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.

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: 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.

Abstract: A method is provided for two-dimensional graphic representation on an aircraft display screen of an image or of a symbol or of a symbology (PE) whose three-dimensional coordinates in a terrestrial reference frame are known. The graphic representation of the object or of the symbol is stretched in a vertical axis by a constant factor (?) lying between 1.0 and 1.2, the stretching having, for its neutral plane, the local horizontal geographic plane containing the aircraft. Furthermore, when the symbology is a pitch scale consisting of graduations, two successive graduations being separated by a constant angular value, the graphic representations of two successive graduations of the pitch scale are separated by a constant distance on the display screen.

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 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: A method for managing a symbology in an on-board viewing system for an aircraft, the graphical representation comprising the piloting and navigation symbology overlaid on a representation of the exterior landscape, the symbology comprises a first angular attitude scale comprising a first symbol called an aircraft mockup, a second speed scale, a third altitude scale and a second symbol called the speed vector. When the angular lateral distance between the position of the first symbol and the position of the second symbol is such that the second symbol is not overlaid on the lateral scales, the various scales are represented in the nominal position; when the angular lateral distance between the position of the first symbol and the position of the second symbol is such that the second symbol is overlaid on one of the scales, the various scales move and/or their size decreases.

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 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: A method is provided for two-dimensional graphic representation on an aircraft display screen of an image or of a symbol or of a symbology (PE) whose three-dimensional coordinates in a terrestrial reference frame are known. The graphic representation of the object or of the symbol is stretched in a vertical axis by a constant factor (?) lying between 1.0 and 1.2, the stretching having, for its neutral plane, the local horizontal geographic plane containing the aircraft. Furthermore, when the symbology is a pitch scale consisting of graduations, two successive graduations being separated by a constant angular value, the graphic representations of two successive graduations of the pitch scale are separated by a constant distance on the display screen.

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: A method is provided for managing and displaying symbols that are geo-referenced in a viewing device. The method is implemented in a synthetic viewing system comprising a navigation system, a cartographic database comprising a geo-referenced object, electronic calculation means to calculate the symbol which is itself geo-referenced representative of the geo-referenced object and a viewing device. The electronic calculation means are arranged so as to calculate the total surface area of the geo-referenced symbol to be displayed on the viewing device and a photometric and/or colorimetric coefficient representative of the conformal symbol, the photometric and/or colorimetric coefficient being a decreasing function of the total surface area. The photometric and/or colorimetric coefficient is a coefficient of opacity or of luminance or of hue or of saturation.

Abstract: A method for managing a symbology in an on-board viewing system for an aircraft, the graphical representation comprising the piloting and navigation symbology overlaid on a representation of the exterior landscape, the symbology comprises a first angular attitude scale comprising a first symbol called an aircraft mockup, a second speed scale, a third altitude scale and a second symbol called the speed vector. When the angular lateral distance between the position of the first symbol and the position of the second symbol is such that the second symbol is not overlaid on the lateral scales, the various scales are represented in the nominal position; when the angular lateral distance between the position of the first symbol and the position of the second symbol is such that the second symbol is overlaid on one of the scales, the various scales move and/or their size decreases.

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 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 three-dimensional graphical representation of a landing runway on a viewing screen of an onboard viewing system for aircraft, the said graphical representation being displayed in a synthetic view of an exterior landscape. The graphical representation according to the invention comprises a line disposed along the axis of the runway, the said line being a straight stripe inclined by an angle of between one and a few degrees with respect to the horizontal, the said line beginning at the runway threshold.

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 onboard visualisation system for aircraft, said graphical representation being displayed on a visualisation 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, characterised in that said three-dimensional synthetic representation is tilted at a tilt angle about an axiom 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 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.