The basics of electronic dog products (b)

This method is classic, detected with good results. Shanghai, Guangdong and other regions such as southern China, such as the use of this method. According to vehicle speed parallel to the coil to determine whether speeding, and video evidence. The disadvantage of this detection method is the construction of the induction coil is the ground-laying capacity, once the road to change you need to re-buried coil, and other high-latitude open thaw and low-latitude summer road and pavement quality poor maintenance of the coil is enormous.

    The method of continuous video image analysis, tracking the behavior of illegal vehicles, through the analysis of control camera illegal capture. The advantages of the system is not subject to road conditions, the installation does not require destruction of the road, or an induction loop buried under the road, erected in the road above the cameras to detect traffic data, a new generation of road vehicles detection. The disadvantage of the video is there are certain difficulties in the identification of the moving vehicle. On one hand, in the fast-moving vehicles need to have a fast enough shutter (at least 1/3000PX) a sufficient number of pixels and image algorithms; the other hand, in the intersection, crossing, and import and export of the highway, the vehicle's speed is generally slow, the more common violations of red light running, and illegal line and error to select lane, these acts do not need radar with high-speed camera, using a slower shutter can achieve the purpose of monitoring. In addition, the video technology to the light and weather.

    The difference with the video detection, intersection usually multi-lane, and the complexity of multi-vehicle, pedestrian. Single use of the Doppler effect microwave radar detection of the junction of illegal vehicles also have greater difficulties, and for faster, the direction of a single highway, microwave radar is the best partner with the high-speed camera, high-speed camera to accept to microwave radar to detect fast-moving vehicles, quick access to fast capture state with the high-speed shutter illegal evidence collection. Mainstream products on the international radar with high-speed camera to take pictures of speeding.

    The main use of ultrasonic distance measurement principle. The ultrasonic sensor head in a great intersection of this dust in the harsh environment of life at most a few weeks, so the detection method does not apply.

    The main use of ultrasonic distance measurement principle. The ultrasonic sensor head in a great intersection of this dust in the harsh environment of life at most a few weeks, so the detection method does not apply.

    The so-called radar gun, the frequency shift calculation is based on the received reflected wave arrived at the velocity of the object. Popular, is erected in the road next to the radar transmitter, transmit radar beam in the direction of the road to the car, and then receives the reflected echoes of the car and echo analysis to determine the vehicle speed,Main products: car dvd player and car dvd , are with good quality.  such as the speed exceeds the set value, the instruction on the camera shooting (evening at the same time trigger the flash). At present, the police use radar guns divided into two kinds of fixed and mobile, fixed installation in the bridge or a crossroads, the flow is usually installed in patrol cars.