16 results about "Speed measurement" patented technology

A method for dynamically distributing speed measurement source of network speed measurement system includes sending speed measurement request message with user ID to control server by user, confirming whether available speed measurement server is existed or not by control server and executing speed measurement task by user if it is, removing user off from user queue when preset maximum execution time of speed measurement task is reached, updating bandwidth and minimum waiting time of each speed measurement server in speed measurement server queue then executing said removing off step cyclically.

The invention provides a part size measurement method based on a charge coupled device (CCD). According to the part size measurement method, feature point recognition technology is adopted, pixels are classified through feature points of a part, the size of the whole part is measured, prior knowledge of the part is not required, and measurement for the common part is achieved. According to the method, high-speed measurement is conducted, and meanwhile a precision requirement is met. The part size measurement method based on the CCD is simple in algorithm, low in cost and good in application prospect due to the facts that only the CCD and a computer are required for hardware implementation and a complex mechanical structure is not required.

The invention provides a speed measurement method for measuring the speed by the adoption of two cameras. The method comprises the steps that the first camera and the second camera are adopted for capturing images of a moving object to be measured; according to a point to be measured on the object to be measured, the azimuth angle of inclined light, incoming to the first camera, of the point to be measured on the object to be measured and the azimuth angle of inclined light, incoming to the second camera, of the point to be measured on the object are obtained according to the positions of the images, generated in the first camera and the second camera, of the object to be measured, and position coordinates, on different measurement points of a movement track of the point to be measured, of the point to be measured on the object to be measured are obtained; according to the position coordinates, on different measurement points of a movement track of the point to be measured, of the point to be measured on the object to be measured, the sum of the distance between adjacent measurement points of the point to be measured of the object to be measured is obtained, and the movement speed of the object to be measured is obtained according to measurement time. The invention further correspondingly provides a speed measurement device and a terminal. According to the speed measurement method and device and the terminal, the movement speed of the object, to be measured, in curvilinear movement can be measured by the adoption of the cameras.

The present invention relates to a single horizontal array passive speed measurement and distance measurement method based on sound field interference fringe, belonging to the field of underwater acoustic engineering and sonar signal processing. The method comprises a step of carrying out condition processing and collection on the signal received by each array element of a sonar, a step of carrying out beam formation on the collected signals and obtaining an azimuth time journey map after accumulation, a step of tracking an interested object, taking a tracking beam as object azimuth estimation, carrying out short-time Fourier transform spectrum analysis on the output of the tracking beam, obtaining the interference structural map of the interested object, selecting two equal time intervals of a single horizontal array in a motion process, forming interference structural maps, carrying out preprocessing and Radon transform on the two interference structural maps, and estimating an object heading angle with the combination of the waveguide invariant theory, and a step of realizing the estimation of the distance and speed of the interested object. According to the method, the physical nature of an underwater sound field is fully dug, the prior knowledge of a marine environment is not needed, the algorithm is simple and easy and is convenient and flexible to use, and the application prospect is wide.

The invention is suitable for the radar technology field and provides a speed measurement method applied to a radar, a speed measurement device, electronic equipment and a computer readable storage medium. The speed measurement method comprises the following steps of based on the track information of a target, calculating the distance change rate of the target; based on the distance change rate, calculating the speed blur multiple of the speed measurement value of the target; and according to the speed blur multiple, carrying out speed deblur and acquiring the real speed of the target. In theinvention, the speed measurement range of the radar can be effectively increased and the application demand of a vehicle-borne radar is satisfied.

The invention provides a vehicle positioning and speed measuring system and method based on a grating array sensor. The system comprises a grating array module, a real-time data acquisition module, a vehicle position determination module and a vehicle speed determination module. The grating array module is used for acquiring a vibration signal of a vehicle in real time; the real-time data acquisition module is used for acquiring a vibration signal according to a preset acquisition time length and a preset sampling frequency to obtain a vibration sampling signal; the vehicle position determination module is used for determining the vehicle position based on the vibration sampling signal; the vehicle speed determination module is used for determining sampling point information corresponding to wheels of the vehicle based on the vibration sampling signals and determining the vehicle speed according to the sampling point information. According to the invention, all-weather monitoring of the vehicle is realized, and the efficiency and precision of positioning and speed measurement of the vehicle are improved.

The invention belongs to the technical field of streetlamps, and particularly relates to a streetlamp capable of monitoring illegal activities on roads. The streetlamp comprises a lamp cover, an illuminating lamp and a lamp pole. A sampling monitor is arranged in the middle of the upper half part of the front face of the lamp pole, and a speed measurement device is arranged in the middle of the front face of the lamp pole. The speed measurement device and the sampling monitor are in series connection and are electrically connected with a power source through a control chip. A buzzer is arranged on the lower half part of the front face of the lamp pole and is connected with adjacent traffic lights through the control chip. When the traffic lights change from green to yellow, the control chip controls the buzzer to give out an alarm, and warnings are given to pedestrians and drivers. The sampling monitor monitors the condition of road traveling and the condition of the pedestrians at any time, and the speed measurement device is used for measuring the traveling speed of drivers; when the traveling speed measured by the speed measurement device exceeds the set maximum speed, the control chip controls the sampling monitor to conduct sampling. Accordingly, the warnings are given to the pedestrians and the drivers, and the probability of running the red light is reduced; furious driving vehicles are also recorded, so that the streetlamp can assist the traffic police in handling the problem of illegal activities on roads.

The invention provides a detection system for tire wear of a straddle type monorail train. The detection system comprises an image acquisition assembly, a synchronous following assembly, a trigger assembly, a speed measurement assembly and a central processing unit, wherein the image acquisition assembly is used for acquiring contour data of train tires; the synchronous following assembly comprises a linear module, a power piece and a displacement measuring device, the synchronous following assembly is used for driving the image collecting assembly and the displacement measuring device to synchronously act along with rolling of train tires; the trigger assembly is used for detecting train entering or leaving the detection area; the speed measuring assembly is used for measuring the speed of the train entering the detection area; the image acquisition assembly, the synchronous following assembly, the trigger assembly and the speed measurement assembly are all connected with the central processor. The detection system is simple in structure and can accurately and efficiently measure the wear condition of the train tires. The invention further discloses a detection method, detection is achieved through the detection system, and practicability is high.

The invention discloses a positive and negative rotation speed regulation control system and method for an AC motor, and the system comprises an AC motor body; the interior of the AC motor body is rotatably connected with an output shaft, the surface of the AC motor body is fixedly connected with a speed measurement box, and the interior of the speed measurement box is provided with a speed measurement mechanism; a speed control mechanism is arranged in the alternating current motor body, and the speed measurement mechanism and the speed control mechanism are controlled through a speed regulation control system. According to the positive and negative rotation speed regulation control system and control method of the alternating current motor, the speed control mechanism is arranged, the air cylinder is used for driving the push rod to move, so that the pressing rods at the two ends rotate with the supporting rod as the center point, and the rotation speed of the output shaft can be adjusted through cooperation of the elasticity of the first spring and the second spring and the contact of the speed reducing plate and the rotating wheel, so that the speed control performance of the alternating-current motor is improved, and the use of forward and reverse rotation adjustment of the alternating-current motor is better protected.

The invention discloses an anti-theft alarm system for radar speed measurement and a control method of the anti-theft alarm system. The system comprises a main control module, a detection module, an alarm module, a heating module and a GPS/GSM wireless communication module. The input end of the main control module is connected with the detection module, the output end of the main control module is connected with the alarm module and the heating module, and the communication end of the main control module is in wireless connection with a background control platform through the GPS/GSM wireless communication module. According to the control method, whether equipment is damaged or stolen or out of power is judged through the detection module, and then whether the alarm module is started or not and whether an alarm message is sent or not are judged. Compared with the prior art, the anti-theft alarm system for radar speed measurement is small in size, a communication card can be additionally arranged for remote communication through the communication module of the system, and indirect control can be achieved through the speed measurement equipment by means of communication with the speed measurement equipment. Meanwhile, a special glass demisting function is added, and the situation that snapshot is affected when water mist appears on anti-blasting glass of the speed measurement equipment in winter is avoided.