48 results about "Digital elevation map" patented technology

An airborne reconnaissance system comprising: (1) Gimbals having at least two degrees of freedom; (2) At least one array of light sensors positioned on the gimbals, for being directed by the same within at least two degrees of freedom; (3) Map storage means for storing at least one Digital Elevation Map of an area of interest, divided into portions; (4) Inertial Navigation System for real-time providing to a gimbals control unit navigation and orientation data of the aircraft with respect to a predefined global axes system; (5) Portion selection unit for selecting, one at a time, another area portion from the area of interest; and (6) servo means for directing the gimbals. The system uses data from the inertial navigation system and from the digital elevation map for real-time calculating direction to selected area portions, and for maintaining the direction during integration of light from the terrain, and for producing corresponding images of area portions.

A airborne reconnaissance system comprising: (1) Gimbals having at least two degrees of freedom; (2) At least one array of light sensors positioned on the gimbals, for being directed by the same within at least two degrees of freedom; (3) Map storage means for storing at least one Digital Elevation Map of an area of interest, divided into portions; (4) Inertial Navigation System for real-time providing to a gimbals control unit navigation and orientation data of the aircraft with respect to a predefined global axes system; (5) Portion selection unit for selecting, one at a time, another area portion from the area of interest; and (6) servo means for directing the gimbals. The system uses data from the inertial navigational system and from the digital elevation map for real-time calculating direction to selected area portions, and for maintaining the direction during integration of light from the terrain, and for producing corresponding images of area portions.

A method and apparatus for performing wide area terrain mapping. The system comprises a digital elevation map (DEM) and mosaic generation engine that processes images that are simultaneously captured by an electro-optical camera (RGB camera) and a LIDAR sensor. The image data collected by both the camera and the LIDAR sensor are processed to create a geometrically accurate three-dimensional view of objects viewed from an aerial platform.

A navigation system is described which includes a navigation processor, an inertial navigation unit configured to provide a position solution to the navigation processor, and a digital elevation map. The described navigation system also includes a radar altimeter having a terrain correlation processor configured to receive map data from the digital elevation map and provide a position solution based on radar return data to the navigation processor. A map quality processor within the navigation system is configured to receive map data from the digital elevation map and provide a map quality factor to the navigation processor which weights the position solution from the terrain correlation processor according to the map quality factor and determines a position solution from the weighted terrain correlation processor position solution and the position solution from the inertial navigation unit.

The invention relates to a single camera ground target point spatial positioning method based on a digital elevation map. The method comprises the following steps: obtaining a single camera parameter and establishing a spatial coordinate system; setting a single camera position as (XC, YC, ZC), using a single camera to acquire the image coordinate m (u, v) of a ground target point M (X1, Y1, Z1), and determining a spatial imaging line L from a known image coordinate; defining a nearest intersection to the single camera as an effective intersection because there may be multiple intersections between the spatial imaging line L and the digital elevation map, traversing the digital elevation map according to the projection of the spatial imaging line L in the X-Y plane in the spatial coordinate system, determining the position of the effective intersection by comparing the height difference between the digital elevation map and the corresponding point on the spatial imaging line L so as to obtain the spatial coordinate of the ground target point. The method may position the ground target point without auxiliary feature points except the target point.

A GNSS receiver includes a RF front end for receiving GNSS ranging signals, a navigation processor for calculating location from the ranging signals, and a repository of static data. The navigation processor includes the static data in the location calculation. Examples of static data include a digital elevation map, coordinates of tunnel entrances for use when the receiver resumes reception of the signals upon exiting a tunnel, and descriptions of structures in sufficient detail to enable multipath mitigation.

The invention discloses a helicopter flight path planning map processing method based on terrain gradient binaryzation, which comprises the following steps: extracting elevation data and map parameters in a digital elevation map, and determining a map precision value k according to the map parameters; the step length of input waypoints of the helicopter, the safety distance of helicopter flight, helicopter performance parameters and aircraft parameters under task constraints are set; the step length requirement and the map precision value are compared, and the digital elevation map capable of directly meeting the task requirement is obtained through processing by using algorithms such as an interpolation algorithm and map compression, so that the influence of too high or too low map precision value on the flight path planning effect is avoided; a grey-scale map is generated by calculating a gradient value, so that the efficiency of cost calculation of subsequent route planning is improved; the gray-scale map is binarized by combining helicopter performance parameters and parameters under task requirements, so that the algorithm efficiency is greatly improved for subsequent route planning; the technical problem of low flight path planning efficiency caused by large data volume and information redundancy of a digital elevation map in the prior art is solved.