A kind of passive and active anti-tracking attack alarm system is described to achieve monitoring whether someone are tracking or attacking

issue a whistle warning and send positioning alarm information and other functions. The system uses Arduino DUE as microprocessor control system

pyroelectric infrared sensor as front sensing unit

GPS module and GSM/GPRS module as positioning and communication module. Overall design of program is introduced

and design of system module is expatiated

which includes hardware design and software algorithm

and test results is given. After several experiments

the system is responsive

it has strong antiinterference ability

safe and reliable

at the same time

it is easy to carry.