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1089 results about "Low altitude" patented technology

Full-automatic unmanned aerial vehicle control system

The invention relates to the field of unmanned aerial vehicles, in particular to a full-automatic unmanned aerial vehicle control system. The system, which is characterized in that: a ground control system comprises a main control system mainly comprising a central controller, a main control computer, the internet network and a central antenna, a user computer as a human-computer interactive interface, and a GPS navigation system; a vehicle-mounted flight control system of the unmanned aerial vehicle is provided with an aerial vehicle controller, a networking antenna, a GPS antenna, a DSP, a navigation camera, and a sensor; and the main control system of the ground control system gets the remote internet control authority, the main control computer inputs a signal to the central controller, the signal is processed by the central controller, and then the remote wireless communication and control of the vehicle-mounted flight control system are achieved through the antennas. Compared with the prior art, the system has the advantages of having high automation degree, realizing various flight missions of the unmanned aerial vehicle, and being applied to low altitude remote sensing, aerial photography, monitoring, photography measurement, videography, communication data retransmission and the like.
Owner:孙卓

Unmanned aerial vehicle aerial photography sequence image-based slope three-dimension reconstruction method

InactiveCN105184863AReduce in quantityReduce texture discontinuities3D modellingVisual technologyStructure from motion
The invention relates to an unmanned aerial vehicle aerial photography sequence image-based slope three-dimension reconstruction method. The method includes the following steps that: feature region matching and feature point pair extraction are performed on un-calibrated unmanned aerial vehicle multi-view aerial photography sequence images through adopting a feature matching-based algorithm; the geometric structure of a slope and the motion parameters of a camera are calculated through adopting bundle adjustment structure from motion and based on disorder matching feature points, and therefore, a sparse slope three-dimensional point cloud model can be obtained; the sparse slope three-dimensional point cloud model is processed through adopting a patch-based multi-view stereo vision algorithm, so that the sparse slope three-dimensional point cloud model can be diffused to a dense slope three-dimensional point cloud model; and the surface mesh of the slope is reconstructed through adopting Poisson reconstruction algorithm, and the texture information of the surface of the slop is mapped onto a mesh model, and therefore, a vivid three-dimensional slope model with high resolution can be constructed. The unmanned aerial vehicle aerial photography sequence image-based slope three-dimension reconstruction method of the invention has the advantages of low cost, flexibility, portability, high imaging resolution, short operating period, suitability for survey of high-risk areas and the like. With the method adopted, the application of low-altitude photogrammetry and computer vision technology to the geological engineering disaster prevention and reduction field can be greatly prompted.
Owner:TONGJI UNIV

Quick low altitude remote sensing image automatic matching and airborne triangulation method

The utility model relates to a method of rapid automatic matching for the low altitude remote sensing image and the aerial triangulation, which is characterized in that: capture serial images with the low altitude remote platform; extract the characteristic point from the image with the feature extraction technology; save automatically all extracted characteristic points of the images; match automatically characteristic points with same name of the adjacent images and transmit automatically the matched characteristic points with same names to all superimposed image to obtain a large quantity of characteristic points with three degree or more and same names; the semi-automatic measurement control point and the checkpoint of the image coordinate can combine with other observation values of non-photogrammetry to carry out the high precision aerial triangulation and the precision evaluation of the balancing results. The utility model has the advantages that the stable and reliable matching results and higher precision of the aerial triangulation can be obtained even the low altitude remote sensing images have large rotation deviation angle and the applicative demand of the large scale survey and the high precision three-dimensional reconstruction can be met.
Owner:WUHAN UNIV

Multipath resolving correlation interferometer direction finding

Apparatus and a method utilizing correlation interferometer direction finding for determining the azimuth and elevation to an aircraft at long range and flying at low altitudes above water with a transmitting radar while resolving multipath signals. The signals from the radar are received both directly and reflected from the surface of the water using horizontally polarized and vertically polarized antenna arrays, are digitized and are stored in separate covariant matrices. Eigenvalues for the eigenvectors of the matrices processed on signal samples recorded on horizontally polarized X arrays are compared to the eigenvalues for the eigenvectors of the covariance matrices processed on signal samples recorded on vertically polarized X arrays. Incident field polarization is associated with the antenna array measurements that yield the strongest eigenvalue. The eigenvector and eigenvalues for the strongest signal are selected and used for subsequent signal processing. An initial global search assuming mirror sea-state reflection conditions using the signal eigenvector having the strongest eigenvalue is performed to yield an approximate elevation α and azimuth β to the aircraft. The approximate values are then used as the starting point for a subsequent conjugate gradient search to determine accurate elevation α and azimuth β to the aircraft.
Owner:BAE SYST INFORMATION & ELECTRONICS SYST INTERGRATION INC

Small low-altitude light area array laser radar measuring system

The invention discloses a small low-altitude light area array laser radar measuring system. The master control sub-system of the measuring system triggers a pulse laser emitting module to emit lasers, the lasers are collimated and generate two paths of laser signals through a beam splitting sheet, one path is used for determining the time of emitting the lasers and generating timing starting signals, the other path irradiates an object through beam expansion, echo signals are received by an APD array detection module and generate N2 paths of stopping pulses, and a multi-channel high-precision time interval measuring module is combined with starting signals to measure the round-trip flight time difference of N2 paths of lasers of a rectangular detection area. The location attitude measuring sub-system, the master control sub-system and the area array laser radar distance-measuring sub-system of the measuring system are integrated, original three-dimensional information can be obtained in real time, and assembling and verification are eliminated. The laser radar measuring system does not need scanning, three-dimensional imaging can be achieved through a single pulse, the imaging speed is high, measuring precision and working efficiency are high, the size is small, the weight is small, and the small low-altitude light area array laser radar measuring system is suitable for being carried small low-altitude light remote sensing platforms.
Owner:GUILIN UNIVERSITY OF TECHNOLOGY

Path planning method of passable area divided at unequal distance

The invention belongs to the technical field of path or flight path planning of robots as well as low-altitude flight aircrafts, specifically relates to a path planning method of a passable area divided at unequal distance, and is used for solving the problem that existing planning algorithm has large time complexity in time and space complexity. The path planning method comprises the following steps of: calculating convex extreme points of each barrier curve; dividing the passable area by using each convex extreme point as a horizontal line; abstracting each small area obtained by dividing into a peak of a graph; forming an undirected graph by all peaks; finding out a peak serial number corresponding to the small area at which a starting point and a final point are located; finding out all paths for the undirected graph by breadth-first or depth-first scanning; finding out an actual to-be-travelled path of a moving object according to the situation on an actual map. The path planning method disclosed by the invention has the beneficial effect of overcoming the problems of algorithms of A* and the like on memory space and operation time, and overcoming a convergence problem of an ant colony algorithm at the same time. Besides, time complexity and space complexity are improved greatly in comparison with other algorithms.
Owner:ZHONGBEI UNIV

Low-altitude airship flight control system and flight control method thereof

The invention discloses a low-altitude airship flight control system and a flight control method thereof, belonging to the technical field of aircraft control. The system comprises a front-end data acquisition and processing subsystem, a navigation and flight control and state monitoring subsystem, a rear-end driving execution module subsystem and a flight application subsystem, wherein the front-end data acquisition and processing subsystem is connected with sensing equipment and used for transmitting acquired flight environment and airship state information, the navigation and flight control and state monitoring subsystem is connected with an airship navigation sensor and the rear-end driving execution module subsystem and used for transmitting navigation and flight control information,the rear-end driving execution module subsystem is connected with an airship execution controller and used for transmitting empennage steering engine pulse width modulation signals, propelling rotating speed control voltages and valve blower switch information, and the flight application subsystem is connected with a ground station and used for transmitting flight control instructions and telemetry parameter information through a data radio. The low-altitude airship flight control system disclosed in the invention is suitable for various civil and military systems.
Owner:SHANGHAI JIAO TONG UNIV

Low-altitude autonomous navigation system for rotary-wing unmanned plane

The invention discloses a low-altitude autonomous navigation system for a rotary-wing unmanned plane. The low-altitude autonomous navigation system is composed of a data acquisition device, a data preprocessing module, a data fusion module, a guidance control loop module and an attitude control loop module. The data preprocessing module is used for carrying out sampling filtering and error compensation on current location data information collected by the data acquisition device; the data fusion module is used for carrying out fusion and updating and obtaining a current position and speed of the rotary-wing unmanned plane; the guidance control loop module is used for calculating an expected attitude angle and an expected height value; and the attitude control loop module is used for generating a controlled quantity. According to the technical scheme, a problem of poor attitude estimation precision of the conventional navigation system can be solved; and requirements of high-precision heading attitude calculation and position and speed fusion of the rotary-wing unmanned plane can be met. High-precision filtering of the system is realized. On the basis of the analysis and calculation of the autonomous navigation system, the flight route and height can be corrected and the flight attitude can be adjusted autonomously; and the autonomous flight of the unmanned plane can be realized.
Owner:NORTHEAST AGRICULTURAL UNIVERSITY

Automatic lane line identification method based on low-altitude aerial images

The invention provides an automatic lane line identification method based on low-altitude aerial images. The automatic lane line identification method based on the low-altitude aerial images is applied to the field of intelligent transportation. The automatic lane line identification method based on the low-altitude aerial images comprises the steps that (1) an original image of a road is collected through low-altitude aircrafts, and the situation that the shooting angle of the aerial photography road is in the horizontal direction, and the area of the road is arranged in the middle of the image is ensured; (2) the collected image is converted into a grayscale image, the contrast ratio is improved, the grayscale image is copied, and an edge detection image and a binarization image are obtained according to the grayscale image; (3) connected areas are detected in the edge detection image and the binarization image, and characteristics of the connected areas are recorded; (4) the connected areas are deleted according to the number of pixels of the connected areas, the number of connected boundaries, the size of a bounding rectangle and variance values to obtain a central road line; (5) search is carried out on the two sides of the central road line to find roadside lane lines. The automatic lane line identification method based on the low-altitude aerial images is easy and convenient to calculate, and high in arithmetic speed and reliability, the road portion in an aerial photography video can be effectively extracted, straight roads and curve roads in the aerial images can be detected, and the automatic lane line identification method based on the low-altitude aerial images cannot be disturbed by background changes, and is high in accuracy.
Owner:BEIHANG UNIV

Drone's low-altitude remote-sensing image high-resolution landform classifying method based on characteristic fusion

The invention discloses a drone's low-altitude remote-sensing image high-resolution landform classifying method based on characteristic fusion. The method comprises the following steps: selecting common and representative landforms from to-be-processed remote sensing images and using them as the training samples of the landforms; extracting the color characteristics and the texture characteristics from the training samples of each landform; fusing the color characteristics and the texture characteristics; using a classifying method to classify and learn the fused characteristics to obtain the classifying model for each landform; extracting and fusing the color characteristics and the texture characteristics of the low-altitude remote sensing images of the to-be-classified drones; and finally, based on the fused characteristics of the classifying objects and in combination with the classifying model of each obtained landform, using the classifiers to divide the classifying objects into a certain landform. Therefore, the classification of the drone's low-altitude remote sensing images is achieved. According to the method of the invention, it is possible to more effectively and more quickly to extract the verification characteristics so that the classification result becomes more accurate.
Owner:CHONGQING UNIV

Flight monitoring service method and system thereof

ActiveCN105913692AEasy to monitorMake up for the blind spots of surveillanceAircraft traffic controlGround stationCivil aviation
The invention discloses a flight monitoring service method and a system thereof. The method is characterized by through a black box of a low altitude flight aircraft, acquiring a position and flight path information of an unmanned aerial vehicle; after carrying out correlation processing, using an unmanned aerial vehicle air traffic control system to send peripheral flight path information of the unmanned aerial vehicle to an unmanned aerial vehicle ground control station. The system comprises a civil aviation secondary radar, a low-altitude radar, radar access equipment, mobile acquisition equipment, an ADSB ground station, mobile conversion equipment, an automatic navigator, a GPS radio station, ADSC information conversion equipment, mobile communication equipment, a Big Dipper airborne navigator, a flight monitoring cloud server and a flight monitoring information application system. The method and the system of the invention have an advantage that dynamic data of an acquired unmanned aerial vehicle flight path, a state and the like can be taken as a monitoring information source and is transmitted to an air traffic control system currently used by military and civil aviation in real time so that a management department can conveniently monitor a flight state of a low altitude airspace unmanned aerial vehicle, and a blind area of current low-altitude spatial domain monitoring is compensated.
Owner:北京威胜通达科技有限公司

Guidance unmanned aerial vehicle net cast interception method for "low-altitude, slow-speed and small" target

The invention relates to a guidance unmanned aerial vehicle net cast interception method for a "low-altitude, slow-speed and small" target. The guidance unmanned aerial vehicle net cast interception method comprises the steps that an unmanned aerial vehicle is set as the standby state; a ground control station determines a threat target and controls photoelectric detection equipment to perform dynamic tracking on the threat target; the ground control station acquires the location of the threat target and transmits a flight instruction to the unmanned aerial vehicle; and the unmanned aerial vehicle enters the maneuvering flight mode and reaches the area near the target. When the distance between the unmanned aerial vehicle and the target is less than a first threshold, the unmanned aerial vehicle is controlled to accurately approximate the target through a visual guidance device and a distance measurement device. When the distance between the unmanned aerial vehicle and the target is less than a second threshold, a net cast device is automatically triggered to emit an interception net to wind the target to fall off and finally the unmanned aerial vehicle returns. With application of the method, the net cast device is automatically triggered to intercept the target according to the relative location information between the unmanned aerial vehicle and the target so that the interception precision and the degree of automation can be effectively enhanced.
Owner:BEIJING MECHANICAL EQUIP INST

Measurement and control communication method and system based on low-altitude unmanned aerial vehicle self-network

The invention provides a measurement and control communication method and a measurement and control communication system based on a low-altitude unmanned aerial vehicle self-network, which are wide in acting coverage range and can realize cooperative matching and dynamic stabilization. The method comprises the steps of performing self-network clustering on low-altitude unmanned aerial vehicles at different heights in different regions; respectively linking the low-altitude aerial vehicles to an airborne communication platform and a ground communication terminal by taking a cluster as a unit; regularly updating and maintaining clusters in the low-altitude unmanned aerial vehicle self-network. The system comprises the airborne communication platform and a plurality of low-altitude unmanned aerial vehicles; the space-based communication platform is communicated with the low-altitude unmanned aerial vehicles, the ground communication terminal and other airborne communication platforms; the low-altitude unmanned aerial vehicles carry task loads and are used for being communicated with the airborne communication platform, the ground communication terminal and other low-altitude unmanned aerial vehicles. The airborne communication platform and all the self-networked low-altitude unmanned aerial vehicles are organized to form a two-layer composite three-dimensional information network. Therefore, the integral efficiency of the system is improved, and the stability is high.
Owner:NO 63655 TROOPS OF THE CHINESE PEOPLES LIBERATION ARMY
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