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Technology
Microwave detection: how does it work?
Microwave detectors are based on a physical phenomenon known as the “Doppler” effect : when radio waves emitted from a fixed source are reflected by a moving object, the frequency of the reflected waves is different from that of the emitted waves.

This frequency shift is directly proportional to the speed of the moving target. Furthermore depending on whether the object is moving towards the source or away from it, this difference will be positive or negative.

A microwave detector consists of a high frequency (K-band : 24,125 GHz) transmitter-receiver that constantly analyses the frequency shift between the emitted and reflected waves. It hence measures the speed and detects the direction of the moving object.

By using sophisticated algorithms and signal analysis techniques Icoms radars also measure the length of vehicles for classification purposes.

Radar Technology: Doppler radar
For more information on the microwave technology and its applications, go to the “Links” section of our website where you will find several specialised references.

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