515results about "Devices using time traversed" patented technology

A LiDAR apparatus, including: a laser to generate an optical signal; modulation components configured to receive the optical signal as an input and to output at least two corresponding modulated optical signals at respective output ports, wherein each modulated optical signal is modulated by a corresponding pseudo-random bit sequence, and: (i) the optical signals have respective different delays such that the modulations do not overlap in time; or (ii) the pseudo-random bit sequences have low cross-correlation; for each of the at least two modulated optical signals, a corresponding optical transmitter configured to transmit the corresponding modulated optical signal towards a corresponding surface spaced from the LiDAR apparatus by a corresponding distance, and a corresponding optical receiver configured to receive a portion of the transmitted optical signal scattered and / or reflected by the surface, the received portion of the optical signal having a phase shift and / or Doppler shifted angular frequency due to radial motion of the LiDAR apparatus relative to the surface; at least one photodetector to receive the optical signals received by the optical receivers, interfered with a reference beam, and to generate a corresponding output signal; at least one analogue to digital converter to generate a digital signal representing the output signal from the at least one photodetector; and a digital signal processing component configured to process the digital signal to generate LiDAR data representing the distances to the surfaces and / or relative velocities of the surface(s) with respect to the apparatus.

The invention discloses a vehicle speed detection method, a vehicle and a computer storage medium. The method comprises the following steps: acquiring a road video image; performing feature point detection on the road video image, and removing motion feature points in the road video image to obtain effective feature points; and determining the driving speed of the vehicle according to the effective feature points. The method can avoid the interference of the motion feature points on the driving speed detection, improves the accuracy of the driving speed detection, and is suitable for an outdoor complex environment.

The invention relates to an underground cavern surrounding rock three-dimensional vibration measurement method and device, and the method comprises the steps: generating a light spot meeting a preset clear condition through beam splitting laser; acquiring the vibration condition of the laser source and the vibration condition of the photographic lens; cutting the tracking record image of the light spot, and respectively calculating the relative displacement time history of the feature points and the boundary of the light spot; based on curvature, length and area changes of the circular light spot in different directions, a vertical relative displacement time travel curve of the light spot perpendicular to the surface of the surrounding rock of the target underground cavern is calculated; and differentiating the obtained plane and vertical displacement time histories to obtain corresponding vibration velocity time histories, and combining to construct the actual three-dimensional vibration velocity of each light spot. According to the embodiment of the invention, the monitoring cost is reduced, the field monitoring efficiency and the monitoring data volume are improved, the applicability in the construction environment with poor light of the underground cavern is higher, the defects of a high-speed photographing single lens in three-dimensional data representation are overcome, and effective monitoring and evaluation of three-dimensional vibration of the underground cavern are realized.

The invention discloses a long-distance motion simulation system high-precision positioning and speed fixing method and device, the device comprises a slide rail, a slide table and a long-distance high-precision positioning and speed fixing unit, and the long-distance high-precision positioning and speed fixing unit comprises a photoelectric position marker, a high-speed signal acquisition and processing unit and a photoelectric encoder; when the sliding table passes through the photoelectric potential marker, a reflecting light path of the photoelectric potential marker is formed by using the light reflecting mirror, so that the photoelectric potential marker generates a pulse signal; the high-speed signal acquisition and processing unit acquires pulse signals in real time, marks time stamps on photoelectric potential marker signals acquired in real time, and determines absolute position data of the sliding table at the moment by taking the pulse signals transmitted by the photoelectric potential marker as a reference; the photoelectric encoder transmits a calculated distance value to the high-speed signal acquisition and processing unit; and obtaining real-time position information and instantaneous speed information of each sensing interval and the average speed of each sensing interval according to the absolute position data and the calculated distance value.

The invention discloses a device and a method for testing initial velocity and distribution of fragments of a warhead, and the device is characterized in that a missile rack is arranged in a light filtering protection device, and is used for fixedly installing the warhead; the light filtering protection device is arranged between the high-speed camera laying room and the anti-reflection background, located on one side of the lens axis of the high-speed camera and used for enabling fragments generated by warhead explosion to penetrate through the space between the high-speed camera laying room and the anti-reflection background to shield explosion fire light and detonation products. The phenomenon that the lens of the high-speed camera is covered in the light curtain area of the explosion flame to cause overexposure is avoided, so that fragment flying images can be shot at a short distance. According to the testing device, explosion fire light is weakened through the light filtering protection device, the concentration of detonation products flying along with fragments is reduced, and therefore the fragment scattering process can be shot at a short distance, axial distribution of the initial speed of the fragments is directly calculated, and the fragment scattering angle is obtained.

The invention relates to a device for ascertaining the longitudinal extension and the average speed of a belt and for ascertaining the speed of at least one belt pulley. At least one respective marking part pair is arranged in the tight strand and slack strand over the circumference of the belt, wherein an analysis and regulating unit is configured so as to - ascertain the longitudinal extension of the belt on the basis of the average belt speed, the difference between the running time of two marking parts following one another both in the tight strand and the slack strand, the measuring interval of the marking parts ascertained therefrom both in the tight strand and the slack strand, and the reference interval as the average value from the ascertained measuring variables and - ascertain a tensile force and a difference in the tensile force in the tight strand of the belt using the analysis and regulating unit via a spring rigidity which is assigned to the belt and is stored in the analysis and regulating unit and a difference in the intervals of the marking parts in the tight strand. The analysis and regulating unit is also configured so as to ascertain a slip between the belt and the belt pulley on the basis of the ratio of the average speeds ascertained from the belt and the belt pulley.

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 discloses a speed measurement positioning method and device for a rack rail train, electronic equipment and a storage medium. Comprising the steps that when the rack rail train runs on the rack rail, a tooth number recognition sensor is used for continuously measuring the tooth number of the rack rail, the running time of the rack rail train passing through a preset interval is calculated, and the tooth number recognition sensor is arranged on the rack rail train; and the real-time speed of the rack rail train is determined according to the running time and the preset distance. Speed measurement of the rack rail train can be efficiently and accurately completed, and the problem that the speed measurement precision of the rack rail train is low is solved.

The invention provides a rapid target calibration method and system for an unmanned aerial vehicle, and relates to the technical field of image processing. The system comprises a visual camera, a calibration prototype, a voiceprint collector, a prototype console, a software monitoring console and a calibration console, and is used for cooperatively verifying whether voiceprint distance measurement and the prototype console are matched in control quantity of a front-back distance, then controlling the unmanned aerial vehicle to fly horizontally through the prototype console, judging whether space angle data is measured accurately, and finally, determining whether the unmanned aerial vehicle flies or not. Corresponding prototype position information and prototype speed information are calculated based on the accurate relative distance data and the space angle data, and then an adjustment basis is provided for the distance parameter, the angle parameter, the position parameter and the speed parameter; according to the method, the advantages of voiceprint distance measurement in linear distance and the advantages of image comparison in plane angle measurement are ingeniously utilized, and the linked data verification logic lines are matched, so that a standardized, rapid and automatic target calibration task can be realized only by means of simple equipment.

The invention discloses an attitude immune pedestrian double-magnetic speed measurement method and device, and belongs to the technical field of indoor pedestrian positioning. According to the method, a static attitude projection method is adopted, and the problems of pedestrian attitude change, magnetometer zero offset and magnetometer installation inconsistency are solved; a double-window weighted dynamic time warping algorithm is adopted, the capacity of capturing the change trend of the magnetic field is improved, the capacity of dynamically adjusting the magnetic field intensity and the contribution degree of the change trend in a cost function is improved, meanwhile, the influence of transient disappearance of the magnetic field gradient on a matching result is reduced, and the matching speed and the matching precision are improved; therefore, the pedestrian movement speed can be accurately estimated.

The invention provides a plate drawing system control method and device for simulating an ice surface system, and the method comprises the steps: determining the first real-time vehicle speed of a target vehicle based on an induction speed measurement unit, and determining the wheelbase between the center point of a front wheel and the center point of a rear wheel of the target vehicle based on a pressure sensor; based on the axle distance between the front wheel center point and the rear wheel center point of the target vehicle and the length of a pulling plate in the pulling plate system in the driving direction of the target vehicle, determining a time point when the front wheel of the target vehicle is not on the pulling plate and the rear wheel of the target vehicle is on the pulling plate, and taking the time point as a pulling plate starting time point; therefore, when the first real-time vehicle speed of the target vehicle is within the preset range, the pulling plate moving instruction is sent at the pulling plate starting time point, so that the pulling plate system controls the pulling plate to transversely move based on the pulling plate moving instruction, transverse traction force can be accurately applied to rear wheels of the target vehicle, and the dynamic performance of the vehicle under the wet and slippery road surface condition can be more truly reproduced.

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.

A circuit for automatically calculating a speed of a rotor includes: an edge generation module configured to receive Hall signals of three phases, and generate an edge response signal for the Hall signal of each phase; a counting module, which is connected to an output end of the edge generation module, configured to count the time difference between two adjacent jumps of the Hall signal of each phase on the basis of an output signal of the edge generation module to obtain a count value of each phase, output the current count value, and generate a trigger signal when the Hall signal of any phase jumps; and a division module, which is connected to an output terminal of the counting module, configured to divide an angle difference between the two adjacent jumps of the Hall signal by the current count value to obtain a rotation speed of an electric motor.

Speed and acceleration calculation and measuring methods and devices based on a regularization algorithm are disclosed. Speed and acceleration are calculated using the following steps: (1) acquiring position data or displacement data; and (2) using the position data or displacement data to calculate the speed and the acceleration with a disclosed regularization method. The disclosed methods and systems avoid the issue of noise amplification that arises when speed and acceleration are measured by existing speed and acceleration devices at high sampling rates. Noise amplification is prevented by first expressing the relationship between position data or displacement data and speed or acceleration into a typical Volterra integral equation of the first kind, and then using the disclosed regularization method to calculate speed and acceleration, thus suppressing noise amplification and accurately extracting speed and acceleration signal values.

A rotating speed estimation method for an incremental encoder includes generating a plurality of pulse signals according to a plurality of square waves, detecting a time length when the pulse signals reach a predetermined number, and generating a rotating speed of a rotating wheel according to the predetermined number, the time length and a total number of pulses when the rotating wheel of the incremental encoder rotates a circle.

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 discloses a vehicle speed prediction-based camera accurate triggering method and an image acquisition system, and the system comprises a speed measurement subsystem which is used for measuring the speed of a train; comprising a high-speed detection sensor group and a low-speed detection sensor group; the high-speed detection sensor group is used for detecting the speed of a train with the speed higher than a speed threshold value, and the low-speed detection sensor group is used for detecting the speed of a train with the speed smaller than or equal to the speed threshold value; the controller is used for predicting the arrival time of the train arriving at a preset acquisition position according to the train speed acquired by the speed measurement subsystem, and calculating the image acquisition triggering time of the image acquisition module according to the arrival time; issuing an instruction for carrying out image acquisition at the image acquisition triggering time to the shooting module; the system further comprises an image acquisition module. According to the invention, accurate speed measurement can be carried out on trains with different speeds so as to predict the time when the trains arrive at the preset shooting place, so that the cameras are accurately triggered to collect train wheel images.

A positioning system and method for a maglev train, the positioning system comprising an onboard magnet mounted at the bottom of a train, two grating arrays laid on train tracks side by side in the traveling direction of the train, an optical pulse generation module and a data processing module. The data processing module performs first-stage train positioning according to drift conditions of the center wavelengths of the marking gratings, performs second-stage train positioning according to drift conditions of the center wavelengths of the first grating array, and performs third-stage train positioning according to drift conditions of the central wavelengths of the second grating array, so as to determine the track positions where the train arrives step by step.

The invention discloses a ship navigational speed segmented measurement method suitable for an arc-shaped navigable tunnel test, and relates to the technical field of engineering measurement, and the method comprises the following steps: dividing a navigable arc-shaped segment of a tunnel into a plurality of uniform measurement segments, and erecting a laser range finder at the front end of each measurement segment; presetting an acquisition sequence, and sequentially acquiring distance data measured by the laser range finder when the test ship sails based on the preset acquisition sequence; based on the distance data measured by the laser range finder, the arc length of the test ship passing along the channel center line at any time position point is obtained; and obtaining the ship navigational speed based on the ratio of the arc length to the test ship navigational time. Through segmented measurement, real-time data acquisition and navigational speed calculation based on the arc length, the ship navigational speed measurement method with high adaptability, high precision and high real-time performance is provided for an arc-shaped navigational tunnel test, the defects in arc-shaped navigation channel measurement in the prior art are overcome, and the method has remarkable practical application value.

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 discloses an E-bike wheel speed detection device based on photoelectric induction, comprising a photoelectric sensor and a reflective strip; the reflective strip is arranged on a wheel hub, and the photoelectric sensor is fixed to a frame; the photoelectric sensor comprises a transmitting component and a receiving component; the reflective strip can rotate with the wheel hub to correspond to the infrared transmitting component, when the reflective strip corresponds to the transmitting component, the transmitting component emits infrared light, and after being reflected by the reflective strip, the receiving component receives the reflected infrared light reflected by the reflective strip; the wheel speed is calculated by the time interval between two detected reflective strips, and the sensing distance between the photoelectric sensor and the reflective strip can be adjusted; the shape of the wheel hub does not need to be changed, and the device is suitable for most wheel hubs, and is also suitable for various types of E-bikes with external speed measurement.

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 provides a water system for simulating an ice surface system, which is characterized in that a water system groove and a water system functional area are arranged, and a plurality of water film nozzles and water barrier nozzles are mounted in the water system groove; the water film nozzle is used for arranging a water film at a corresponding position in the driving direction of the target vehicle according to the water film arrangement instruction, and the water barrier nozzle is used for arranging a water barrier at a corresponding position on a preset road surface according to the water barrier arrangement instruction; the water system functional area comprises a valve well, a sedimentation tank and a water storage tank; the valve well is used for injecting water into the water system groove and the reservoir, the reservoir is used for supplying water to the water film nozzle, and the water system groove is used for supplying water to the water barrier nozzle; the sedimentation tank is connected with the water system groove through a water return pipe, and the sedimentation tank is used for collecting water flowing back from the water system groove and enabling the water flowing back from the water system groove to flow into the reservoir; and the reservoir is connected with the water film nozzle of the water system groove through a water purification pipe, so that the slippery range and the slippery degree of the road surface can be safely and controllably controlled.

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 utility model provides positioning and speed measuring equipment for a high-speed moving object. The positioning and speed measuring equipment comprises a laser target assembly, a power box, a control box and an upper computer, the power box is electrically connected with the laser target assembly, the laser target assembly is connected with the control box, and the control box is connected with the upper computer. The laser target assembly comprises a first laser, a second laser, a first light curtain and a second light curtain, the first laser and the first light curtain are opposite and located on a first plane, the second laser and the second light curtain are opposite and located on a second plane, and the first plane is parallel to the second plane. According to the positioning and speed measuring device for the high-speed moving object, the laser curtain serves as a target surface, when a bullet penetrates through the laser curtain, luminous flux received by the photoelectric receiving part changes and is converted into electric signals through the photoelectric conversion element, then the coordinates of an impact point are determined according to the changes of the electric signals, the timing unit is triggered and stopped, and the bullet can be accurately positioned. The method is not influenced by weather, and the accuracy and the stability of measurement are ensured.

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.