| Based on in-depth analysis into the mechanism of mobile communication, this paper tries to find some effective methods to prevent information leakage and interception, resorting to the technology of electromagnetic transmission suppression. This paper defines concrete shield areas, looks into possible implementation plans for the MP signal shielding system. Based on related theories and network control technology, this paper designs an intelligence shielding system of network control, which aims at control and optimize the shielding scope and effects.Firstly, after taking some preliminary calculation based on related theories of mobile communication, this paper makes some field investigation and measuring, so as to determine the installation plan, quantities and technical parameters for the shielding equipments. Composed of control computer, wireless/485 Receiving-Sending device, and shielding device controlled by the single chip microcomputer and 485 bus. This system is intended to combine wireless and wired control methods.Secondly, this paper introduces and analyzes the MP shielding device and how to select antenna, establishes the Modbus-based communication protocol between the main computer and MP signal shielding control computer, develops the intelligence control module for the signal shielding device based on the mechanism of 8051 single chip microcomputer, describes central and periphery circuits of the main unit, communication portal, watchdog. Besides, this paper successfully designs terminal control program based on imbedded C51.At the same time, based on the MFC programming using Visual C++, this paper also designs the multi-process communication control program for the information transmission system, as well as the driver software for the windows system. The central control software can control and monitor equipments'operation, receive directions and make effective response. The control methods include client management, unit control, team control, general control, all of which can be combined in use. The control interface provides a tree-shaped menu, realizing the function of electronic vector map.Finally, this project is applied to a prison living quarters and meet all technical and practical requirements, accomplishing effective management of MP signal in the prison. There is till room for further improvement on the control software, and the flexibility of IP network integration need further elaboration. |
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