The working principle of microwave vehicle detector
Microwave (Microwave) refers to the wavelength of 1mm-1m, frequency in the range of 300MHz ~ 300GHz electromagnetic waves, radio waves are divided into meters, centimeters, millimeter waves and sub-millimeter wave collectively. According to the different microwave frequency, can be divided into multiple bands, the performance of each band is quite different, the application area is also very different. Among them, X-band (8-12.5GHz) has the characteristics of small weather factors, high frequency, large bandwidth, easy to achieve integrated design and other characteristics, in the field of target detection has important application value. Microwave vehicle detector detection based on Doppler effect (Doppler effect).
Microwave in the process of transmission, the object will occur when the reflection occurs, the frequency of the reflected wave will change due to changes in the state of the object movement. When the object is fixed, the frequency of the reflected wave is kept constant. when the object moves in the direction close to the wave source, the microwave reflected wave is compressed, resulting in increased frequency; when the object moves away from the direction of the wave, the microwave reflected wave is pulled Stretch, resulting in reduced frequency. The above is the microwave vehicle detector to achieve the physical basis of traffic parameter detection.
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