308results about "Devices using time traversed" patented technology

The present application provides an image-based speed determination method, apparatus, device, and storage medium, which relate to the technical field of image recognition. The method includes: obtaining a first image and a second image during the movement of a target object in an environmental space, where the acquisition time of the first image is later than that of the second image; fusing a first feature extracted from the first image and a second feature extracted from the second image to obtain a fused feature map, where the fused feature map includes first pixel position information and second pixel position information of the target object; performing a first convolution operation on the fused feature map to obtain a displacement information feature map, where the displacement information feature map is used to represent the correspondence between pixel positions and displacements; extracting a target displacement corresponding to a target pixel position from the displacement information feature map; and determining the movement speed of the target object at the acquisition time of the first image according to the target displacement.

The invention relates to the technical field of vehicles, in particular to a vehicle speed detection method and device, electronic equipment, a target vehicle and a medium. Attribute information of a single-chip microcomputer for collecting the vehicle speed pulse signal in the target vehicle is obtained; determining a clock configuration mode of a capture channel of the single-chip microcomputer according to the attribute information of the single-chip microcomputer; according to the clock configuration mode, the vehicle speed pulse signal is collected in a preset collection mode, and the target pulse width of the vehicle speed pulse signal is determined; and determining the vehicle speed of the target vehicle based on the target pulse width of the vehicle speed pulse signal. The accuracy of the determined target pulse width of the vehicle speed pulse signal is ensured. The vehicle speed of the target vehicle is determined based on the target pulse width of the vehicle speed pulse signal, and the accuracy of the determined target vehicle speed is ensured. According to the method, the clock configuration mode of the capture channel of the single-chip microcomputer is considered, so that the situation that the performance of the single-chip microcomputer cannot meet the vehicle speed collection requirement, the collected vehicle speed cannot cover the whole vehicle speed range, and the collection precision is not high is avoided.

The invention discloses a glacier movement speed calculation method, system and device based on three-dimensional laser scanning point cloud data, a medium and a product, and relates to the field of geographical environment survey, and the method comprises the steps: carrying out the three-dimensional laser scanning of the surface of a glacier, and obtaining the point cloud data at different moments; adopting a Cosi-Corr algorithm to calculate a displacement field between the point cloud data at different moments; and calculating the glacier movement speed based on the displacement field. According to the invention, the point cloud data is obtained based on three-dimensional laser scanning, automatic data registration and analysis are carried out through the Cosi-Corr algorithm, and the glacier movement speed can be accurately calculated.

A computer-implemented method for estimating a travelling speed of a wireless device in a wireless communications network, where the wireless device has transmitted a signal sequence to a network node via two or more signal paths. The method includes obtaining data indicative of a Doppler speed difference between respective multipath components of the signal sequence transmitted via the two or more signal paths; obtaining data indicative of direction of departure, DoD, (nUE,P1, nUE,P2) of the two or more signal paths at the wireless device; and estimating the travelling speed of the wireless device based on the data indicative of the Doppler speed difference and the data indicative of DoD.

The invention provides a train instantaneous speed estimation method and system, and belongs to the technical field of rail transit operation monitoring, and the method comprises the steps: collecting a vertical or transverse dynamic displacement signal of a steel rail, and dividing the time domain dynamic displacement data of a certain measurement channel into a plurality of sliding window subsequences according to a fixed length; smoothing each sliding window sub-sequence in sequence to obtain a de-noising smooth waveform of the complete signal; performing wave crest detection on the obtained smooth waveform, and determining the position of a signal wave crest; serialization processing is carried out according to the time sequence, and every two adjacent wave crests are paired so as to judge the bogie and the carriage; and reversely calculating the instantaneous speed of the train according to the identified wave crest time interval and the time difference when each bogie passes by in combination with the train marshalling number, the train fixed distance and the wheelbase information. The method can effectively estimate the instantaneous running speed of each compartment of the train, and has good self-adaptability to signals under the influence of various random parameters.

A computer-implemented method comprising the following steps: obtaining (600) an image timestamp indicating the time of acquisition, by a traffic control radar, of an image showing a vehicle's license plate, the image timestamp having been provided by a clock on the traffic control radar; obtaining (602) time synchronization data, said time synchronization data having been received by the traffic control radar during a predefined time interval including the image timestamp to temporally synchronize the clock of the traffic control radar with a time server; and consistency testing (604) of the image timestamp with the time synchronization data, the consistency test producing a test result indicating whether the image timestamp is valid or invalid. Figure for the abstract: Fig. 4

Provided is a monitoring system that includes: a detection position acquisition means that acquires a first detection position at which vibration was detected at a first optical fiber cable and a second detection position at which vibration was detected at a second optical fiber cable that is spaced at an interval from the first optical fiber cable; and a crossing angle estimation means that estimates the crossing angle at which a mobile body has crossed the first optical fiber cable and the second optical fiber cable on the basis of the first detection position and the second detection position.

The application provides a conveyor speed detection method, device and equipment based on a dual-antenna RFID. The method comprises: tracking and processing an RFID tag by using a first antenna, and recording a first phase sequence of the RFID tag; tracking and processing the RFID tag by using a second antenna, and recording a second phase sequence of the RFID tag; determining a phase difference between the first phase sequence and the second phase sequence, and determining a phase difference speed according to the phase difference; determining a Doppler speed according to movement data of the RFID tag; fusing the phase difference speed and the Doppler speed by using a Kalman algorithm, determining a final conveyor belt speed, and outputting the final conveyor belt speed. The phase difference speed is determined according to the phase difference between the phase sequences of the two antennas. The Doppler speed is also determined. The phase difference speed and the Doppler speed are fused by using the Kalman algorithm, and the final conveyor belt speed is determined, so that the conveyor belt speed is accurately detected with high precision.

The invention relates to a computer-implemented method for determining the state of a working device in a pipeline designed for transporting fluids, comprising the steps of: - Providing initial magnetic field data of a particularly remanent magnetic field of the pipeline, recorded with at least one first magnetic field sensor of the working device, wherein the initial magnetic field data form a first signal profile of the magnetic field measured by the first magnetic field sensor along a section of the pipeline, - Providing second magnetic field data of the magnetic field recorded by at least one second magnetic field sensor of the working device arranged axially offset to the first magnetic field sensor, wherein the second magnetic field data form a second signal waveform of the magnetic field recorded by the second magnetic field sensor, - Matching the first and second magnetic field data to determine a time offset of the signal waveforms, - Determining the speed of the working device from the time difference and the distance between the two magnetic field sensors.

The invention discloses a crawler excavator driving speed and driving linearity detection system and method, and the system comprises a target plate group, a laser displacement sensor, a microcontroller MCU and a Phyphox mobile phone terminal special test software, the target plate group comprises target plates A, B and C which are sequentially arranged along a preset driving route, the center lines of the three target plates are collinear and are parallel to the initial advancing direction of the excavator; the detection axis of the laser displacement sensor is orthogonal to the advancing direction of the excavator, and the horizontal distance between the excavator and the target plate is collected in real time; the MCU is used for acquisition, preprocessing, operation and data communication of signals of the laser displacement sensor; the Phyphox mobile phone end special test software establishes communication with the microcontroller MCU through Bluetooth to process detection data, synchronous detection of the driving speed and linearity is achieved, and the test efficiency is improved; whether the excavator is in a constant-speed driving state on a test road section or not is accurately judged, and the requirement that the driving speed of the excavator in a test area is constant is met.

The invention discloses a sorting mistake-proofing method and device for a multi-layer printed circuit board (PCB) lamination, a medium and a product, and relates to the technical field of automatic production. The method comprises the following steps: acquiring a surface image of a circuit board to be stacked; the identification code is analyzed from the surface image, and the current moment is recorded; calling a matched preset stacking formula, and obtaining a dynamic time threshold value associated with the product model information; comparing the layer information with target layer information in a preset stacking formula to obtain a layer matching judgment result; acquiring a thickness value of a medium in the preset scanning area; calculating a time interval, comparing the time interval and the thickness value with a dynamic time threshold value and a preset thickness threshold value respectively, and generating a partition paper placement judgment result; according to the layer matching judgment result and the partition paper placement judgment result, a control instruction is generated; and carrying out stacking operation or stopping operation according to the control instruction. By implementing the technical scheme provided by the invention, the final qualification rate and reliability of the product can be effectively improved.

The invention provides a maritime distress target drift prediction method, medium, equipment and program product, and relates to the technical field of marine search and rescue, and the method comprises the steps: obtaining a real-time updated initial position of a maritime distress target and real-time marine dynamic environment field data; calculating a drifting motion speed component caused by the ocean dynamic environment field data, and performing vector synthesis on the speed component to obtain an initial maritime distress target drifting speed; analyzing historical data by using an artificial intelligence model to generate a compensation drift speed, and synthesizing the initial maritime distress target drift speed and the compensation drift speed into a maritime distress target drift speed; and in combination with the initial position of the maritime distress target and the drifting speed of the maritime distress target, establishing a maritime distress target drifting trajectory prediction model, and predicting the position of the maritime distress target in real time. The method can improve the prediction precision and timeliness of the drift trajectory of the maritime distress target.

Systems and methods for analyzing laser beam characteristics in high-speed laser motion systems, wherein the characteristics include laser travel speed, velocity, and acceleration, wherein the high-speed laser motion systems comprise a laser for generating a laser beam, comprising determining a location of the first pin-hole sensor within the predetermined field of view; determining a location of the second pin-hole sensor within the predetermined field of view; defining a travel distance of the laser beam; measuring the amount of time to travel from the location of the first pin-hole sensor to the location of the second pin-hole sensor; and dividing the travel distance by the amount of time to travel from the location of the first pin-hole sensor to the location of the second pin-hole sensor to calculate the velocity of the laser beam between the first pin-hole sensor and the second pin-hole sensor.

The invention belongs to a method for testing the rotating speed of a flying projectile in the field of non-sitting force guns, which comprises the following steps of: photographing and capturing the flying projectile by using a high-speed camera at a specified station on one side of a ballistic trajectory, recording the starting time and the ending time by using marks on the surface of the projectile, and calculating the average rotating speed of the projectile at a certain point when the projectile flies; the system is composed of an emplacement (1), a flying projectile (3) and a high-speed camera (2). According to the method, after an artillery on a gun position (1) shoots ammunition, a flying projectile (3) appears on a trajectory trajectory, a high-speed camera (2) shoots the movement condition of the projectile in a view field and stores the movement condition, and then the time when a marking line is located on the axis of a projectile shaft after the projectile enters the view field and before the projectile leaves the view field is checked and recorded as T0 and T1 respectively, according to the time interval from T0 to T1 of the projectile, the number of turns of the projectile rotating in the interval can be read, and according to the number of turns of the projectile rotating and the time, the flight rotating speed of the projectile can be obtained through calculation.

The invention discloses a train safety speed measuring device and method and a positioning system, and the device comprises a plurality of speed measuring instrument combination mechanisms, and each speed measuring instrument combination mechanism comprises at least two laser speed measuring instruments; the support comprises at least two supporting rods, one ends of the at least two supporting rods or extension lines of the ends of the at least two supporting rods have an intersection point, the included angle between any two supporting rods is fixed, and the at least two laser velocimeters and the at least two supporting rods are arranged in a one-to-one correspondence mode; the ejector rod is located at the top of the support, and the ejector rod is connected with a train bogie; and a laser beam of each laser velocimeter corresponds to a rail surface of a train rail. The speed of the train is directly measured, the speed measurement error caused by wheel idling and slipping is avoided, the speed measurement precision is improved, the positioning precision of the train is improved, the safety margin is shortened, and the operation efficiency is improved.

The invention relates to a method for determining a speed of a vehicle (10), in particular a rail vehicle (10), during travel on a travel path (14), the vehicle (10) comprising two sensor units (16a; 16b) of the same design and the second sensor unit (16b) being mounted on the vehicle (10) at a distance along a direction of travel of the vehicle (10), and the method comprising the following steps: • reading in first and second sensor data captured by means of the first and second sensor units (16A; 16B) during the travel on the travel path (14), the first and second sensor data representing the same physical property of the travel path (14); • determining a transit time difference on the basis of the read-in first and second sensor data, which transit time difference has a value from a set of specified quantized values due to a quantization effect resulting from a specified capture rate of the sensor units (16a, 16b); • reading in specified speed error information which represents a statistical distribution of a speed error; and • determining a speed of the vehicle (10) on the basis of the determined transit time difference and the read-in speed error information by means of a computing unit (20) in order to provide a speed value or speed curve corrected in view of the quantization effect.

Disclosed are method and electronic components for: i) electronically extracting a sequence of values from a measurement signal corresponding to a position of a moving object, wherein the sequence of values indicates the position of the moving object at corresponding time increments; ii) electronically determining at least one of an estimate for a velocity of the moving object and an estimate for an acceleration of the moving the object based on a plurality of the values in the sequence of values; and iii) electronically correcting a value in the sequence of values to substantially reduce the effect of processing and signal delays based on one or both of the velocity and acceleration estimates.

The invention relates to a small-load pneumatic ejection separation test platform and a speed projection engineering estimation method. The test platform is composed of an air compressor, a high-pressure gas cylinder, an electromagnetic valve, a pressure gauge, a mounting rack, an ejection cylinder, a piston, a high-speed camera, a grid background plate, an irradiation lamp, a protection pad and other components. The air compressor is used for providing high-pressure gas required by the ejection system; the high-pressure gas cylinder is used for storing high-pressure gas required by system ejection; the electromagnetic valve is used for controlling the ejection device to start; the pressure gauge is used for measuring gas pressure in the gas cylinder; the ejection cylinder is used for providing a space required by high-pressure gas expansion and a track required by object ejection; the piston is used for converting aerodynamic force into thrust to provide acceleration for a separated object; the grid background plate is used for determining the position of the isolate shadow; and the irradiation lamp is used for irradiating the separated object and projecting a shadow on the square background plate. The device has the advantages of being safe in experiment, easy to install, convenient to recycle, convenient to maintain and capable of repeating the experiment.

The invention discloses a speed measurement system and method for linear impact, and the system comprises a displacement detection module, a data processing module and a central processing module, and the displacement detection module is used for detecting the real-time displacement of a moving object in the process of moving towards an impact test object. The data processing module is used for determining a preset speed measurement interval according to a preset speed measurement position point and a preset speed measurement length, and generating a pulse signal and outputting the number of pulses according to the real-time displacement when the moving object is within the range of the preset speed measurement interval; the moving time of the moving object in the preset speed measurement interval is calculated, and the average speed of the moving object in the preset speed measurement interval is calculated according to the moving time and the preset speed measurement length and serves as the moving speed of the preset speed measurement position point. According to the invention, the speed of the moving object at different speed measurement points and speed measurement lengths in the moving process is detected, and the flexibility, convenience and accuracy of the impact test are improved.

The invention relates to a proximity switch (1) for detecting a measurement object (M) in a detection range and for determining a speed value of the measurement object (M), comprising: - a resonant circuit (2) with at least one resonant circuit inductance (L) and at least one resonant circuit capacitance (C1, C2), wherein the at least one resonant circuit inductance (L) is designed to interact with a measurement object (M) such that the resonant impedance of the resonant circuit (2) changes depending on the distance of the measurement object (M) from the resonant circuit (2); - an oscillation amplifier (O) which forms an oscillator with the resonant circuit; - an oscillation measurement unit (3) for determining an oscillation measure;- a switching signal unit (4) configured to generate a first switching signal (S1) upon falling below or exceeding a first switching threshold (USP1, SW1) and a second switching signal (S2) upon falling below or exceeding a second switching threshold (USP2, SW2), which is different from the first; - a timer (5) configured to be started by the first switching signal (S1) and to be stopped by the second switching signal (S2), and to provide a time indication for the time interval between the first and the second switching signals (S1, S2); - a speed calculation unit (6) configured to provide a speed indication depending on the time indication.

The application provides a method for measuring Leeb hardness and Shore hardness based on double-coil electromagnetic induction, which comprises the following steps: placing a to-be-measured object and a magnetized impact body on two sides of two closed coils respectively; the magnetized impact body impacts the surface of the to-be-measured object after passing through the two closed coils at a certain speed; the time interval and the speed of the magnetized impact body when passing through the two closed coils are recorded; and the Leeb hardness or the Shore hardness of the to-be-measured object is calculated. The method for measuring Leeb hardness and Shore hardness based on double-coil electromagnetic induction greatly reduces the error of detection data, and the calculated Leeb hardness and Shore hardness have high accuracy.

The invention provides a mining ultrasonic positioning and speed measuring system which comprises a vehicle-mounted ultrasonic device, an ultrasonic base station, a wireless communication base station, a communication network, a management server and a monitoring terminal. The vehicle-mounted ultrasonic equipment is carried by mining mobile equipment and is used for transmitting monitoring and detecting ultrasonic waves, the ultrasonic base station is used for receiving the detecting ultrasonic waves, processing the detecting ultrasonic waves and obtaining the distance between the vehicle-mounted ultrasonic equipment and the ultrasonic base station and the vehicle speed, and the system combines the ultrasonic speed measurement technology, the distance measurement technology and the communication technology to obtain the distance between the vehicle-mounted ultrasonic equipment and the ultrasonic base station. The precision and speed detection problem of an existing underground positioning system is solved, and the method can be widely applied to the field of underground closed space positioning and the like.

The present application relates to the technical field of image recognition. Provided are an image-based speed determination method and apparatus, and a device and a storage medium. The method comprises: acquiring a first image and a second image of a target object during movement in an environment space, wherein the acquisition time of the first image is later than the acquisition time of the second image; fusing a first feature extracted from the first image and a second feature extracted from the second image to obtain a fusion feature map, wherein the fusion feature map comprises first pixel position information and second pixel position information of the target object; performing a first convolution operation on the fusion feature map to obtain a displacement information feature map, wherein the displacement information feature map is used for representing a correspondence between a pixel position and a displacement; extracting, from the displacement information feature map, a target displacement corresponding to a target pixel position; and according to the target displacement, determining the movement speed of the target object at the acquisition time of the first image.

The invention provides a movement speed calculation device and a movement speed calculation method, which can calculate the movement speed of a measured object without using transmitted light to the measured object. This movement speed calculation device is provided with: a light quantity distribution signal acquisition unit that acquires, from a light detector that images, using an imaging lens, reflected light including light unevenness from a side surface of a moving object to be measured, a light quantity distribution signal corresponding to images of the reflected light captured at two different times from each other, from a light detector that images the reflected light including light unevenness from the side surface of the moving object to be measured; a movement amount calculation unit that calculates, from the light quantity distribution signals at two different times acquired by the light quantity distribution signal acquisition unit, the amount of movement pixels that move within a difference between the two times; and a speed calculation unit that calculates the moving speed of the object to be measured on the basis of the lateral magnification of the imaging lens, the pixel pitch of the photodetector, the difference value, and the amount of moving pixels.

To provide a speed calculation device and a speed calculation method for more accurately measuring speed of a movable body in comparison to a case when a composition of this invention is not provided.SOLUTION: A speed calculation device includes: an overhead wiring position calculation unit 111 for acquiring a first position which is a position of an object with a rail 102 as a reference in a position separated from a sensing unit 108 by a first distance from measured result by the sensing unit 108 installed on a vehicle 101 moving on the rail 102 by measuring the distance from the object such as trolley wire 103 or catenary wire 104 and a second position which is the position of the object with the rail 102 as the reference in a position separated from the sensing unit 108 by a second distance; and an estimated speed determination unit 114 for calculating the speed of the vehicle 101 based on difference from the first distance to the second distance and difference in time where the first position and the second position match.SELECTED DRAWING: Figure 1

The invention relates to a calibration device (10) intended to be coupled to a laser velocimeter (VL) comprising: a disk (D), a mirror (M) fixed to the disk, a first illumination / reception device (DIR1) configured to receive a first light signal (S1) at a first frequency, orient and focus the first light signal so as to form a first incident signal illuminating the surface of the mirror at an incidence normal to a position of the disk during a passage of the disk, and according to a determined diameter on said surface, recover a first reflected signal (SR1) by the mirror at a frequency shifted relative to the first frequency of a Doppler shift (Δf), said calibration device being further configured to provide at output, at least a fraction of said first reflected signal and a value of a first standard tangential velocity (vte1) determined from said angular velocity (ω) and said measurement radius (Rm),intended for calibrating the laser velocimeter (LV). Figure 1,

The application belongs to the technical field of intelligent transportation, and discloses a method, system and equipment for detecting road vehicle speed and vehicle distance based on unmanned aerial vehicle vision. The method comprises the following steps: tracking vehicles in a video taken by an unmanned aerial vehicle in real time by improving a YOLOv11 network and a BotSort algorithm, obtaining vehicle trajectories, converting pixel coordinates of vehicles detected in each frame into world coordinates by combining a conversion matrix H of pixel coordinates and world coordinates, and forming a trajectory sequence of vehicles in a world coordinate system; for a vehicle i, obtaining corresponding world coordinates from pixel coordinates at time t and (t+delta t) in consecutive video frames through the conversion matrix H, calculating displacement between two points according to an Euclidean distance formula, and calculating average speed of the vehicle in the time period. The application can realize efficient, stable and reliable vehicle speed measurement and vehicle distance calculation.

The utility model discloses a device for calculating the rotating speed of a wrist ball based on photoelectric induction. The device comprises an inertia metal ball; the shell is arranged outside the inertial metal ball; the rotating shaft is arranged on any axis of the inertial metal ball; the optical signal generator is arranged on the inertial metal ball and is used for emitting an optical signal; the receiver is arranged on the shell, and after the optical signal generator and the receiver intersect, the receiver receives the optical signal and can generate a rising edge; the timer is electrically connected with the receiver and is used for calculating the time interval of receiving the optical signal by the receiver; the controller is electrically connected with the receiver and the timer, and the controller is set to calculate the rotating speed of the inertial metal ball according to the time interval. Through cooperation of the optical signal generator, the receiver, the timer and the controller, the rotating speed of the inertial metal ball is calculated, a user can visually see rotating speed information, and the use experience feeling is improved.

The application relates to an acceleration measuring device based on a particle image velocimetry, which comprises at least two CCD cameras, the center points of the mirrors of the two CCD cameras are located on a straight line through a limiting device; a tracer particle generator is used for emitting tracer particles along the direction vertical to the normal of the mirror of the CCD camera; a four-pulse laser is used for sequentially emitting four pulse laser beams along the direction vertical to the direction of the particle flow to illuminate the tracer particles; a control device is connected with the CCD camera and the four-pulse laser respectively, and is used for synchronously controlling the CCD camera and the four-pulse laser, so that the CCD camera acquires the tracer particle images under the irradiation of different pulse lasers in a double-exposure mode, and the speed and acceleration of the particles are acquired based on the tracer particle images. Since the four-pulse laser capable of sending four high-energy pulse lasers at a time is adopted, at least four particle images with a very short time interval are acquired by using two CCD cameras, and then the particle acceleration can be acquired.

The present application relates to a kind of vehicle speed detection methods based on outer pole face image, belong to the field of automatic driving.The method includes: S1: periodically capture the image of the road in front of vehicle, obtain time-space distance image;S2: the curve cluster surface of the time-space distance image obtained is divided into several parts;S3: the curve corresponding to each part obtained;S4: by its analytic differential, the speed curve of each part is obtained;S5: the generation of full interval speed curve, according to the displacement of feature point, the speed of vehicle is calculated.The present application is based on the principle of visual kinematics, using the image obtained by vehicle-mounted camera and distance sensor, the speed of vehicle is calculated by observing the motion of feature point in image.Compared with the existing speed detection method based on physical sensor, the method is lower in cost, but the principle is simple, and the accuracy is also higher.The method can be used alone, can also be combined with the data of other sensors, improve detection accuracy and stability.