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1327results about "Devices using time traversed" patented technology

Expressway audio vehicle detection device and method thereof

The invention relates to an expressway audio vehicle detection device and a method thereof. By the aid of the detection device, a microphone array signal acquisition module acquires an audio signal on a lane, the audio signal is subjected to band-splitting filtering and framing through a signal processing module after being subjected to de-noising processing through a noise suppression module, cross-correlation processing is conducted among sub-band signals, an audio space spectrogram is obtained, a vehicle detection module tracks a track of the maximum value on the audio space spectrogram and judges whether a vehicle passes, and the vehicle type and the vehicle speed are obtained through a vehicle type recognition module and a vehicle speed recognition module if the vehicle passes. The detection method is based on the device, a minimum statistical noise estimation method of the adaptive window length is adopted, the signal which is subjected to noise suppression processing is subjected to band-splitting filtering and framing processing, then cross-correlation processing is conducted among same sub-band signals, cross-correlation results are summed after being subjected to amplitude compression and are unfolded along a timer shaft, and an audio signal space-time spectrum is obtained. The method and the device have the advantages of being low in cost, low in energy consumption,easy to construct, interference resisting, capable of working in all weather and the like.
Owner:TAIKE HIGHWAY SCI & TECH INST BEIJING CITY +1

Measuring method and system based on image identification

The invention provides a measuring method based on image identification. The steps are that: shooting the images of a reference object and a to-be-detected object in the same shooting window, wherein the distance of the reference object and the shooting window and the distance of the to-be-detected object and the shooting window are the same; respectively calculating the occupied pixel number of the reference object and the to-be-detected object in the images; identifying the reference object, and acquiring the actual data of the reference object; confirming the corresponding actual data of each pixel inside the images according to the actual data of the reference data; and confirming the actual data of the to-be-detected object according to the corresponding actual data of each pixel. Due to the fact that the images of the reference object and the to-be-detected object with the same distance to the shooting window are shot in the same shooting window, according to the known actual data of the reference object and the pixel number of the reference object in the images, the corresponding actual data of each pixel in the images are calculated, and then, the pixel number of the to-be-detected object is combined, and therefore the actual data of the to-be-detected object can be confirmed.
Owner:北京华力必维科技股份有限公司

High-precision speed measurement positioning method and system for medium and low-speed maglev trains

The invention discloses a high-precision speed measurement positioning method and a high-precision speed measurement positioning system for medium and low-speed maglev trains. The method comprises the following steps of: spreading metal tooth groove bars on a running track of the train, and arranging over two speed measurement positioning sensors on a train body; and cooperatively generating detection signals when the train runs and the speed measurement positioning sensors are close to the metal tooth groove bars, and judging the speed, relative position and direction of the vehicle body according to the detection signals. The system comprises the metal tooth groove bars fixed on the track, the over two speed measurement positioning sensors arranged on the train body and a signal processing unit; when the speed measurement positioning sensors are close to the metal tooth groove bars, periodic sinusoidal signals and periodic on-off signals are cooperatively generated and output to the signal processing unit; and the signal processing unit judges the speed and the position of the train body according to the received sinusoidal signals and the received on-off signals. The system has the advantages of simple and compact structure, low cost, high measurement precision, convenient installation, strong anti-jamming capability and the like.
Owner:NAT UNIV OF DEFENSE TECH +1

Detecting method and system based on binocular camera for real-time vehicle speed

The invention discloses a detecting method and system based on a binocular camera for real-time vehicle speed. The detecting method comprises the following steps: 1) extracting a rectangular frame and a barycentric coordinate entering a visual angle range of the binocular camera, and tracking a target vehicle; 2) recording the position and the time of a vehicle entering or leaving the visual angle range of the binocular camera; 3) pre-building a parallax depth chart of the binocular camera and a proportional relation chart of perpendicular lengths from viewpoints at the depths of the binocular camera to an optical axis and the pixel count of imagery; 4) acquiring parallax of the vehicle entering the viewpoints of the visual angle range of the binocular camera and leaving the viewpoints of the visual angle range of the binocular camera to obtain the perpendicular lengths from the viewpoints of an entering position or a leaving position of the vehicle to the optical axis; 5) calculating a traveling distance between the viewpoints of the entering position and the leaving position of the vehicle, and obtaining the vehicle speed of the vehicle according to the traveling distance and the time of the vehicle. The detecting method and system have the advantages that the speed measuring precision is high, and speed measurement can be performed on multiple vehicle objectives on multilane at the same time.
Owner:SOUTH CHINA UNIV OF TECH

Parameter testing system and method for high-speed moving object

The invention discloses a parameter testing system and a parameter testing method for a high-speed moving object. The system mainly comprises a starting target, a stopping target, a data acquisition module, a master control module and a data transmission processing module, wherein each of the starting target and the stopping target consists of an X-axis and Y-axis rectangular laser light curtain emission unit, an X-axis and Y-axis photosensitive tube array and an amplification shaping unit; the starting target and the stopping target form two parallel virtual thin light curtain target surface which are at a determined interval; the data acquisition module consists of a plurality of field programmable logic arrays (FPGA) with built-in first in first out (FIFO) buffer memories; the master control module consists of an FPGA and a memory FLASH; and the data transmission processing module comprises a universal serial bus (USB) data interface and an upper computer. According to the system, the output level state of the X-axis and Y-axis photosensitive tube array at each moment when the object flies through thin light curtain areas is acquired and stored at high speed under the control of the FPGA of the master control module, and the speed of a fragment, landing coordinates and an overall dimension are calculated by data processing.
Owner:ZHONGBEI UNIV
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