65results about How to "Continuous positioning" patented technology

The present invention relates to a light-emitting device including a light source, a first light-emitting material spaced apart from the light source, and at least one additional light-emitting material. The first light-emitting material includes low reabsorbing semiconductor nanocrystals having an emission-center core, an exterior protective shell, and at least one inner light-absorbing shell. The device is useful for efficiently producing white light having a high color rendering index.

The invention discloses a VHF (very high frequency) frequency-range intracloud lightning detecting and positioning system, which comprises a central treatment station and a plurality of detection and treatment sub-stations arranged in different positions, wherein the detection and treatment sub-stations and the central treatment station are accessed into a public wide area network in a wired or wireless mode; and through the wide area network, on one hand, obtained intracloud lightning detection data is uploaded to the central treatment station by the detection and treatment sub-stations, andon the other hand, the working state of each detection and treatment sub-station is remotely monitored by the central treatment station. The system can be used for precisely estimating the incidence directions of lightning radiation signals of a plurality of simultaneously occurring lightning radiation sources or the same lightning radiation source arriving at the detection sub-stations through different propagation paths, the arriving time difference of the lightning signals between any two detection and treatment sub-stations is calculated at the central treatment station (TDOA estimation),and the spatial position of an intracloud lightning radiation source is determined by DOA and TDOA information.

A bone anchoring device is provided that includes an anchoring element with a shank to be anchored in a bone or a vertebra, a connection element for connecting at least two anchoring elements, the connection element being made of an elastic material, a receiving part being connected to the shank for receiving the connection element and connecting the connection element to the shank, a seat for the connection element the seat being provided in the receiving part, and a locking element being engageable with the receiving part for fixation of the connection element in the seat. At least the portion of the connection element which is received in the recess has a substantially smooth-surface. The locking element has an engagement structure which contacts the surface of the connection element in such a way that a form-fit connection is provided.

The invention provides a three-dimensional positioning and attitude-determining method and a system for a track detection platform in a dynamic environment. The method comprises the steps of calibrating the relative spatial positions and attitudes of the left and right cameras of a binocular stereo camera; calibrating the relative position and attitude parameters of the binocular stereo camera relative to the laser inertial navigation; taking the photos of a CPIII control point by means of the binocular stereo camera to obtain multiple photos of the control point; obtaining the position and the attitude of the binocular stereo camera through the stereo intersection process; adopting the position and the attitude of the binocular stereo camera as weighted observation values and inputting the weighted observation values into an INS/OD navigation system for filtering, smoothing and interpolating treatments so as to obtain the positioning and the attitude of the track detection platform. According to the technical scheme of the invention, the data of a track line high-precision control network and the data of an inertial navigation meter /speedometer are fused based on visual techniques, and the combined resolving method is adopted. In this way, the continuous and high-precision positioning and attitude-determining effect of the dynamic track detection platform is realized. The method and the system can be widely applied to the track detection of high-speed rails and subways, and the mobile road measurement.

The invention discloses a method for tracking an extended target by multiple sensors with partially overlapped monitoring areas. A Gaussian component which is used when a current measurement set is subjected to wave filtering serves as a Gaussian component which is predicted at a current moment rather than a Gaussian component after the measurement of any one sensor is updated, so that the results of the sensors after wave filtering updating are mutually independent; after the measurements of all sensors participate in the wave filtering updating, Gaussian items in the results of all the sensors are judged: if a component representing a target position in the Gaussian item estimated by the sensor falls into an overlapping area, the weight value of the component is subjected to averaging optimization treatment; finally, the weight values, the average values and the covariances of the Gaussian items estimated by all the sensors are combined into one Gaussian component which serves as the Gaussian component predicted at a next moment. By using the method for tracking the extended target by the multiple sensors with the partially overlapped monitoring areas, which is provided by the invention, the problem that a target quantity is over-estimated due to the overlapping areas and the problem that measurement information is seriously lost due to non-overlapping areas are solved.

The invention discloses a highly reliable fused vehicle positioning method in the vehicle and road coordinated scene, and aims at solving the problems that vehicle satellite navigation in the urban environment tends to be limited and is low in positioning accuracy and reliability. On the basis of traditional vehicle-mounted satellite and inertia combined navigation, the UWB positioning technologyis introduced, UWB nodes are laid reasonably, and an NLOS (Not Line of Sight) error processing algorithm is combined, so that an observed UWB value error is reduced. Further, fused vehicle positioningis realized on the basis of an expanded Kalman filtering algorithm. Compared with the traditional vehicle-mounted satellite and inertia combined navigation, the method is high in reliability in the urban environment especially in the complex environment that satellite signals are shielded (as in a canyon or crossing), and the vehicle can be positioned continuously, completely and reliably in realtime.

The invention provides a terrain auxiliary navigation method based on mixture of a terrain contour matching (TERCOM) algorithm and particle filtering, aiming at solving the problems of large initial position error and the diffusing of a wave filter when an aircraft flies at high maneuverability in a flat terrain region. The navigation method comprises a searching mode, a tracking mode, a losing mode and mode logical shift. In the searching mode, measurement information is processed in batches respectively by a mean absolute deviation (MAD) algorithm, a mean-square deviation (MSD) algorithm and a cross correlation (COR) algorithm, and initial positioning is quickly and exactly realized under the large initial position error according to a consistent voting algorithm; under the tracking mode, the measurement information is processed in a recurrence way by means of particle filtering, and the continuous matching and position can be realized under the tracking mode; and the searching mode is shifted into the tracking mode after the initial positioning is realized by the losing mode and the mode logical shift, and the tracking mode is shift to be the searching mode after pseudo positioning exists. The continuous positioning under the large initial position error can be guaranteed to be stably and reliably realized.

The invention relates to a Beidou/GPS dual-mode navigation positioning device and method, and the method comprises the steps: receiving a Beidou/GPS satellite signal, and reading satellite data; analyzing and calculating the satellite data, obtaining a first Beidou/GPS difference correction number, and storing the first Beidou/GPS difference correction number at a reference station; receiving a Beidou/GPS satellite signal and reading the satellite data; carrying out the analyzing and calculation of the satellite data, and obtaining a second Beidou/GPS difference correction number; carrying out the matching and correction of the first and second Beidou/GPS difference correction numbers, obtaining a corrected Beidou/GPS difference correction number, carrying out the position analysis, and carrying out the dual-mode positioning; and enabling an airborne moving station to carry out the continuous positioning. Compared with the prior art, the method can improve the positioning speed and precision. The method also can achieve the continuous positioning under the condition of no satellite signal, and improves the positioning precision.

The invention relates to a thermo-forming packaging machine and a method which are characterized in that the location of trays in a base film upstream of a sealing station is detected by a measuring system and that the sealing station is immediately subsequently positioned such as to allow a top film to be sealed with highest accuracy matching the tray and thereby to be able to compensate for irregularities and tolerances, for example, in the film feed, in a true-to-cycle manner.

The invention relates to a method for contactless recording of a track geometry of a track by means of a rail vehicle which is moved along the track on on-track undercarriages (4), wherein profile data of the track extending in transverse direction are compiled by means of a laser scanner. In this, it is provided that, by means of an evaluation device, profile data are evaluated relative to a reference base pre-defined on the rail vehicle in order to derive from this the course of a track central axis and/or a rail. The invention additionally relates to a rail vehicle which comprise an evaluation device configured for carrying out the method. Thus, no further measuring system is required to determine a track position.

The invention discloses a construction method of a visual point cloud map. The method includes the steps of: carrying out feature extraction on an acquired source image frame of the space of the to-be-built map; obtaining a source image frame feature point; performing inter-frame tracking on the source image frame; determining key frames, matching the feature points in the current key frame with the feature points in the previous key frame; obtaining matching feature points of the current key frame, calculating spatial position information of the matching feature points in the current key frame, taking the spatial position information of the matching feature points as map point information of the current key frame, and taking point cloud formed by map point sets of all key frames as a first visual point cloud map. According to the method, mapping and positioning are separated in the map construction process, the mutual influence of mapping and positioning is effectively removed, and the method has better adaptability and stability in a complex and changeable environment.

The present invention discloses a method for meter location based on fusion of the reverse RTD (Real Time Differential) and the pedestrian dead reckoning. The method comprises the following steps: a central server performs real-time decoding of RINEX binary data uploaded by a base station to perform base station satellite position calculation and obtain the observation satellite coordinates of a current epoch; the received original observation data uploaded by a moving station and the decoding data of the base station are subjected to data preprocessing; the time correlations of the observation epochs of the base station and the moving station are matched, pseudo-range difference location or difference is selected according to a matching result to calculate the coordinates of the moving station, and the meter location precision is obtained; and the obtained three-dimensional coordinates of the moving station are converted to a BLH, a standard GGA is generated, and the real-time continuous location of the moving station is completed. Further, the present invention provides a system for meter location based on the method provided by the invention. The method and system for meter location based on fusion of reverse RTD and pedestrian dead reckoning can realize continuous real-time location of the moving station in a complex environment and obtain meter location precision.

The invention relates to the technical field of indoor positioning, in particular to a high-precision indoor three-dimensional positioning method based on UWB (ultra-wideband), optical flow and inertial navigation. The method comprises the steps of performing error compensation on an accelerometer and a gyroscope to complete initial alignment; entering a navigation stage, performing navigation calculation on parameters measured by the accelerometer and the gyroscope in real time to obtain real-time speed, position and attitude information of a carrier, and constructing a measurement matrix with ultra-wideband UWB positioning information and speed information of an optical flow sensor; constructing a state equation of indoor three-dimensional positioning of the carrier, and solving the state equation according to a Kalman filtering algorithm and measurement matrixes at different moments to obtain estimated values of the state matrixes at different moments, wherein the estimated values are indoor three-dimensional positioning information of the carrier. Through the method disclosed by the invention, full-autonomous indoor navigation can be realized, the required base stations can begreatly reduced in comparison with the indoor positioning of Bluetooth beacons, and the base arrangement can be greatly reduced in comparison with pure UWB indoor positioning, and the positioning is more continuous.

The invention discloses a two-dimensional vehicle positioning method in a tunnel environment and based on radio frequency identification. A radio frequency identification (RFID) technology is adopted in the urban tunnel environment and combined with an RFID positioning algorithm and a constrained optimization algorithm to position a vehicle, so that accuracy of vehicle positioning is improved, and two-dimensional position information of the vehicle in the tunnel environment can be accurately estimated in real time. The two-dimensional vehicle positioning method has the remarkable advantages of being high in positioning speed and accuracy, good in real-time performance and the like.

A method for installing a plurality of rotor blades to a rotatable hub secured atop a tower of a wind turbine includes providing a counterweight assembly having, at least, an arm member and a counterweight mass secured at a distal end of the mounting assembly. The method also includes securing the arm member of the counterweight assembly to the hub of the wind turbine. Further, the method includes consecutively installing the plurality of rotor blades onto the hub of the wind turbine. Moreover, the method includes rotating the arm member about a rotation axis of the hub to continuously adjust a position of the counterweight mass between each consecutive installation of the plurality of rotor blades to change a center of gravity of the hub and maintain a balanced rotor of the wind turbine during installation of the plurality of rotor blades.

A magnetic recording medium has a substrate, and a servo signal recording magnetic layer whose magnetization is oriented in a direction perpendicular to a surface thereof, a non-magnetic layer and a data recording magnetic layer, which are stacked on the substrate in the order mentioned. The servo signal recording magnetic layer has a coercivity higher than that of the data recording magnetic layer. The servo signal recording magnetic layer has servo tracks formed with a track pitch Tps, the servo tracks adjacent to each other in a track width direction being magnetized to opposite directions perpendicular to the film surface.