Microwave motion detectors are attractive alternatives to other detectors. They provide larger coverage and operate over wider temperature range under environmental influence, such as wind, dust, snow, acoustic noise, moisture, etc. The operating principle of microwave motion detector is based on Doppler-effect as these detectors respond only to moving targets.

1. What is Doppler sensor module?
2. How to calculate target speed?
3. What can I do with Doppler sensor module?
4. Allocated Frequency for Movement Detection.
5. What is the typical diagram for sensor application?

1. What is Doppler sensor module?

When a transmitted signal of frequency from the sensor module is incident on a target that is either approaching or receding from the sensor, the frequency of the reflected signal becomes and is received by the sensor module. The sensor module is able to detect the frequency shift and produce an output for user's further processing.

2. How to calculate target speed?

 

Input your parameter and calculate the doppler shift.

	=		m/s inch/s km/h
	=		deg rad
	=		Hz GHz
	=		Hz

3. What can I do with Doppler sensor module?

The Doppler frequency shift can be unutilized to design low cost radar for intruder alarms, speed detectors, and traffic signal control.

4. Allocated Frequency for Movement Detection.

X Band :

K Band :

Note:

1. Though same frequency is allocated in some countries, national regulations may specify different EIRP, spurious emission or other requirements.
   
   
2. ETS 300 440 is the recommended harmonized standard for European Community, member country may adopt their own national regulation.
   
   
3. The regulations are subjected to change from time to time, please contact appropriate authorities for full and up-to-dated information.
   
   
4. Useful websites:

5. What is the typical diagram for sensor application?