142results about How to "Accurate speed measurement" patented technology

The invention discloses a method for controlling microwave vehicle detecting radar, comprising the following steps: microwave detecting radar work parameter is evaluated; pulse compression in the range direction is carried out; sub-echo of each target vehicle is respectively extracted, and whether advancing vehicle exists is judged, speed search is carried out on data of each sub-echo of advancing vehicle, one matched filtering function is obtained after each search, pulse compression in the azimuth direction is carried out, and then the kurtosis value is calculated; if the largest kurtosis value is obtained, the search speed corresponding to the largest kurtosis value is the traveling speed of the vehicle, frequency modulation slope in the azimuth direction is calculated according to the speed and pulse compression in the azimuth direction is carried out, and then signals of each range gates are added and are compared with the set threshold to obtain vehicle length; if the largest kurtosis value is not obtained, then search is kept on by returning to the previous step. The invention has numerous monitoring lanes, wide detection range and more precise detecting speed, can detect vehicle with low speed or even standing vehicle precisely, and can estimate vehicle length, thereby facilitating traffic control.

A radar system for motor vehicles, having a radar sensor and an evaluation device for measuring distances and relative velocities of objects in the surrounding field of the vehicle, and a collision detection device, which, on the basis of the measured distances and relative velocities, recognizes an imminent collision and delivers data on the expected time of collision and the impact velocity to a precrash system. The radar sensor is switchable by the collision detection device to a velocity measurement mode in which a more precise measurement of the relative velocity is made.

The invention relates to a traffic monitoring system for speed measurement and assignment of moving vehicles in a multi-target recording module. The object of finding a new possibility for more accurate speed measurement and reliable assignment of vehicles, wherein the problems with regard to assigning speeds to vehicles at relatively great distances and measurement uncertainties associated therewith are reduced, is achieved according to the invention by virtue of the fact that, besides a first, azimuthally measuring tracking radar sensor, at least one further tracking radar sensor having an antenna structure that is of the same type but is operated at a different frequency is arranged in a manner rotated by a defined angle relative to the antenna structure of the first tracking radar sensor, such that the further tracking radar sensor forms an antenna structure for acquiring at least one signal component for the reconstruction of vertical distances, extents and elevation angle positions of the moving vehicles and provides measurement data at its sensor output.

The invention provides a spherical-wheel mobile robot and a speed measuring method thereof. The spherical-wheel mobile robot comprises a spherical wheel, a driving mechanism for controlling the spherical wheel to move according to a control signal, a robot body for supporting all structures, a control module and an inertial sensor for obtaining posture data of the robot body; and the spherical-wheel mobile robot further comprises a speed measuring mechanism used for obtaining the speed of the spherical wheel relative to the robot body. The control module obtains the solved speed omega of the spherical wheel through a linear equation based on a kinetic constrained relationship according to the speed, obtained through the speed measuring mechanism, of the spherical wheel relative to the robot body and the posture data, obtained through the inertial sensor, of the robot body, and then the control signal for movement of the spherical-wheel mobile robot is solved through the solved speed of the spherical wheel and the posture data, obtained through the sensor, of the robot body in cooperation with the motion control rule, and the control signal transmitted to the driving mechanism. By means of the spherical-wheel mobile robot and the speed measuring method, the accuracy and the reliability for measuring the spherical speed of the spherical wheel during walking of the robot are improved.

The invention provides a device and method for measuring speed of running objects. The device main comprises: laser beam processing module for respectively transmitting a first laser beam and second laser beam from running objects of different direction to ground and receiving the scattering return light of the first laser beam returned from the ground and scattering return light of the second laser beam; computation processing module for calculating the doppler frequency difference of the scattering return light of the first laser beam and scattering return light of the second laser beam; obtaining the running speed of the objects based on the doppler frequency difference. The speed of the objects can be accurately measured and the accuracy of measurement is not sensitive to the sway and bump of running objects.

The present invention discloses a bicycle speed measurement apparatus, which comprises a microprocessor module, a liquid crystal display module, a sensor module and a key input module, wherein the sensor module comprises a Hall sensor, a voltage comparator and a reference voltage circuit, the microprocessor module is connected with the liquid crystal display module, the key input module and the voltage comparator, the voltage comparator is connected with the Hall sensor and the reference voltage circuit, the output terminal of the Hall sensor is connected with the positive input terminal of the voltage comparator, the output terminal of the voltage comparator is connected with the external counter interface of the microprocessor, and the liquid crystal display module and the key input module are connected with the digital I/O port of the microprocessor module. With the bicycle speed measurement apparatus of the present invention, the user can check the time, the bicycle speed, the mileage and other riding data during the riding so as to remind the user to maintain the speed and improve the safety, and the set data can be modified according to the requirement so as to achieve the accurate speed measurement purpose. The bicycle speed measurement apparatus of the present invention can further be used in vehicles, motorcycles, motors and other places requiring rotation speed measurement.

The embodiment of the invention discloses a method for detecting the network speed under a WiFi hotspot. The method comprises the following steps of: detecting a WiFi signal, obtaining a detected WiFi hotspot according to the WiFi signal, and selecting the detected WiFi hotspot to access; obtaining a network IP address corresponding to the accessed WiFi hotspot; obtaining a network speed quality parameter corresponding to the WiFi hotspot according to the network IP address; and, when the network speed quality parameter is less than a pre-set threshold value, executing a step of detecting the WiFi signal, and re-selecting the WiFi hotspot to access. The embodiment of the invention further discloses a device for detecting the network speed under the WiFi hotspot. By means of the embodiment of the invention, the internet access speed when a network is accessed by using the WiFi hotspot can be increased.

The invention relates to an accurate speed measurement method and an accurate speed measurement system of a large laser spot. The accurate speed measurement method and the accurate speed measurement system of the large laser spot are used in speed measurement of a vehicle. The accurate speed measurement method of the large laser spot includes following steps: controlling a laser sensor to send out a pulse laser towards a vehicle moving route, and enabling the pulse laser to form the large laser spot above 1m in diameter on the vehicle moving route when no vehicle runs on the vehicle moving route; monitoring situations of a vehicle head when the vehicle head drives into the light spot and moves in the laser spot, obliquely projecting the pulse laser onto the vehicle head, measuring a laser return distance value Ln of the vehicle head at each time point in a moving time segment of the vehicle head in the laser spot, and forming a vehicle head-time pulse waveform map; performing analytical calculation according to the vehicle head-time pulse waveform map, position parameters of the laser sensor and dimension parameters of the light spot so as to obtain speed of the vehicle when the vehicle passes through the laser spot. The accurate speed measurement method of the large laser spot uses the large laser spot to measure the speed, can guarantee that the laser is projected to the same portion of different vehicles, figures out an accurate traveling distance, obtains an accurate speed measurement value, is simple and quick in speed measurement operation, and obtains an accurate and reliable measurement result.

An optical particle counter determines the velocity of particles passing through a particle detection zone, and thereby the velocity of gas flow, from both the measured time of flight of discrete particles and also the size of intensity peaks of scattered light. This is used to determine particle concentration and may be used to control an optional fan.

The invention relates to a shoulderless and brushless hub motor for an electric bicycle, belonging to the technical field of a motor for a direct-current electric bicycle. The invention is characterized in that the mandrel of the motor is in a shoulderless structure; a clamp spring for a lugless shaft, which is butted and matched with the inner end of a clutch, is clamped on the mandrel; a conical hub with a conical open structure is sleeved on the mandrel; the conical hub is connected with a conical end cover to form a shell; the conical hub is in clearance fit with a built-in magnetic yoke assembly and is in transmission fit with a built-in three-planetary gear mechanism; a Hall speed measuring sensor is matched and arranged on a stator bracket; and a signal magnetic sheet is arranged at a position, which is opposite to the Hall speed measuring sensor, on the inner side of the conical end cover. The invention furthest has the advantages that the inner cavity space of the hub is increased through the shoulderless structure of the mandrel and the open structure of the conical hub, and a built-in speed measuring mechanism is adopted; and the hub motor provided by the invention has the characteristics of novel and reasonable structure, reliable efficacy, light weight, small volume, low cost and the like, is accurate in speed measurement, and is an ideal front-end driving device for the electric bicycle, thereby filling the blank of built-in electronic digital speed measurement of the hub motor at home.

The invention discloses a rear axle electrodynamic force drive device of an electric vehicle. The drive device comprises a reducer shell, wherein the reducer shell is provided with two supports, the two supports support a differential shell, a second driven gear is fixed on the differential shell, a transmission shaft is arranged in the differential shell, a first driven gear and a second drive gear are fixed on the periphery of the transmission shaft, the second drive gear is meshed with the second driven gear, the reducer shell is provided with an end face, a cavity is formed on the end face, a shaft hole is formed in the bottom of the cavity, one end of an alternating current motor stator core is connected with the end face, the other end of the alternating current motor stator core is connected with a rear end cover, the rear end cover, the alternating current motor stator core and the reducer shell are fixed through bolts, one end of a rotor shaft of an alternating current motor supports on the rear end cover, the other end of the rotor shaft of the alternating current motor penetrates through the shaft hole to support on the reducer shell, the first drive gear is fixed on the rotor shaft of the alternating current motor, and the first drive gear is meshed with the first driven gear. The electrodynamic force drive device realizes stepless speed regulation, shifting impact is eliminated, and the heat dissipation of a drive motor is ensured.

The invention discloses an ultrasonic three-dimensional fluid imaging and speed measuring method. The method comprises the steps that 1, a fluid tracer is added or generated in a flow fluid; 2, an ultrasonic array energy converter is utilized for conducting 3D scanning on the flow fluid, and ultrasonic original 3D radio frequency data are collected; 3, on the basis of the collected and stored ultrasonic original 3D radio frequency data, a 3D ultrasonic particle picture sequence is formed; 4, on the basis of the 3D ultrasonic particle picture sequence, three-dimensional speed distribution of the flow fluid is calculated.

The invention discloses a full-automatic winding packer which comprises a sequencing mechanism, a winding mechanism, a coil discharging mechanism and a packing mechanism. The winding mechanism and thecoil discharging mechanism are arranged between the sequencing mechanism and the packing mechanism. The full-automatic winding packer comprises the sequencing mechanism, the winding mechanism, the coil discharging mechanism and the packaging mechanism, so that the full-automatic winding packer can be applied to various pipes or wires capable of being wound, completes the links of sequencing, winding, coil changing, packaging and coil discharging under the condition without human assistance, achieves comprehensive and automatic material packaging, and greatly improves the production efficiency; and meanwhile, the sequencing mechanism detects the tension of material pieces through a tension detection device and detects the running states of the material pieces through a speed measurement device. The full-automatic winding packer has the advantages of being simple in structure and accurate in speed measurement, can effectively avoid the problem of winding creases, reduces the reject ratio of products, and saves the production cost.

An alternating current/direct current tachogenerator is disclosed. The tachogenerator comprises an engine base, an external flux-insulation sleeve, an external stator, permanent magnetic steels, a hollow cup-shaped rotor, an internal stator, an internal flux-insulation sleeve, hall elements, a rotating shaft, a left end cover and a bearing, and a right end cover and a bearing, wherein the external flux-insulation sleeve is fixed on the inner side of the engine base; the external stator is fixed on the inner side of the external flux-insulation sleeve; the permanent magnetic steels are embedded in clamping grooves among the parts of the external stator; the internal flux-insulation sleeve and the right end cover are fixed; the internal stator is fixed on the outer side of the internal flux-insulation sleeve; the hall elements are embedded in the clamping grooves among the parts of the internal stator; one end of the rotating shaft passes through the left end cover bearing while the other end of the rotating shaft passes through the cup bottom of the cup-shaped rotor, the central through hole of the internal flux-insulation sleeve and the right end cover bearing; and the cup wall of the cup-shaped rotor is positioned an gap between the internal stator and the external stator. The alternating current/direct current tachogenerator provided by the invention can convert the rotating speed into the corresponding alternating current or direct current electric signal to output according to needs, is free of a reversing device, a winding, a toothed slot and residual voltage, and capable of accurately measuring the rotating speed at a low speed.

The invention relates to a precisely controlled intelligent four-rotor unmanned aerial vehicle. The precisely controlled intelligent four-rotor unmanned aerial vehicle comprises a deflection measuring mechanism and a plurality of flight units; the deflection measuring mechanism comprises a light reflecting plate and a deflection measuring assembly; the deflection measuring assembly comprises a driving unit, a moving block, a hinge block, a rotating rod, a sleeve and a first photoelectric sensor; each flight unit comprises an auxiliary speed measurement unit on a side rod and a speed reducing unit on a first driving shaft; each auxiliary speed measurement unit comprises a supporting rod, a resistance rod, a transverse rod and a second photoelectric sensor; according to the precisely controlled intelligent four-rotor unmanned aerial vehicle, the inclination degree of an unmanned aerial vehicle is accurately controlled through the deflection measuring mechanism, the rotating speed of the first driving shaft in each flight unit is detected through the corresponding auxiliary speed measurement unit, and a speed is reduced to different degrees by utilizing the speed reducing unit, so that each flight unit is regulated to keep the unmanned aerial vehicle horizontal; the wind strength in each direction is detected through a wind detecting unit; the rotating speed of paddles in each flight unit is regulated again; therefore, precise operation of the unmanned aerial vehicle is realized.

An FMWC radar sensor for motor vehicles, having a high-frequency oscillator, which is developed to generate a frequency-modulated transmit signal that has a periodically repeating series of modulation sequences having different modulation patterns, and having an evaluation device for evaluating the received radar echo according to the FMCW principle, wherein the series of the modulation sequences includes a special class of modulation sequences whose duration is longer than that of any other modulation sequence not belonging to this class and whose frequency swing is smaller than that of any other modulation sequence, and the evaluation device is developed to carry out a measurement of the ego velocity of the vehicle on the basis of a radar echo that is received from non-moving objects during the modulation sequences that belong to the special class.

A locomotive axle end structure on which a six-channel Hall speed sensor can be additionally mounted comprises an axle, an axle end gland, a gear plate, a front cover and a back cover. A through hole used for positioning the gear plate is distributed in the middle of the axle end gland, an axle positioning hole in which an axle is positioned is bored in the back of the axle end gland, and the axle end gland and the axle are fixed together; a square hole allowing the installation of a square falcon component is formed in the center of the front of the gear plate, the center of the back of the gear plate is arranged to extend to form a section of positioning shaft for the axle end gland, and the positioning shaft is matched with the positioning through hole in the gear plate on the axle end gland, to position the gear plate; mounting holes for the six-channel Hall speed sensor are formed in the side of the front cover, and the distance between the mounting surface of the mounting holes and the central axis of the front cover not only guarantees the effective induction distance of the six-channel Hall speed sensor, but also can avoid the interference of the sensor and the gear plate; the square falcon component of the six-channel Hall speed sensor is fixed into the square hole of the gear plate when the six-channel Hall speed sensor is fixed on the front of the front cover.

PCT No. PCT/EP97/00152 Sec. 371 Date Jun. 2, 1998 Sec. 102(e) Date Jun. 2, 1998 PCT Filed Jan. 15, 1997 PCT Pub. No. WO97/26543 PCT Pub. Date Jul. 24, 1997A magnetic pole rotor having a plurality of magnetic poles which are arranged on a base ring. The technical problem is to construct the magnetic pole gear such that a non-rotational connection to the shaft remains assured, even at high operating temperatures. A plastics ring (5) surrounding the magnetic poles is pressed onto a cylindrical surface (2) of the base ring (1) and a cage ring (6) covers the plastics ring (5).

Embodiments of the invention provide an estimation method and an estimation system for absolute speed of an obstacle, computer equipment and a storage medium. The estimation method for the absolute speed of the obstacle can include the following steps: measuring the absolute speed of a motor vehicle at a current time t1 by utilizing integrated navigation equipment, and storing the absolute speed in a data table; obtaining the relative speed of the obstacle relative to the motor vehicle at a second time t2 by utilizing a millimeter wave radar; correcting the relative speed at the second time t2to the relative speed at the current time t1; and adding the absolute speed of the motor vehicle at the current time t1 and the relative speed at the corrected current time t1 of the obstacle to obtain the absolute speed of the obstacle at the current time t1. By means of the technical solution of the method and the system, measurement of the speed of the obstacle is more accurate.

The invention discloses an intelligent traffic congestion drainage method based on geomagnetic information. The method comprises the following steps: 1, measuring an average driving speed vR of an automobile in a road R by use of a geometric sensor; 2, sending the measured average vehicle speed vR in the road R to a signal lamp controller of an upstream crossroad through a wireless sensing network; and 3, assuming that a vehicle average driving speed on the road R in one day under a normal condition is v, the signal lamp controller adjusting a signal lamp of the upstream crossroad through comparing vR with v so as to realize traffic congestion drainage. According to the invention, the method can improve city traffic conditions and avoid traffic congestion and road obstruction, improves the pass capability and the operation efficiency of a road network and promotes coordinated development between city traffic and city construction.

The invention discloses a locomotive benchmarking method and system based on UWB positioning. According to position information of a UWB base stations and a real-time distance between a UWB label andeach UWB base station, the real-time spatial position of the UWB label under a WGS coordinate system or a three-dimensional coordinate system can be obtained. The real-time speed of a locomotive can be obtained according to a sampling period and the real-time spatial position of the UWB label, and finally a traction/braking force required for locomotive pull-in benchmarking is calculated accordingto the real-time spatial position of the UWB label and the real-time speed of the locomotive, so that traction/braking control over the locomotive is realized, and accurate benchmarking parking is realized; for locomotives, especially locomotives running on curved tracks, the benchmarking method can more accurately obtain the spatial position information of the UWB labels under a WGS coordinate system or a three-dimensional coordinate system, and more accurately realize positioning and speed measurement of the locomotives, thereby realizing one-time accurate benchmarking and parking of the locomotives.