The radar speedometer commonly known as electronic eye, frequency shift amount calculated based on the received reflected wave derived from the measured velocity of the object. Radar guns are widely used in urban traffic, mainly used for measuring whether the car speeding points fixed and mobile two fixed installation on the bridge or crossroads, the flow is usually installed in patrol cars.

       “ Electronic eye ” Also known as“ Electronic police ” ，is “ The intelligent traffic violation supervision proactive management system ” Commonly known as，1997 in Shenzhen successfully developed gradually promote the use of electronic eye through the vehicle detection, optical imaging, automatic control, network communication, computer and other technology, the motor vehicle through a red light, retrograde, speeding, crossed the line with unauthorized stopsillegal behavior, weather monitoring, capture vehicle violation graphic information, and post-processing based on the illegal information, is a new traffic management mode。.