164 results about "Terrain mapping" patented technology

The technology of the 4D-GIS system deploys a GIS-based algorithm used to determine the location of a moving target through registering the terrain image obtained from a Moving Target Indication (MTI) sensor or small Unmanned Aerial Vehicle (UAV) camera with the digital map from GIS. For motion prediction the target state is estimated using an Extended Kalman Filter (EKF). In order to enhance the prediction of the moving target's trajectory a fuzzy logic reasoning algorithm is used to estimate the destination of a moving target through synthesizing data from GIS, target statistics, tactics and other past experience derived information, such as, likely moving direction of targets in correlation with the nature of the terrain and surmised mission.

The invention relates to a method of constructing a fine discrete road grid in an urban drainage simulation system and belongs to the cross field of municipal engineering information technology, database technology and geologic information system technology. From the demand on construction of a waterlogging simulation model, under the restraint conditions in road design specifications and on the basis of conventional map measured elevation points, the number and positions of interpolation points are optimized under the drainage simulation system platform by the fitting method of local elevation change curves of cross-longitudinal road section and by road characteristic terrain vector layers according to mathematical model interpolation encryption plane and elevation information of physical road tomography; accordingly, a fine discrete road elevation grid unit is constructed, true tomographic road features are expressed quickly and economically, the demand on precise simulation of waterlogging models is met, especially the dredging and resisting actions of road micro-tomographic features upon waterflow can be correctly expressed, and the method is significant to promotion and application of the drainage simulation technology.

A method and apparatus for terrain mapping and / or obstacle detection for aircraft, including (a) transmitting a non-scanning beam that illuminates the terrain and / or obstacles; (b) receiving a Doppler shifted signal that is Doppler frequency shifted by an amount dependent on an angle between a line of flight of the aircraft and scatterers that reflect the transmitted beam; (c) determining the angle from the Doppler frequency; (d) determining the range of at least some of said scatterers; and (e) determining the azimuth and elevation of the scatterers.

An all fiber optic laser based scanning system for real time terrain mapping under degraded visual conditions is disclosed. A laser output is modulated to achieve a desired pulse width and pulse repetition frequency (PRF) and the modulated signal is amplified. The amplified optical signals are split into N channels that correspond to N elements of an optically phased array that steers light by modulating the phase of light entering and exiting the optical system. By applying a linear phase shift across the beam's wave front, the light propagating along the system's optical axis is steered to an off-axis angle. A real time map of an underlying terrain is accomplished by sweeping the N channel array across the terrain while collecting range information from each scan grid.

A generalized framework is disclosed in which a wide variety of propagation models can be cast in a matrix-based format using arbitrary matrix coefficients. Casting propagation models in the matrix-based framework enables efficient computer implementation and calculation, ease of tuning, admissibility, and aggregating multiple propagation models into a single matrix-based model. Matrix-based propagation models based on transmitter-receiver azimuth orientation, transmitter antenna height, terrain elevation, and clutter are also disclosed. The propagation models can be used in conjunction with automated data acquisition from information sources such as topographic maps, clutter maps, etc.

The invention provides a novel shallow sea sand wave area multi-beam sounding terrain reconstruction method based on remote sensing image features. Terrain reconstruction is conducted to multi-beam sounding data which are obtained in an interval type measuring line mode by that feature information (sand wave ripples and wave crests) and a sand wave terrain distribution law are utilized, wherein the feature information (sand wave ripples and wave crests) and the sand wave terrain distribution law of the shallow sea sand wave terrain are presented in a remote sensing image. Therefore, integrated sand wave terrain information is obtained. The shallow sea sand wave area multi-beam sounding terrain reconstruction method based on the remote sensing image features aims at terrain mapping requirements of wide distributed shallow sea sand wave terrain areas. Sand wave textures and sand wave crest lines in the remote sensing image are served as reference control information to lead into the multi-beam sounding data terrain reconstruction. High-accuracy shallow sea sand wave area terrain can be reconstructed through the multi-beam sounding data, wherein the multi-beam sounding data are obtained in an interval type measuring line mode. The shallow sea sand wave area multi-beam sounding terrain reconstruction method based on the remote sensing image features is an innovation of a cross application aspect of remote sensing information technology and multi-beam sounding technology. The shallow sea sand wave area multi-beam sounding terrain reconstruction method based on the remote sensing image features has great practical values.

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.

Methods and systems are used for monitoring a global position or location of a prosthetic or orthotic device and to provide feedback control of the device. Certain methods may employ remote transmitting devices and receivers to recognize when a prosthetic or orthotic device user is in a moving vehicle and, therefore, initiate automatic shut-off, driving mode, or relaxed mode. Other methods may employ remote transmitting devices and receivers to identify the global position of the prosthetic or orthotic device, compare the global position to a stored terrain mapped database and output feedback control instructions and / or alerts to the prosthetic or orthotic device based at least in part on the stored terrain mapping information.

Methods and apparatus automatically determine a location, such as of an aircraft or spacecraft, by matching images of terrain below the craft, as captured by a camera, radar, etc. in the craft, with known or predicted terrain landmark data stored in an electronic data store. A star tracker measures attitude of the camera. Optionally, a rangefinder measures altitude of the camera above the terrain. A navigation filter uses the attitude, and optionally the altitude, to resolve attitude, and optionally altitude, ambiguities and thereby avoid location solution errors common in prior art terrain matching navigation systems.

The invention provides a global detection method of unstructured outdoor terrains in the technical field of robots. The method comprises the specific steps of image acquisition, image preprocessing, scene image segmentation, appearance characteristic extraction, terrain type judgment, terrain classifier candidate database establishment, current scene optimal classifier verification, terrain type statistical modeling, statistical model parameter training and statistical model reasoning. According to the global detection method, the navigation experience of different time points is integrated in principle, and the stability and the intelligence degree of terrain detection under the condition of uneven and even deficient view field samples are improved; a combined multi-layer sensor classifier adopted for the global detection method takes the uncertainty and the nonlinearity of the appearance-terrain mapping relation of the scenes into consideration, so that the accuracy of terrain detection can be improved; in addition, the space relations at variable scales in the current scene and the compatibility of types are modeled in principle, and the global detection of the unstructured outdoor terrains is realized.

A terrain mapping system is disclosed for a machine having at least one traction device. The system may have a sensor associated with the machine and configured to generate a signal indicative of a position of the machine. The system may also have at least one controller in communication with the sensor. The at least one controller may be configured to receive the signal from the sensor, and divide an area between the at least one traction device and a work surface into a plurality of virtual tracking features based on the signal and known geometry of the machine. The at least one controller may also be configured to track movement of the plurality of virtual tracking features, and update an electronic terrain map of a worksite based on the movement of the plurality of virtual tracking features.