304results about How to "Ensure positioning accuracy" patented technology

The invention discloses a multi-AUV self-adaptive target searching and obstacle avoidance method oriented to an unknown environment, and the method is suitable for multi-AUV target searching under anunknown complex underwater environment. The method is mainly divided into three modes including a target mode, a non-target mode, and an obstacle avoidance mode. In the target mode, the self-adaptivesearching is achieved through dynamic real-time prediction according to the target information for sensing the outside; in the non-target mode, full-area coverage searching and collaborative planningtasks are achieved through a sub-area strategy; and in the obstacle avoidance mode, the barrier threat is avoided in real time based on the improved dynamic window method. According to different underwater environment information, a multi-AUV target searching task is executed through alternate mode switching among the three modes, and the uncertain information under the unknown water can be dealtwith, the credible interval of the target state information is guaranteed, and environment adaptability and searching efficiency are achieved.

The invention discloses an improved position fingerprint indoor positioning method. The method comprises an offline stage and an online stage. The method is characterized in that the offline stage comprises the steps of establishing a position fingerprint database by use of reference points and APs, and classifying data in the fingerprint database through a K-means clustering algorithm and obtaining the class cluster to which the to-be-tested point belongs; and the online stage comprises the steps of matching the to-be-tested point with the fingerprint of the class cluster by use of a Bayesian probability algorithm, thereby calculating the position coordinate of the to-be-tested point. According to the improved position fingerprint indoor positioning method, the K-means clustering algorithm is combined with the Bayesian probability algorithm; the data in the fingerprint database is classified by use of the K-means clustering algorithm, thereby obtaining the class cluster to which the to-be-tested point belongs; therefore, the target range is greatly reduced; the to-be-tested point is matched with the fingerprint of the class cluster by use of the Bayesian probability algorithm; and therefore, according to the position fingerprint positioning algorithm, the positioning precision is ensured, the complexity of the algorithm is reduced, the efficiency is improved, and the algorithm has practical value.

The invention discloses a portable vehicle recognition device base on an embedded platform, belonging to the technical field of traffic and vehicle management. A camera, a display or a touch screen, a wireless transmission (GPRS) module, a radio frequency identification card (RFID) reader, a global positioning (GPS) module are arranged on the embedded platform to form a portable device which integrates set data acquisition, data display, data processing, self location, data transmission and communication function as a whole, so that the recognition of licence plate images comprising five key links, such as image acquisition, image preprocessing, licence plate location, character segmentation and character recognition is realized, and the image acquisition and processing are directly completed in the portable device. The device has the advantages of convenient carrying, rapid location, high flexibility, high efficiency, high accuracy, high reliability, low cost and high quality, and is recommended to be used in the field of traffic and vehicle management.

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 method for using a mobile reference station in network RTK to enhance the positioning effect. When faults such as abnormal ionospheric activities or faults in the reference station in the domain occur within the service range of the network RTK, temporarily set up a mobile reference station in the fault area. The mobile reference station without precise coordinates uses the GNSS observation data obtained by the mobile reference station to obtain and refine the atmospheric correction information of the fault area, and then correct the differential correction information broadcast by the data processing center to mobile users, thereby ensuring network RTK positioning Service accuracy and reliability, improve system availability.

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 Mcpherson suspension connecting structure which comprises a damper, an upper transverse arm, a steering knuckle, a lower control arm lever and a damper mounting bracket, wherein the lower control arm lever further comprises a front control arm lever and a rear control arm lever, the lower end of the steering knuckle is in mounting connection with the front control arm lever and the rear control arm lever by a ball pin connecting way, and a connecting ball pin can slide at the connected parts of the steering knuckle as well as the front control arm lever and the front control arm lever. Based on the traditional Mcpherson suspension structure form, the Mcpherson suspension connecting structure realizes the kingpin inclination angle to be adjustable by changing the connection mode between the steering knuckle and the lower control arm lever, ensures that a suspension platform has stronger adaptability, is convenient for the chassis adjustment at the later stage, has the positioning precision under the control of assembly, is more guaranteed than the current unadjustable Mcpherson suspension, and can balance the steering force and the steering according to actual situations.

A ring-shaped connecting portion is formed on a seat surface side of a pipe connector. The connecting portion is tapered so that thickness thereof gradually reduces toward a tip end thereof. A protrusion is formed on the tip end of the connecting portion. A ring-shaped groove is formed on a flat outer peripheral surface of a common rail. By fitting the protrusion into the groove, the connector can be positioned to a predetermined position of the common rail. In this structure, current can be concentrated to the protrusion and current density can be increased. As a result, sufficient bonding strength can be attained.

The invention discloses a method for real-time detection of falling from bed behaviors based on depth image information. The method includes the following steps: (1) a depth sensor acquiring a depth image of the indoor scene; (2) updating a tracking region of the depth image; (3) through a continuously changing offset dimension, extracting eight neighborhood differential characteristics of each pixel in the tracking region; (4) acquiring a head region; (5) positioning the center of the head region; (6) acquiring an above the waist region; (7) optimizing head positioning; (8) determining human body;(9) extracting height characteristics; (10) detecting falling from bed: adopting a well-trained falling from bed classifier to conduct classification detection on the height characteristics to acquire a falling from bed detection result. According to the invention, the method uses a random forest classifier to acquire the head region, and optimizes head positioning, which guarantee positioning accuracy, and also uses a support vector machine to detect falling from bed, which guarantees higher accuracy and robustness.

The invention discloses a smart city management platform for realizing accurate positioning of a user. The smart city management platform includes eliminating abnormal data; identifying road users asfast-speed users, users waiting for traffic lights, and users with similar tracks on roads; identifying an indoor user; determining a range of grids required to be divided, and dividing the grids according to a set size; dividing sub-grids of all indoor attributes and sub-grids of road attributes; matching the data points with the attributes with the grids, and enabling the data points to fall into the corresponding grids; classifying users with user groups and similar signal characteristics into one class according to the signal characteristics; extracting features in each area and corresponding feature values; the fingerprint database is automatically updated in real time; and carrying out matching calculation on the characteristics and the corresponding characteristic values of the MR original data points and the characteristics and the characteristic values of the uniquely identified area in the fingerprint database, and returning corresponding longitude and latitude information inthe fingerprint database. Accurate positioning can be realized, and a basis is provided for subsequent decision making.

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.

The invention relates to a handling device combining at least one trailer (100) that can be hitched to a tractor vehicle and/or to other trailers to form a carriage train and at least one bed (300) for bearing the load (C), notable in that the trailer (100) comprises running means (110) supporting a chassis (120) equipped with a module (200) for loading and unloading the bed (300) that bears the load (C) combining means for the motorized movement of the bed and means for positioning said bed (300) so that the bed (300) is no longer in contact with the ground and is held in position on the trailer (100).