Abstract:
The general field of the invention is that of methods of three-dimensional synthetic representation of a terrain. These methods are implemented in a vehicle piloting and navigation aid system. The method according to the invention comprises the following steps: Step 1: Computation, for a determined position of the vehicle, of a first part or of the entirety of the terrain seen through the viewing system; Step 2: Computation, for the said terrain portion, of the curvature of the said terrain at each point; Step 3: Computation, as a function of the position and of the orientation of the carrier, of the position of the displayed points; Step 4: Computation of the luminance of each point of the said visible terrain portion according to a determined law, dependent on the said curvature; Step 5: Display by the viewing system of the luminance of each point.
Abstract:
A method for three-dimensional graphic representation of the outside landscape in an on-board display system for aircraft comprises a graphical computer and a display screen. The graphic representation is computed to a visibility distance. In the method the zero pitch line of the aircraft forms, with the real horizon line, a first angle, the line representing the limit of the visibility distance forming, with the real horizon line, a second angle, in a first step, the graphical computer determines the maximum visibility distance such that the difference between the first angle and the second angle remains less than a determined value; in a second step, the graphical computer determines the visibility distance as a function of the maximum visibility distance, of the maximum altitude of the relief of the local environment and of the flight phase.
Abstract:
The general field of the invention is that of methods for three-dimensional conformal representation of a terrain. The method is used in a piloting and navigation assistance system of an aircraft. The assistance system comprises a navigation system, a cartographic database, electronic calculation means a meteorological database and a display system allowing the superimposition of synthetic images on the exterior. The method comprises the following steps: Step 1: Calculation, for a determined position of the vehicle, of the terrain perceptible through the display system; Step 2: Selection of a part of the said terrain as a function of a distance or of an altitude or of a range of altitudes; Step 3: Calculation of a three-dimensional conformal cartographic representation of the said selected part of the terrain; and Step 4: Display of the said cartographic representation by the display system.
Abstract:
The general field of the invention is that of the methods for graphic representation of the relative position of the sky and of the earth in an onboard display system for aircraft, said graphic representation being displayed on a display screen comprising piloting and navigation information superimposed on a three-dimensional synthetic representation of the outside landscape. Said graphic representation is displayed only when the attitude of the aircraft is unusual, an unusual attitude corresponding to a roll value or to a pitch value located outside of a first range of nominal values. It comprises two disc segments of identical form, that are opaque and of different colour, situated symmetrically on a circle concentric to that bearing the roll scale, the straight-line segments of the two disc segments being parallel to the line representing the zero longitudinal trim indicator, the rotation of the two disc segments being slaved to the rotation of said zero longitudinal trim indicator.
Abstract:
The general field of the invention is that of the graphical representation of a synthetic three-dimensional view of the exterior landscape in an on-board visualization system for aircraft, said graphical representation being displayed on a visualization screen comprising the piloting and navigation information of said aircraft superposed onto said three-dimensional synthetic representation of the exterior landscape, said synthetic representation being computed up to a first determined distance, characterized in that said three-dimensional synthetic representation is tilted at a tilt angle about an axis positioned at the level of the terrain in a substantially horizontal plane, and substantially perpendicularly to an axis between the flight direction and the heading of the aircraft, said axis moving with the aircraft.
Abstract:
The invention relates to a method for securing the operation of a synthetic viewing system of an aircraft. This method comprises the steps of determining at least one control object in the field of view of the synthetic vision system and determining at least one control point belonging to each control object and verifying the consistency of the display of the synthetic vision system. The verification step comprises the sub-steps of recovering a first position corresponding to the displayed position of each control point on the corresponding outline on the display of the synthetic vision system, determining a second position of each control point on the display of the synthetic vision system and comparing the first and second positions.
Abstract:
The general field of the invention is that of the methods for three-dimensional graphic representation of at least one landing runway on a display device of an onboard display system for aircraft, said graphic representation being displayed in a synthetic of an outside landscape, said runway comprising a coloured rectangular form, an outline surrounding said form and markings the position of the aircraft in relation to said runway being known in a horizontal plane with a first accuracy and in a vertical axis with a second accuracy. When the first accuracy is above a first threshold and/or when the second accuracy is above a second threshold, the appearance of the rectangular form or of the outline or of at least one marking is modified.
Abstract:
The general field of the invention is that of methods of representing a cartographic image in a geolocated synthetic vision system for vehicles, said system including a cartographic database, geolocation means, graphic generation means enabling generation of a two-dimensional or three-dimensional synthetic view of said terrain, and a display device. In the method in accordance with the invention, the angular position of each point of the synthetic view is known with an angular error depending on the distance of said vehicle and the accuracy of geolocation of said vehicle, if said angular error is less than or equal to a predetermined angular tolerance, the point is represented in a standard representation mode and if said angular error is greater than a predetermined angular tolerance, the point is represented in an uncertainty representation mode different from the standard representation mode. The applications are preferably aeronautical.
Abstract:
This method consists in: obtaining the positions of the thresholds of the runways of the aerodrome; a runway model being a polygonal modeling of the runways, associating each runway with polygons, a portion common to two secant runways being represented by polygons common to the modelizations of the two secant runways; determining a correction plane of a terrain model located below the thresholds of the runways; defining a contour area around the runway model, based on the runway model and the correction plane; correcting a terrain model so that any point outside the contour area is projected onto the correction plane and any point within the contour area is projected onto the contour area; combining the corrected field model and the runway model to obtain an improved virtual representation.
Abstract:
The invention relates to a method for developing a three-dimensional representation of a terrain overflown by an aircraft able to be piloted by a pilot via a control station. The method includes for representation of at least one current terrain element, following steps: determining a first distance between a first terrain element and the aircraft; determining a second distance between a second terrain element and the aircraft; and calculating a resultant display intensity of the current terrain element as a function of a difference between the first distance and the second distance.