306results about How to "Ensure positioning accuracy" patented technology

The invention provides location information management method, platform and system, and relates to the field of mobile communication. The location information management method for a mobile terminal comprises the steps of: sending a charging message including a user ID and base station ID information of the mobile terminal by a P-I gateway to an AAA server and the location management platform after the mobile terminal establishes PPP (Point-to-Point Protocol) connection with a network through the P-I gateway; obtaining the user ID and base station ID information of the mobile terminal by the location management platform from the received charging message; searching a geographical location description corresponding to the base station ID in a base station geographical database by the location management platform; binding the geographical location descriptions corresponding to the user ID and the base station ID by the location management platform, and storing in a user/location database for offering the location information of the mobile terminal for users requesting a location business. The invention can provide required user location information services for various applications requiring the location information.

A rear door that is provided in an openable and closable manner at a vehicle body rear portion, the rear door having: a frame portion that forms along an external edge of the rear door, a door windshield panel that is provided in the frame portion, and a lateral beam that spans between both lower end corner portions of the windshield panel, wherein at coupling portions of the frame portion and the lateral beam, the frame portion and the lateral beam each have a closed sectional structure, and the closed sections of the frame portion and the lateral beam are continuous.

The invention discloses a carrier phase ambiguity fixing method and device, and a satellite navigation receiver. The method comprises the following steps of: establishing an inter-receiver inter-satellite double-difference observation equation, wherein the unknown quantities of the inter-receiver inter-satellite double-difference observation equation include a single-frequency ambiguity and at least one wide-lane ambiguity; establishing a Kalman filtering observation model and a Kalman filtering dynamic model according to the inter-receiver inter-satellite double-difference observation equation; obtaining and solving multi-frequency-point real-time observation data according to a kalman filtering algorithm to obtain the floating point solutions of the wide-lane ambiguity and single-frequency ambiguity; subjecting the floating point solutions of wide-lane ambiguity and the single-frequency ambiguity to ambiguity of whole cycles fixing. The method and device can eliminate the influence of an ionosphere residual error, accurately and quickly solve the ambiguity, and thus guarantee positioning accuracy and shorten observation time.

The invention discloses a vehicle logo recognition method and system based on a selective search algorithm. The vehicle logo recognition method based on a selective search algorithm includes the steps: performing positioning of a license plate on an original vehicle image, and acquiring the position of the license plate; according to the position of the license plate, the spatial position relationship between the license plate and an vehicle logo, and the vehicle window edge information, performing coarse positioning on the vehicle logo in the original vehicle image, and obtaining an vehicle logo coarse positioning image; based on a central axis of the vehicle, selecting a vehicle logo candidate area in the vehicle logo in the original vehicle image; using a selective search algorithm to perform target positioning on the vehicle logo candidate area, and obtaining a positioning target set; utilizing a linear constraint coding algorithm to train a vehicle logo determination classifier to perform determination on the vehicle logo for the positioning target set to obtain the position of the vehicle logo; and utilizing the linear constraint coding algorithm to train a multi-type vehicle logo recognition classifier to perform concrete type recognition on the vehicle logo, and obtaining the vehicle logo recognition result. The vehicle logo recognition method and system based on a selective search algorithm have the advantages of extensive applicability, high robustness and high detection speed, and can be widely applied to the image processing field.

A plate member constituting a channel unit of an ink jet recording head has a metal plate which is produced by rolling an etchable material, and a polymer film which is laminated onto one face of the metal plate. The long side is perpendicular to the rolling direction of the metal plate. Warpage which easily occurs in the longitudinal direction is suppressed by the rigidity which is large in a direction perpendicular to the rolling direction.

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 multipoint positioning auxiliary device. The multipoint positioning auxiliary device comprises a cylindrical base and a cylindrical indexing and positioning mechanism on the base. The indexing and positioning mechanism comprises an indexing disc and an aligning disc which can rotate relatively, the aligning disc is provided with a hemispherical positioning base, the positioning base is provided with a cross positioning groove penetrating through the hemisphere, a positioning wing groove is formed in the position, corresponding to the notch of the cross positioning groove, of the aligning disc, a spherical positioning groove is formed in the centre of sphere of the positioning base, a universal ball connected with a cylindrical scale pole is embedded in the spherical positioning groove, a positioning rod and a positioning wing are arranged between the universal ball and a scale pole body in sequence, the positioning rod is matched with the cross positioning groove, the section of the positioning rod is square, the positioning wing is matched with the positioning wing groove, and a positioning vernier which can slide along the scale pole body is arranged on the scale pole. The multipoint positioning auxiliary device has the advantages of being simple in structure, accurate in positioning, convenient to operate, store and carry and the like, multipoint positioning can be achieved conveniently and rapidly, operation is simplified, and working efficiency is improved.

The invention provides a method and system for tracking an underwater robot in real time, and unmanned relay equipment, and relates to the technical field of marine equipment. The unmanned relay equipment comprises the following parts of an underwater acoustic communication device for communicating with the underwater robot; an underwater robot positioning device for positioning the underwater robot equipped with an acoustic beacon; a satellite communication positioning device for satellite communication with a mother ship or a shore-based accusation tower, and for calculating real-time latitude and longitude; an inertial navigation device for providing a three-degree-of-freedom attitude angle and three-degree-of-freedom axial acceleration information; an autonomous control unit for receiving azimuth and distance data of the underwater robot calculated by the underwater robot positioning device, receiving the motion state data provided by the satellite communication positioning deviceand the inertial navigation device, calculating a navigation trajectory according to each received data and performing thrust distribution; and a power and propulsion device for receiving thrust distribution information and propelling the unmanned relay equipment to sail according to the navigation trajectory.

The invention relates to a method for obtaining a microearthquake wave velocity based on a space geometry relationship. The method comprises the following steps: constructing an inequation of microearthquake equivalent wave velocity V according to the space geometry relationship of an earthquake focus point and a base station, constructing a regularly changing time difference fitness function shaped like a quadratic function with an upward opening, proposing a monotonous unidirectional searching algorithm, and resolving an optimum wave velocity. The method perfectly solves the problem that a velocity model in microearthquake positioning is inaccurate or non-unique, and does not need any prior engineering experience; the microearthquake wave velocity can be quickly and precisely solved according to the observation data of sensors for microearthquake arrival time, so that the positional accuracy of a microearthquake positioning algorithm in a later period is guaranteed, the rate of convergence and the stability of the algorithm are improved, and the method has an extremely high practical engineering application value.

The invention relates to a full closed-loop control method for multi-shaft linked dynamic correction of interpolation positions. The full closed-loop control method for multi-shaft linked dynamic correction of the interpolation positions comprises adjusting command positions of shafts on a first command position coordinate according to collected deviation between actual positions of the shafts and a motor; performing projection of adjusted command position vectors of the shafts on a machined track, obtaining a projection length and confirming corrected command positions; stopping adjusting when a full closed-loop condition is satisfied; performing speed connection processing on a movement segment and a next movement segment when a program segment is in parallel connection and provided with follow-up movement segments; not adjusting the interpolation positions until interpolation of the current movement segment is not achieved if the full closed-loop control condition is not satisfied and enabling the actual positions of the shafts to be moved to the command positions through a PID (Proportion Integration Differentiation) control algorithm within the positioning duration which is provided through a system. The full closed-loop control method for multi-shaft linked dynamic correction of the interpolation positions has the advantages of satisfying the multi-shaft linked profile accuracy, the positioning accuracy and the repositioning accuracy, meanwhile guaranteeing stabile operation of a servo motor, guaranteeing workpiece machining accuracy and prolonging the service life of machine tools.

The invention discloses a positioning circuit based on Bluetooth AOA communication, a positioning system based on Bluetooth AOA communication and a positioning method based on Bluetooth AOA communication. The positioning circuit comprises a radio frequency communication module, a switch switching module, a Bluetooth communication module, a calibration compensation module and a positioning controlmodule. The switch switching module outputs a driving signal according to the control signal and the radio frequency signal. The plurality of antenna units are respectively located at preset positionsand are driven by the driving signal to sequentially receive the first Bluetooth communication signal. The calibration compensation module calibrates the communication state of each antenna unit to obtain a corresponding phase compensation value. The positioning control module obtains an angle value and a distance value of the to-be-tested equipment according to the phase difference of the multiple paths of first Bluetooth communication signals after phase compensation so as to complete a positioning function on the to-be-tested equipment. The positioning circuit directly obtains the positionof the to-be-measured equipment according to the phase difference, thereby saving the intermediate variable, simplifying the positioning measurement steps, and improving the positioning precision andpositioning efficiency.

The invention relates to the field of unmanned aerial vehicles, and discloses an unmanned aerial vehicle autonomous landing method based on visual identification. The method comprises the steps of binocular camera correction and calibration, landing landmark selection, close-range landing landmark positioning and long-distance landing landmark positioning. According to the unmanned aerial vehicleautonomous landing method based on visual identification, the calibration process is simplified, the calibration precision is improved, and the positioning precision is guaranteed; and threshold segmentation is performed on an image by adopting a maximum between-cluster variance method, the threshold can be adaptively determined, calculation is facilitated, and two algorithms of short-distance landing landmark positioning and long-distance landing landmark positioning are respectively designed according to the distance between the unmanned aerial vehicle and the landing landmark, so the positioning precision of the unmanned aerial vehicle during autonomous landing is higher, and the risk of air crash caused by inaccurate positioning is reduced.