Description: Microwave sensors are motion detection devices that flood an area with an electronic field. Any movement in the zone disturbs the field and sets off an alarm.
There are two basic types of microwave sensors: Monostatic sensors, which have the transmitter and receiver encased within a single housing unit, and Bistatic sensors, in which the transmitter and receiver are two separate units.
Classification: Active - Overt - Line of Sight
Application: Bistatic units provide high security, long range volumetric protection to flat areas - Monostatic units provide isolated, rapid deployment protection & can be used to guard against overhead intrusion.
Advantages: Large area (up to 500m), volumetric protection, difficult to determine area of protection, quick to deploy.
Possible Causes of Nuisance Alarms: External electrical fields (radio transmitters etc.) or magnetic fields (large electric motors or generators etc.), moving objects and debris, movement of mounting posts.
Methods of Defeat: Slow rate of movement, blind spots, tunnelling or bridging.