Motion sensors

Today there are many types of detection sensors based on various physical principles (radar, seismic, UHF, infrared, optical, etc.). However, often such problems turn up, which cannot be solved with their help or to be sure of fact of intrusion basing on the information received.

Problem of sensors application in adverse weather conditions is most acute issue as well as usage sensors in areas in close proximity to roads and railways. Another also very problematic issue is target identification in the catchable area of the sensor. Rather often the sensor may make false triggering caused by birds, animals or foliage of trees, despite the fact that many devices have a built-in target selection system.

One of the key issues in target recognition is the volume and heterogeneity of incoming data into processing system or, in other words, the information capacity of the input signal. The use of UWB pulse signal as a source of information is very promising, as it can give much more information than using traditional narrowband UHF signal on the basis of the carrier frequency. In addition to identification ability, UWB sensor has advantage over the radar sensors based on Doppler effect, due to its ability of detecting not only motionless object, but low speed moving object as well. UWB sensors have the following features and advantages:

•  emission security (radio scanner can’t discover it);

•  high-noise immunity;

•  all-weather and around the clock capability;

•  object identification capability;

•  high accuracy of radar range till an object;

•  remote velocity determination;

•  separate monitoring closely located objects;

•  ability to self-disguise.

Thus, UWB sensor is high intelligent anti-intruder device applicable for object security systems.