprises: a device for acquiring images of a scene comprising a fixed object G0; and means for tracking the fixed object G0 during the acquisition of these images; means for obtaining the positions P1, P2, . . . ; at least one instrument for measuring the distance and/or an instrument for measuring angles of orientation and/or of attitude between this measurement instrument and the fixed object G0, according to a line of sight LoS. It comprises the following steps: acquisition at instants t1, t2, . . . of at least two images, each image being acquired on the basis of different positions P1, P2, . . . of the system, the fixed object G0 being sighted in each image, but its position being unknown; acquisition at the instants t?1, t?2, . . . of measurements of distance and/or of angle; synchronization of the measurements of distance and/or of angle with the positions P1, P2, . . .

Abstract: A method for geolocating a fixed non-cooperating object by means of an embedded system onboard a mobile platform, equipped with distance acquisition means for acquiring the distance between the object and the system, and position acquisition means for acquiring the position of the system, includes acquiring two distance measurements of the object relative to two distinct positions of the system, thus defining two object position-distance pairs, the positions being those of the system and being obtained by the position acquisition means, and the distances being obtained by the distance acquisition means. The method also includes acquiring at least one other object position-distance pair, and calculating the geolocation of the object from these object position-distance pairs.

Abstract: A lifting device makes it possible to manipulate loads within a tight enclosure with an operator remaining outside the enclosure. The device includes a main arm fitted so as to slide in an opening of a wall surrounding the enclosure, by way of a hose or sleeve. An articulated beam is mounted so as to pivot at the end of the main arm. This pivoting action can be controlled by two parallel rods mounted within the arm. The device is applicable to, for example, the handling of heavy loads within tight enclosures in the nuclear field.