It can be widely used for traffic information detection of urban roads and highways.
The Microwave Vehicle Detector (RTMS) works by using a side-mounted type that emits continuous low-power modulated microwaves in the sector and leaves a long projection on the road. The RTMS divides the projection into 32 layers with a “layer” of 2 meters. The user can define the detection area as one or more layers. The RTMS measures the traffic information of the target according to the echo returned by the detected target, and sends it to the control center through RS-232 at intervals. Its speed detection principle is: a fixed length of vehicle is assumed according to all models in a specific area, and the speed of the vehicle is calculated by sensing the time of entry and departure of the vehicle in the projected area. An RTMS side sill can simultaneously detect traffic, road occupancy and vehicle speed for 8 lanes.
The measurement method of the microwave vehicle detector (RTMS) is high in the model, the traffic flow is stable, and the road speed is evenly distributed on the road. The accuracy is high, but in the traffic congestion and the roads with large vehicles and uneven distribution of vehicles, due to occlusion, measurement accuracy Will be affected by a relatively large impact. In addition, the microwave detector requires 3m of space from the nearest lane. If 8 lanes are to be detected, the distance from the nearest lane is also 7-9m and the installation height is required. Therefore, the installation of bridges, interchanges, and elevated roads is limited, installation is difficult, and the price is relatively expensive.
Video detector
The video vehicle detector uses a video camera as a sensor to set a virtual coil in the video range, that is, a detection area. When the vehicle enters the detection area, the background gray value changes, thereby knowing the existence of the vehicle and detecting the traffic of the vehicle. And speed. The detector can be installed on the top and side of the lane. Compared with the traditional traffic information collection technology, the traffic video detection technology can provide the video image on the spot. The detection coil can be moved as needed. It is intuitive and reliable, easy to install, debug and maintain, and cheap. The advantages are that it is easily affected by environmental factors such as bad weather, lighting, and shadows. The dynamic shadow of the car will also cause interference, and the correct detection rate will be degraded or even impossible to detect due to bad weather. The rate of false positives is also greatly affected by environmental factors such as lighting and shadows.
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