69results about How to "Solve the problem of low positioning accuracy" patented technology

The invention discloses a GNSS high precision positioning method for an intelligent terminal. Original pseudorange observation values are smoothed by measuring a Doppler observation value with low noise and no cycle slip, and the measurement noise of the original pseudorange observed quantity of an intelligent terminal GNSS can be significantly reduced; a real-time precise satellite orbit and theclock difference correction information are utilized to precisely modify a satellite orbit and the clock difference calculated through the broadcast ephemeris and clock difference parameters, and calculation accuracy of the satellite orbit and the satellite clock difference can be significantly improved; the ionospheric delay information is accurately calculated through utilizing the real-time precise ionospheric information, and high precision correction of the ionospheric delay error can be realized; the pseudorange and carrier phase measurement uncertainty information is utilized to performpseudorange and carrier phase observed quantity variance, contribution of measurement accuracy of different satellite observed quantities to positioning solution can be more effectively distinguished, and the intelligent terminal can be finally substantially improved, especially for positioning performance of an intelligent handset.

The invention is suitable for the technical field of image processing, and provides a two-dimensional face key feature point positioning method and system. The method comprises the following steps: receiving an input two-dimensional face image, using a preset face key feature point acquisition algorithm to obtain the two-dimensional position coordinates of face key feature points, inputting the two-dimensional position coordinates into a feature point dimensionality conversion model which is established in advance; calculating the three-dimensional position coordinates of the face key feature points corresponding to the two-dimensional position coordinates through the feature point dimensionality conversion model; projecting the two-dimensional position coordinates onto the two-dimensional face image, and obtaining the estimation coordinates of the three-dimensional positions on the two-dimensional face image; through the estimation coordinates and the three-dimensional position coordinates, calculating the positioning precision of the face key feature points; and when the positioning precision is smaller than a preset threshold value, setting the corresponding pixels of the two-dimensional position coordinates in the two-dimensional face image as the face key feature points of the two-dimensional face image so as to improve the positioning precision of the face key feature points.

The invention discloses an oil and gas pipeline leakage positioning method based on a sound wave amplitude attenuation model. The oil and gas pipeline leakage positioning method comprises the following steps of establishing a leakage positioning computing formula in a to-be-tested pipeline; computing the sound absorbing coefficient; detecting the minimum detectable leakage amount or leakage hole diameter of the to-be-tested pipeline, performing the simulating leakage testing experiment at the upstream of a sensor at the head end of the to-be-tested pipeline, computing the correction coefficient according to the obtained amplitude, and further obtaining a leakage judging threshold value and the reference pressure during leakage judging; processing the signals collected by the sensors at the two ends of the to-be-tested pipeline, dividing by the reference pressure, and comparing the result and the leakage judging threshold value obtained by the simulating leakage testing experiment; when the leakage occurs, positioning the leakage of the pipeline according to the positioning formula. The oil and gas pipeline leakage positioning method has the advantages that by computing the sound absorbing coefficient and the correction coefficient in the leakage positioning computing formula, the leakage is detected and positioned; the mounting of a GPS (global positioning system) clock is avoided, the cost is low, the sensitivity is high, and the suitability for the oil and gas pipeline is high.

The invention presents a speech processing method and device. The method includes the following steps: collecting N current speech frames; carrying out sub-band decomposition on each current speech frame to acquire M sub-band signals of each current speech frame, wherein N and M are positive integers; extracting sub-band signals of the same band from the M sub-band signals of each current speech frame; for each band, carrying out beam-forming on the N sub-band signals under the band to get a first speech signal; and carrying out sub-band synthesis on the first speech signals under the bands toacquire an output signal of the current speech frames. According to the method, sub-band decomposition is carried out on each speech frame collected, beam-forming is carried out on the sub-band signals under the same band, and an output signal is obtained through sub-band synthesis. The aliasing in the output signal can be eliminated. Moreover, the signal-to-noise ratio of the output signal is improved, a speech signal with high quality can be output, and the accuracy of speech localization can be improved.

The invention discloses an indoor positioning method based on a logarithmic normal model, and the method comprises the steps: selecting APs with different specifications in a positioning region at aninitial stage of positioning, carrying out the equal-interval division of the positioning region, building a coordinate system, and collecting fingerprint information; filtering the RSSI value, fitting a logarithm normal model according to the filtered RSSI value to model the WiFi signal, screening out an AP (Access Point) most matched with the model, and constructing an RSSI fingerprint library and a high-density virtual fingerprint library; in the real-time positioning stage, on the basis that a node to be positioned is matched with an RSSI fingerprint database, using the integrating degreeof APs to correct the Euclidean distance similarity, finding out fingerprint points with higher similarity, determining the area of the node to be positioned preliminarily, and then carrying out secondary matching with a high-density virtual fingerprint database for accurate positioning. According to the method, the stable APs can be screened out, the problem of low positioning precision caused by difference between AP devices is well solved, the workload of fingerprint acquisition in an offline stage can be reduced through secondary interpolation matching, and the positioning precision is improved.

The invention provides a vehicle positioning system and positioning method based on a two-dimensional code, and the system comprises an image collection device, a positioning controller, and a positioning two-dimensional code disposed on a track. The image acquisition device is connected with the positioning controller. The image acquisition device is used for carrying out image acquisition on thepositioning two-dimensional code to obtain a two-dimensional code image and sending the two-dimensional code image to the positioning controller; and the positioning controller is used for receivingthe two-dimensional code image and analyzing the two-dimensional code image to obtain the position of the positioning two-dimensional code, and taking the position of the positioning two-dimensional code as the current position of the vehicle. By means of the system, vehicle positioning can be achieved according to the positioning two-dimensional code on the track, omnibearing reading is achieved.The vehicle positioning accuracy and the environment adaptability and fault-tolerant capability of the positioning system are improved, and the technical problems that in the prior art. The environment adaptability is poor, and the positioning accuracy is low are solved.

The invention provides a terminal locating method and device, wherein the terminal locating method comprises the following steps of: sending indication information to a terminal in a predetermined cell provided with one or more radio-frequency units, wherein the indication information is used for indicating the terminal to transmit a sounding reference signal in one or more time intervals in an LTE time slot; each time interval corresponds to one radio-frequency unit; and only the radio-frequency units corresponding to the time intervals in the one or more radio-frequency units are set to receive the sounding reference signal transmitted by the terminal in one time interval; obtaining the target time interval in the one or more time intervals when the sounding reference signal transmitted by the terminal is received; and searching the target radio-frequency unit corresponding to the target time interval in the one or more radio-frequency units, and judging that the current position of the terminal is in the signal coverage range of the target radio-frequency unit. By means of the invention, the problem that the locating precision is low due to the fact that the terminal is located in a QCELL cell merging state in the related technology can be solved.

The invention discloses a method for estimating a pedestrian height position in a multi-story building based on an MEMS sensor. The method comprises the steps of: fixing an MEMS integrated sensing device on a pedestrian's lower limb; employing the MEMS integrated sensing device to collect acceleration data, angular velocity data and pedestrian height data in the process that the pedestrian walks astaircase; employing a multi-threshold detection method to determine an attitude phase and the swing phase of the pedestrian gait movement; performing correction of the accelerations of the attitudephase and the swing phase in the vertical direction, updating the speed of the attitude phase to be 0, and performing secondary integration for the corrected acceleration in the vertical direction toobtain the estimated heights of the attitude phase and the swing phase of the pedestrian; and determining whether there is deviation between the estimated height data obtained by the attitude phase and the target height data measured by a micro manometer or not, if yes, performing error linear compensation for the estimated height obtained by the swing phase and finally obtaining the updated pedestrian positioning data. The accurate estimation of the pedestrian height position is achieved based on one sensor node.

The invention provides a double-end traveling wave distance measuring method based on fault waveform initial point step-out time. The double-end traveling wave distance measuring method based on faultwaveform initial point step-out time comprises the following steps: carrying out zero-phase-shift digital filtering on traveling waveform data; establishing a linear equation by selecting a referencepoint when a waveform initial point has not arrived yet and a waveform maximum value; calculating to obtain a point of various waveform points, which is distant from the straight line by the longestdistance, between two points as a traveling waveform initial point; and calculating the position of a fault point according to a double-end traveling wave fault distance measuring principle. Comparedwith a traditional double-end traveling wave fault distance measuring method which acquires traveling wave arriving time by using a wave capturing head or acquiring signal fantastic points by using wavelets to obtain traveling wave arriving time and the like, the method for calculating the traveling wave step-out time is not affected by a traveling wave dispersion dispersion effect, and the circumstance that positioning precision is reduced due to traveling wave attenuation and distortion problems caused by wave impedance is avoided; and meanwhile, the problem that the positioning precision ofa fault point is not high due to distortion of a traveling wave head caused by the reason that the frequency response bandwidth of a traveling wave sensor is narrow can be solved.

The invention discloses a large-span box-type steel beam sliding installation construction process and device, and relates to the technical field of structural engineering. Thick rail pressing platesare arranged on the upper portions of the two sides of the lower end of a sliding rail, a jig frame and a wedge-shaped clamping block are arranged at the upper end of the sliding rail in a sliding mode, square steel is fixedly arranged on the two sides of the upper end of the jig frame, a to-be-installed steel beam is clamped at the upper end of the jig frame through the square steel, and a pushing lug plate is arranged on the outer surface of the to-be-installed steel beam; the fixed end of a hydraulic oil cylinder is rotationally connected with the pushing lug plate, a hydraulic crawl deviceis in rigid connection with a to-be-slid component, and the connection mode is good in synchronism control over all sliding (pushing) points when the sliding span and the spacing distance are large and the number of trusses is large, so that the problem that the in-place accuracy of the steel beam is not high is solved; and the assembly and accumulated slippage of each unit structure can be constructed at the same time and do not influence each other, and the absolute time of hydraulic slippage operation is short so that the installation period of a roof box girder can be effectively ensured.

The invention discloses a calculating method of the equivalent pipe length of a telescoping pipeline. The method includes steps: establishing a sound wave amplitude attenuation model and a straight tube segment leakage sound wave amplitude attenuation model; obtaining gas operation parameters in a straight tube segment, and calculating a straight tube segment sound wave amplitude attenuation factor according to the gas operation parameters in the straight tube segment; obtaining an installation distance of two sensors, acquiring leakage sound wave signals of leakage sound waves spreading through a telescoping pipeline segment, and extracting a leakage sound wave signal amplitude; introducing the leakage sound wave signal amplitude and the straight tube segment sound wave amplitude attenuation factor into the sound wave amplitude attenuation model, and obtaining a sound wave spreading distance; and calculating the equivalent pipe length of the telescoping pipeline according to the sound wave spreading distance in step 4 and the installation distance of the two sensors in step 3. The beneficial effects of the calculating method of the equivalent pipe length of the telescoping pipeline are that the equivalent safety distance of the sensors can be obtained through the establishment of the calculating formula of the equivalent pipe length of the telescoping pipeline, and the positioning precision is improved.

The invention provides a power transmission line single-phase grounding fault positioning method and a system thereof, wherein the method comprises the steps of acquiring a voltage signal of three-phase power on the power transmission line by a detecting terminal, performing phase-mode transformation on the voltage signal, and obtaining zero-mode voltage; on the condition that the zero-mode voltage is not equal with a first preset threshold, transmitting the zero-mode voltage to an upper computer; if the zero-mode voltage is higher than a second preset threshold and gradient of a traveling wave front which corresponds with the zero-mode voltage is higher than a third preset threshold, calculating a distance between a fault point and the detecting terminal by the upper computer by means ofa travelling wave attenuation method; and determining the position of the single-phase grounding fault according to the distance between the fault point and the detecting terminal. According to the method of the invention, the position of the single-phase ground fault is fixed by means of a zero-mode voltage traveling wave attenuation characteristic; easy identification and relatively high precision of the zero-mode voltage travelling wave front are realized; the fault position can be quickly found for eliminating a hidden trouble; and a problem of low positioning precision caused by relatively weak to-be-detected amount in a traditional positioning method is settled.

The invention discloses a region identification method and device, and belongs to the field of image processing. The region identification method comprises that binaryzation is carried out on a text region to obtain a binary text region which comprises multiple characters in the same row; a histogram of the binary text region is calculated according to the vertical direction, and the histogram comprises accumulated values of horizontal coordinates and foreground color pixel points of pixel points in each column; and according to distribution information of the accumulated values in the histogram, a character region of characters in the text region is identified. Thus, the problem that positioning of a text region is low in accuracy in the prior art is solved, and the character region can be accurately positioned according to distribution information of the accumulated values of the foreground color pixel points in the histogram.

The invention, which is applicable to the technical field of tracking, provides a tracking control method and device and a mobile terminal. The method includes: carrying out communication connection with at least three unmanned aerial vehicles arranged at different straight lines; acquiring a first distance between each unmanned aerial vehicle and a tracked target; acquiring location information of each unmanned aerial vehicle, acquiring a vertical projection point of each unmanned aerial vehicle on the plane on which the tracked target is located based on the location information, and calculating a second distance from the unmanned aerial vehicle to the vertical projection point; according to the first distance and the second distance, calculating third distances between the vertical projection points and the tracked target based on the Pythagorean theorem; according to the at least three third distances, acquiring the position information of the tracked target according to a three-point positioning algorithm; and controlling the unmanned aerial vehicles to track the tracked target based on the position information of the tracked target. Therefore, the moving tracked target can belocated accurately. The implementation process is simple; the algorithm is simple; and the practicability and usability are high.

The invention discloses a self-tightening-and-loosening sleeper fastener bolt operation vehicle and an operation method thereof. The operation vehicle comprises a vehicle frame supported on a steel rail by a wheel set, an auxiliary frame transversely arranged on the frame, and an operation mechanism which is arranged on at least one of the left side and the right side of the auxiliary frame and located on the transverse outer side of the frame. The operation mechanism is provided with a sensor assembly used for bolt detection, an image acquisition assembly used for bolt positioning, and a tightening and loosening shaft device used for tightening or loosening a bolt. The operation mechanism can drive the loosening and tightening shaft device to move in the transverse direction, the longitudinal direction and the vertical direction relative to the auxiliary frame so as to position and align the bolts. The operation vehicle can solve technical problems that in an existing sleeper bolt dismounting mode, positioning precision between the operation mechanism and the bolts is not high, a transverse distance between bolt wrenches is fixed, and a large change of a bolt distance cannot be adapted.

The invention discloses an in-place direction algorithm, a terminal and a storage medium. The method comprises the following steps that a dental crown grid surface and a false tooth grid model centralpoint are obtained in a false tooth grid model; the dental crown grid surface is divided into a plurality of first regions; any point in the first area is selected as a first vertex of the first area, and the direction from the first vertex to the center point of the false tooth grid model is used as a first candidate in-place direction; first undercut areas of the dental crown grid surface are obtained in the first candidate in-place direction according to the first vertex, the center point of the false tooth grid model and the dental crown grid surface; and the first candidate in-place direction corresponding to the smallest first undercut area in the first undercut areas of the dental crown grid surface is used as the final in-place direction of the false tooth grid model. According tothe in-place direction algorithm, the terminal and the storage medium, the problem of low accuracy of the false tooth in-place direction generated in existing false tooth design software is solved.

The invention discloses a non-standard part machining clamp for a precision machine tool. The clamp is characterized in that when a non-standard part to be machined is positioned and clamped, a visualdetection mechanism can scan and detect one or more surfaces or points on the top of the non-standard part, and the visual detection mechanism is used for calculating the spatial position coordinatesof one or more surfaces or points; in this way, by means of a controller, the controller can control a compensation supporting and adjusting mechanism to carry out telescopic adjustment in the heightdirection according to the spatial position coordinates calculated by the visual detection mechanism, so that accurate positioning of the non-standard part to be machined is achieved, the positioningprecision of the non-standard part is guaranteed, the clamping and positioning reliability is improved, the tool setting precision during subsequent machining is improved, and high-precision positioning and clamping and high-precision machining are achieved; and the non-standard part machining clamp for the precision machine tool effectively solves the problem that the positioning precision of floating supporting is not high, and effectively improves the machining precision.

The invention relates to an infrared light curtain vehicle sensor and method. The infrared light curtain vehicle sensor comprises a main sensor, an auxiliary sensor and a system micro-controller, wherein the main sensor comprises a horizontal infrared light curtain sensor capable of sensing vehicle driving-in information and vehicle axle distance length information; and the auxiliary sensor comprises two infrared light curtain sensors which are perpendicular to each other and can measure the widths of vehicles which are driven in. The infrared light curtain vehicle sensor can be used for parking navigation of vehicles in a parking lot conveniently, and the problem that a vehicle navigator or a mobile phone map close to a parking lot is poor in navigation precision, and even cannot be usedis solved; if the infrared light curtain vehicle sensor is combined to a visible light LED array, one-to-one accurate positioning parking navigation consistent to the driving slight of a driver is obtained; by visible light LEDs, error-less walking navigation for a driver and passengers who enter or leave away from the parking lot can be provided; and by voice and light signals, whether the vehicles park and are positioned accurately or not can be prompted, and scratching is prevented.

The invention discloses an intelligent firefighting control system based on Internet technology, and belongs to the intelligent building field. The intelligent firefighting control system comprises a server, an upper manager, a coordinator, gateway controllers, alarming equipment, linkage control equipment, reference nodes, and positioning nodes. The upper manager is connected with the server, the coordinator, and the gateway controllers by CAN buses. The coordinator is connected with the alarming equipment and the linkage control equipment by a ZigBee wireless sensing network. The gateway controller is disposed on ever floor, and the gateway controllers are connected together by the CAN buses, and are connected with the ZigBee wireless sensing network by the reference nodes and the positioning nodes, and the reference nodes and the positioning nodes are connected together by the ZigBee wireless sensing network. A positioning system is combined with alarming and firefighting linkage control, and after the alarming, the linkage control equipment is started, and then by using the wireless positioning system, a fire hazard area is determined accurately, and therefore after firefighters receive alarming information, the firefighters can search and rescue trapped people timely and accurately.

The invention discloses a face five-sense-organ positioning method and a device. The method comprises the following steps: acquiring a thermal infrared image of the human face; converting the thermalinfrared image from an RGB color space to an HSV color space; carrying out mask processing on the thermal infrared image of the HSV color space to obtain a facial contour of the infrared image; and the five sense organs of the face contour of the infrared image are positioned by using a pre-constructed BP neural network, so that the problem of low positioning accuracy of the five sense organs of the face in the prior art is solved.

The invention relates to the technical field of image recognition, and provides a water gauge character positioning method and device, a computing device and a storage medium. The water gauge character positioning method comprises the steps of obtaining a plurality of to-be-recognized water gauge character images with time attributes and spatial position attributes for the same ship; generating animage set from the plurality of to-be-identified water gauge character images according to the time attribute and the spatial position attribute; inputting the image set into a pre-trained convolutional neural network, wherein the convolutional neural network combines time attributes and spatial position attributes of the water gauge character images in the image set to obtain water gauge character positions in the to-be-identified water gauge character images; and performing identification processing on the water gauge characters in the to-be-identified water gauge character image. Through the implementation of the invention, the problem of low water gauge character positioning accuracy of a water gauge character positioning method in the prior art can be solved.