WEFOUNDCop Radar-Speed Detector


How does police radar work? It’s not magic – it’s science. Learn how the radar gun reads your speed, and discover how you can use technology to outsmart the system.

A police radar gun is a simple radar unit, which sends out a continuous radio frequency (RF) signal – a radio wave. This RF signal shoots out of the radar gun via the transmitter antenna towards another object, such as your speeding car on the highway. The radar wave hits your car, and then bounces back towards the radar gun.

The police radar is an “autodyne” receiver. This means that it sends out a signal, and then mixes the signal that bounces back from your car in order to determine its speed via the Doppler shift.

Unlike police laser , police radar directly determines a vehicle’s speed by measuring the doppler (speed induced) shift of the return of its transmitted frequency (think of the sound you sometimes hear of an approaching or receding train or emergency vehicle).

Police radar can be operated in two modes. The first is continuously transmitted or constant-on (CO) operation. Generally police radar such as this is easily detected at great distance with a radar detector.

There are certain speed traps that utilize constantly transmitting police radar (ie; CO radar) that are designed to be harder to detect by those who use radar detectors. Police can operate constant-on radar from a “covered” position—hiding amongst heavy foliage of a median, for example, and pointing their gun across the roadway at an angle—not directly at approaching vehicles. Such trap configurations can be very hard to detect even with the best radar detectors. It is not uncommon to encounter state troopers in New Jersey operating police radar in this manner.

How does police radar work? It’s not magic – it’s science. Learn how the radar gun reads your speed, and discover how you can use technology to outsmart the system.

A police radar gun is a simple radar unit, which sends out a continuous radio frequency (RF) signal – a radio wave. This RF signal shoots out of the radar gun via the transmitter antenna towards another object, such as your speeding car on the highway. The radar wave hits your car, and then bounces back towards the radar gun.

The police radar is an “autodyne” receiver. This means that it sends out a signal, and then mixes the signal that bounces back from your car in order to determine its speed via the Doppler shift.


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