The Study And Design Of Perimeter Security System Based On MEMS Sensor

MEMS,is also called Micro-Electro-Mechanical System,it is developed based on microelectronics technology,integration of lithography,etching,thin film,Liga,silicon micro processing,high-tech electronic mechanical device.MEMS sensors made of non silicon micro machining and precision machining technology in small size,light weight,low cost,low power consumption,high reliability advantages that makes its use in perimeter security field more and more widely.With the development of science and technology,criminal means increasingly diversified,full of science and technology,which makes the property of state and the property of citizens be threatened.Among them,the invasion crime of state important facilities,Citizen residence is particularly prominent in recent years.Perimeter security system is the first line of defense to prevent foreign invasion,therefore,its importance is self-evident.The main task of perimeter security system is that it can detect the intrusion signal timely and accurately and sends out alarm signal in the intrusion occurs,to remind the security personnel to make further precautions.Perimeter security system now has been widely used in various fields of national important infrastructure,government departments and the people’s life.For example,the border of one country,major military bases,government security units,oil depots,bank vaults,airport,residential area and so on.In the beginning,this work summarized Several kinds of perimeter security system at present on the market,and analyzes their advantages and disadvantages.Through the analysis of the existing perimeter security system,we propose ourselves set of design plans in this work.Based on the specific application scenarios,this plan use MEMS sensor as the perimeter security detector,put it on the particular fence and detect signal of vibration.When we get the signals,the signal is transmitted to the signal processing module and be processed.The signal processing module analyse the signal and summarize its characteristic.Then,Signal processing module output a switch signal to the control of the host.Eventually,system link alarm device alarm.Analyzes the working principle of MEMS acceleration sensor,and design the software and hardware of the signal processing module.The main chip of the processing module is TMS320VC5509A.According to the signal detected,we proposed a signal analysis method called wavelet packet transform.Using wavelet packet transform,we can get the characteristic of vibration signal.For the data produced by different intrusion,we use Matlab to simulator and analyse its characteristic,extract the characteristics of various intrusive signal and establish the data model.We design the alarm host module,when the invasion occurred,according to the settings,the alarm host system send alarm signal or not to help security personnel to make decisions.