788results about How to "Improve positional stability" patented technology

The invention discloses a pointer instrument reading identification method. The method comprises the steps of extracting a dial plate, removing interference, and correcting the dial plate by using affine transformation; performing circle detection and straight line detection on the dial plate to obtain predicted circle center and pointer angle; based on features of a scale connected domain on thedial plate, screening out the scale connected domain, performing linear fitting on the scale connected domain, calculating an intersection point of every two fitting straight lines, and performing screening verification on a to-be-selected circle center by utilizing the predicted circle center and pointer angle to obtain the circle center of the dial plate, wherein a distance from the centroid ofthe scale connected domain to the circle center on the dial plate is the radius of the dial plate; and according to information such as the circle center of the dial plate, the radius of the dial plate, the straight lines of a pointer, extracting an arc scale bar of the dial plate, expanding the arc scale bar in a rectangular shape, then according to horizontal coordinate distribution of scale onthe rectangular scale bar, performing minimum and maximum scale detection, noisy point removal and scale insertion, and finally in combination with the pointer angle, calculating reading of the dial plate. The method is high in universality and high in timeliness; and the reading has relatively high accuracy.

The invention provides a method for realizing accurate train positioning by a GPS with the aid of a digital railway map. The train positioning method essentially comprises two subalgorithms, namely a GPS integrity monitoring algorithm and a train positioning calculating algorithm. The GPS integrity monitoring algorithm uses the establishment of a local coordinate system based on railways and transforms a WGS-84 coordinate to a new local coordinate system based on railways as well as uses geographic information provided by the digital railway map to establish a redundancy equation and a constraint condition so as to monitor the pseudo-range observed quantity of the GPS; the train positioning calculating algorithm is responsible for establishing a train position calculating model and a speed calculating model and integrating the two models to realize a train positioning calculating function. The train positioning method, provided by the invention, can not only effectively improve the precision and the stability of the train positioning when the GPS is complete, but also provide a train positioning result with comparatively high precision when the GPS is not complete.

The invention discloses a UWB-based indoor mobile robot positioning and navigation system, including a device layer, an intermediate layer and an application layer; the device layer completes the construction of a system hardware platform, including a base station, a label, a mobile robot and a Wifi communication module, Among them, the base station and the tag realize the positioning function, and the Wifi module and the communication base station in the base station are used to connect the device layer and the middle layer to realize the upload and release of information; the middle layer includes a database, data analysis software and a server to complete data storage and forwarding, analysis and processing and remote access control functions; the application layer mainly provides a friendly remote client software interface to realize online update of mobile robot status information, completion of mobile robot path planning and generation of other related reports. The invention uses UWB technology to realize the positioning and navigation of the indoor mobile robot, and has the advantages of strong anti-interference ability and low power consumption. For other positioning technologies, using UWB signals for indoor positioning can obtain higher positioning accuracy and stability.

The invention discloses a UWB-based external person positioning system and a method for an IDC computer room. The system comprises an access terminal, a positioning label, a plurality of one-dimensional positioning cells, a positioning and resolving module and an information management module. The access terminal is used for carrying out identity verification on an external person in the IDC computer room and inputting the information of the external person. The positioning label is worn on the external person, and is used for generating a TDOA message and a TOF ranging message, broadcasting the TDOA message and sending out the TOF ranging message. Each one-dimensional positioning cell comprises two UWB positioning base stations arranged at the two ends of the cabinet aisle of the IDC computer room, wherein the two UWB positioning base stations receive the TDOA message sent by the positioning label, and sending the time stamp of the received message to the positioning and resolving module. One UWB positioning base station is used as a specific base station to receive the TOF ranging message and send the result to the positioning and resolving module. The positioning and resolving module is used for resolving the data sent by the two UWB positioning base stations to obtain positioning coordinates of the positioning label.

The invention relates to a fitting for a liquid-tight cable leadthrough in an opening (1) in a solid surface (2), which solid surface can be gripped from the back, wherein said fitting comprises an upper boundary plate (4) that covers the opening (1), an elastic moulded element (3) that flatly contacts and is connected to the upper boundary plate (4) and can be at least partially inserted into the opening (1), a lower boundary plate (8) that can be lead through the opening (1), wherein the lower boundary plate flatly contacts and is connected to the elastic moulded element (3) on the opposite side of the elastic moulded element (3) referred to the upper boundary plate (4), a locking plate (9) that can be moved relative to the lower boundary plate (8) and is providable with at least two pivoted locking elements (17), wherein said locking elements are supported between pairs of mounting limbs (20) by element of a bolt (22) and can be pivoted between a position in which the locking plate (9) can be lead through the opening (1) and a stopping position which they enables a gripping from the back of the solid surface (2), at least one clamping element for adjusting the spacing between the upper boundary plate (4) and the locking plate (9) against forces generated during a deformation of the elastic moulded element, and opening (10) that extends through the locking plate (9), the boundary plates (4, 8) and the elastic moulded element (3) and serves for accommodating a cable (7) to be lead through the solid surface (2).

The invention provides a method for improving fixed correct rate of network RTK double-difference wide lane ambiguity. The method comprises the following steps of 1, data preparation, namely receivingreal-time observing data, satellite ephemeris and coordinate information of a GNSS reference station; 2, performing real-time ionosphere product calculation, namely performing non-difference precisesingle-point positioning according to coordinate information and satellite coordinate of the reference station, and calculating a non-difference real-time ionosphere delay value of a satellite signalpropagation path; and 3, performing baseline double-difference wide lane ambiguity calculation, wherein the step 3 comprises a procedure 3.1, forming a double-difference observing value by the observing data of two reference stations, and correcting a double-difference ionosphere residual item by means of the non-difference real-time ionosphere delay value calculated by the step 2; procedure 3.2,calculating a floating point solution of the double-difference wide lane ambiguity; and procedure 3.3, performing rounding on the floating point solution of the double-difference wide lane ambiguity for obtaining a double-difference wide lane ambiguity. The method improves correct rate in understanding the baseline double-difference wide lane ambiguity, thereby improving precision and stability ofthe network RTK.

The invention provides an active vibration damping system based on absolute displacement feedback and used for realizing active vibration damping on a load. The active vibration damping system comprises at least three vibration damping units used for realizing six degree-of-freedom active vibration damping on the load, wherein each vibration damping unit is provided with an absolute displacement measuring device, and the absolute displacement measuring device is used for detecting the absolute displacement of the load in real time; and a vibration damping control unit is respectively connected with the at least three vibration damping units, and the vibration damping control unit realizes active feedback control according to the absolute displacement. The vibration damping system based on the absolute displacement feedback has the following advantages: an air spring and a linear actuator work together to carry out active vibration damping, and the absolute displacement feedback technique is adopted to effectively improve the vibration damping performance of the vibration damping system, effectively increase position loop bandwidth of the vibration damping system and enhance the positional stability of the vibration damping system; and the active vibration damping system is convenient to use, small in size and lower in cost.

The invention discloses an indoor wireless locating method based on the wireless local area network WLAN OFDM signal cyclic prefix. The method includes the steps that a node to be located samples a receiving signal to obtain a sampling signal; a correlation window is built, the maximum value of a log-likelihood function is obtained by sliding the correlation window, and the initial position of an OFDM symbol is obtained; a cross-correlation value of the OFDM symbol is computed according to the initial position of the OFDM symbol; the distance between the node to be located and an anchor node is computed according to a log-distance path loss model; coordinates of the node to be located is estimated according to a self-adaptive distance correcting algorithm. By means of the method, the location error of a system under the extremely low signal-to-noise ratio and the complex multipath channel environment is lowered, and the locating accuracy and stability of the system are improved.

A light emitting diode includes a casing, a frame in the casing, one or a plurality of light emitting chip, and a packaging polymer; the frame being provided with a placement area to receive placement of the light emitting chip, and an electrode area separated from the placement area; a sectional fall being disposed at where appropriately on the placement area to increase contact area between the frame and the casing and improve the relative stability between the casing and the frame.

Apparatus useful in sensing intraocular pressure are provided. The apparatus generally include a rigid tube defining a hollow through space sized and adapted to allow a flexible catheter of a pressure sensor or transducer used to sense IOP to pass in or in fluid communication with the hollow through space. The apparatus includes stabilizing structure for facilitating fixing of the tube in a desired position or angular orientation within the eye. The present apparatus more effectively maintains the position or angle of the flexible catheter or distal end portion of the pressure sensor or in the eye relative to a similar pressure sensor transducer including a flexible catheter without the rigid tube and/or without the stabilizing structure.

The invention discloses an object storage device and a refrigerator with the object storage device. The object storage device comprises a main body, a regulating assembly, a first partition rack and asecond partition rack, wherein the first partition rack is connected to the main body; the second partition rack is rotationally connected to the first partition rack around a vertical shaft throughthe regulating assembly; the regulating assembly comprises a first component, a second component and a locating mechanism; the first component is oppositely and fixedly connected with the first partition rack in the circumferential direction of the vertical shaft; the second component is oppositely and fixedly connected with the second partition rack in the circumferential direction of the vertical shaft, and the second component is rotationally connected to the first component around the vertical shaft; the locating mechanism comprises an adapting surface formed on the second component and anelastic telescopic component telescopically arranged on the first component in the horizontal direction, and the adapting surface is provided with at least two locating grooves which are distributedaround the vertical shaft at an interval; and when the first component and the second component oppositely rotate around the vertical shaft, the elastic telescopic component can be pressed against bythe adapting surface, deforms and is clamped in the locating grooves under the action of the elastic restoring force of the elastic telescopic component.

The invention belongs to the technical field of wireless communication and indoor positioning. The invention discloses an RSS and CSI combined fingerprint indoor positioning method based on deep learning. The method comprises the following steps: collecting and processing RSS and CSI information in an offline stage, training a CSI processing model based on a deep auto-encoder, encoding CSI at a reference point, constructing a fingerprint library by combining RSS and CSI encoding, and dividing sub-fingerprint libraries according to an AP selection algorithm; training a positioning prediction model based on a deep neural network for each sub-fingerprint library; in the online positioning stage, according to the CSI processing model trained in the offline stage and based on the deep auto-encoder, carrying out CSI coding on the to-be-measured point, calculating joint RSS and CSI fingerprints, and carrying out prediction positioning based on a deep neural network model. According to the method, RSS and CSI information are combined, fingerprint information is enriched, and the calculation complexity and time consumption of a positioning prediction model are reduced; and the positioning precision is high, the expandability is strong, and the mobility is high.

The invention discloses a multi-information fusion indoor and outdoor seamless positioning method. The method comprises the following steps: S1, arranging Bluetooth beacons at places where pedestrianspass through; acquiring the satellite navigation data, the ibeacon information and the real-time relative position information of the pedestrian in real time to form multi-source information fusion data; S2, indoor and outdoor judgment is carried out; whether the satellite navigation positioning data receiving quality and the real-time relative position information are in an indoor map range or not is comprehensively judged in combination with the Bluetooth beacon signal intensity receiving condition; and S3, combining the judgment in the step S2 to estimate the position of the pedestrian. The method has the advantages of low cost, high precision, long-time reliable positioning and the like in a complex indoor and outdoor environment.

Systems and methods relating to post or pole installation wherein a post-attachable member with outward projections is fastened to a post or pole prior to installation.

The invention relates to a control valve (18) of a device (1) for varying the control time of an internal combustion engine. In this case, a targeted rotation of the camshaft relative to the crankshaft can be achieved by means of a hydraulic actuator. A control valve (18) with a working connection (A, B), a pressure oil connection (P) and at least one tank connection (T, T1, T2) controls the pressure oil supply or pressure oil discharge of the hydraulic actuator. The invention proposes to arrange a filter (46) between the pressure oil connection (P) and the working connections (A, B).

The invention discloses an interactive calibration method for external parameters of a vehicle video camera in order to implement high-precision video camera external parameter calibration through rational construction of calibration scene and simple man-machine interaction under a condition of obtaining internal parameters of the video camera in advance. A technical scheme is as follows: firstly, obtaining the internal parameters of the video camera; and then constructing a calibration scene having three calibration straight lines on the flat ground; building an auxiliary coordinate system, positioning figures and positions of the three calibration lines in a video camera image through the man-machine interaction, and calculating coordinates and corresponding relationship of the calibration lines in a world coordinate system and the auxiliary coordinate system; finally, calculating the video camera external parameters according to the coordinates of the calibration lines and the corresponding relationship thereof. With the interactive calibration method for the external parameters of the vehicle video camera, all the external parameters of the video camera can be simultaneously obtained, and a parameter solving process is perfect; influence on external parameter calibration caused by aberration of a lens of the video camera can be avoided, and reliability of the calibration process is ensured; and the calibration scene is simply structured, and the calibration method is convenient for implementation and strong in operability.

In an LPP type EUV light source apparatus, the intensity of radiated EUV light is stabilized by improving the positional stability of droplets. The extreme ultra violet light source apparatus includes: a chamber in which extreme ultra violet light is generated; a target supply division including a target tank for storing a target material therein and an injection nozzle for injecting the target material in a jet form, for supplying the target material into the chamber; a charging electrode applied with a direct-current voltage between the target tank and itself, for charging droplets when the target material in the jet form injected from the injection nozzle is broken up into the droplets; a laser for applying a laser beam to the droplets of the target material to generate plasma; and a collector mirror for collecting extreme ultra violet light radiated from the plasma to output the extreme ultra violet light.