Research On Auxiliary Warning System Of Active Infrared Invasion Sentinel

China has a long sea boundary line and border line,and many border outposts are built on the mountains and islands.The living environment is very bad.On sentry duty,it is difficult to make a timely response to the situation from behind,and at night,due to the limitation of the visual field,the vigilance capability is minimized.In the rain,snow,fog,haze and other bad weather,the sentry's duty status and vigilance ability will be greatly affected.In this paper,the principle of active infrared detection based on the design of a portable auxiliary warning system,this system is easy to use and flexible deployment,can achieve rapid deployment,the ability to quickly form a wide range of warning area.The main work of this thesis is as follows:First of all,according to our country in remote areas sentinel work environment,because of its geographical position remote,remote,laying fixed line has great difficulty,which presents an active infrared intrusion detection warning system of portable auxiliary,breaking the traditional active infrared intrusion detectors can only be fixed deployment limitations.Second,the effects of different kinds of infrared emission modes on the infrared detection efficiency were studied,and the emission mode of the pulse was selected to make the infrared detection extremely efficient.Third,depth analysis of the rain,snow,fog,haze and other bad weather on the impact of infrared detectors for rain,snow and other atmospheric atmosphere containing larger diameter aerosol particles,the use of infrared light signal encoding to increase the way infrared Detection of reliability.Fourth,the fog and haze in the atmosphere with a smaller diameter of aerosol particles with transmission of infrared light absorption and scattering effect,through the analysis of the formula of pulse duty to improve and improve the pulse transmission power conclusion pulse peak current ratio can be changed.Therefore,we design an adaptive circuit which can adjust duty cycle.Fifth,based on the portable system using battery-powered,so in a certain amount of electricity,how to reduce system power consumption,improve system use time is the key.By analyzing the influence of sunny weather and rain,snow,fog,haze and other weather aerosol particles on the infrared light transmission and the change of its own ambient light,an adaptive system can be designed to control the coding according to the change of light.Sixth,according to the working principle and demand of the system,the FPGA is used as the core control single chip,and the coordination and control of the whole system are achieved through the preparation of the software part.Seventh,n the laboratory through the hardware and software on the entire system of the various parts of the experiment and testing in the system modules and can work properly after the test prototype,in the real situation of the entire system experiments and testing.