There are many security products appear in succession

aiming at current increasing demand of security alarming products

however

most of the front-end detecting equipment has its own disadvantages

a reliable human invasion detecting system is studied

which can solve a series of problems such as misinformation rate

cracking and worse concealment.This system is based on the characteristic that an organism has its own electric fields which will interfere with stable electric fields that already exists

stable electric fields is generated by Schmitt-toggle and power amplifier circuit

once human gets close to the electric fields

system receives invasion signal immediately.After conditioning and amplifier the invasion signal

orthogonal signal detection

feature signal extraction

combined with intelligent algorithms

at last valid and reliable alarming signal is generated.Through test

the system is proved to have good performance such as strong anti-interference

ultra low false alarm rate

non-omission exist and unable to crack

and so on

which is well applied for front-end detecting of security alarm system.