关于手机屏蔽系统的研究.docVIP

摘 要 人们在享受手机带来方便的同时，也在受到其带来的不利影响。在大学的课堂、图书馆、会议室等需要安静的地方, 经常受到手机来电响铃的骚扰；在考场等特殊场合，需要避免用手机通过移动通信网络泄密、实施破坏的事件发生；在医院等有精密仪器的场合，手机的无线信号则会产生信号的干扰，给人们的生命财产安全带来极大的隐患。这时，就应当利用无线干扰的方式来局部破坏这些指定地点的通信。本文分析了全球移动通信系统GSM和第三代数字移动通信3G的通信建立的过程以及通信的频率，并且详细研究了手机屏蔽系统工作原理。当使用场所内有移动电话处于呼入或呼出状态时, 屏蔽器内部通过锯齿波发生器来控制压控振荡器输出频率，再通过射频功率发生器发射大功率信号，切断移动电话与基站的信号连接, 阻止移动电话与外界的通信。从而切断移动电话与移动通讯基站之间的信号联系，遮断手机与基站间广播波段的正常工作，在特定的地方或区域形成“安静区”，从而对非法使用无线电设备进行管制。所以，此项研究具有良好的应用前景和重大的社会意义[1]。 关键字 手机信号屏蔽器 锯齿波 VCO 功率放大器 Abstract Nowadays people enjoy the convenience of mobile phone,but at the same time it is also affected by its adverse effects. In the University classroom, a library, a conference room, quiet place, often harassed by the cell phone call rings; in the examination room, and other special occasions, you need to avoid leak through mobile communication network using a mobile phone, event implementing damage occurs; in hospitals and other precision instruments, mobile wireless signals can cause signal interference, brings great risks to peoples life and property safety. At this point, you should take advantage of wireless interference these specify location of local failure of the mode of communication. This paper analyzes the global system for mobile communications GSM digital mobile communication of the third generation of 3G and frequency of communication process as well as the establishment of communication and detailed study of the cell phone shielding system works. When you use the site when a mobile phone is incoming or outgoing, shielded by sawtooth wave generator that controls the VCO output frequency, radio frequency power generators transmitting power signals through, cut off the signal connections of the mobile phone and the base station, block mobile phone communications with the outside world. So as to cut off the signal link between mobile phones and mobile communication base stations, interrupting normal radio bands between the handset and base station, in the formation of s