In addition, a lidar beam can capture a vehicle's license plate and even an image of the driver. Lidar, a technology used to create 3D topographic maps, sends out a laser beam that can be directed at a single object to detect its speed within 1.9 miles per hour. Radar guns have been used by police for more than 50 years, and as radar detectors have improved, law enforcement agencies have added lidar guns to their arsenal. The radio waves present in any one area – TV and radio signals, garage door opener signals, and so on – can create many false alarms, but some newer radar detectors can differentiate between various kinds of electromagnetic waves to limit the number of errors. Newer, high-end radar detectors can also send out jamming signals that block the radar from tracking a car equipped with such a device. Using the Doppler shift, a radar gun measures the distance and speed between the electromagnetic beam sent out by the handheld gun to a passing car and then back to the device.ĭepending on the sophistication of the device, a radar detector can alert a driver via a panel that signals the presence of police radar as well as the posted speed limit and the car’s current speed. How radar detectors workĪ radar detector is an in-car device that identifies many of the radar guns used by law enforcement to measure the speed of a passing car. It operates in the 10.5-GHz to 10.55-GHz part of the radio spectrum and has become easier for law enforcement to spot. X-band is the oldest radar technology and dates back to the 1950s.
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