A System To Respond To Complex Electromagnetic Environment Protection Technology

With the development of integrate system,a variety of information electricequipment,it will result in system complexity for command,communication,control,computer, reconnaissance,surveillance,so the electromagnetic interference is inevitableproduced,then lead to the problem of electromagnetic compatibility. Especially the highsensitivity of the antenna-connected receiver, the complicated characteristics ofinterfering signal(such as a variety of modulation, complex change for fastfrequency),the system of electromagnetic compatibility will be destroy.To solve the complicated case,first of all,the system is analysed forantenna-connected receiver,for example,the system interfering signal disturb theantenna for ultra-high frequency and global position system.To antenna for ultra-highfrequency,it is described from electric fields.(for instance,the orientation ofantenna,induce currents into metal surface, transmission parameters, and so on.);theinterference of harmonic signal,the characteristic of transmission,and so on,which arepresented from electric circuit.Secondly,the arrangement is described for equipment and cables.the theperformance of degradation or malfunction for other equipment due to case and cableconducted and radiation,when the interfering signal transmit from the enclosure ofequipment and interface.If the cables arrange unresonably which the high level signaltransmit by,which can disturb other cables and equipment by inducing or capacitivecoupling,the performance of system degrade in the end.Finally,the protection of system is designed by filtering(including power supplyfiltering and signal filtering),shielding,the circuit of interface,electrical bonding andgrounding.the shielding include electric field,magnetic field,and electromagneticfield;the arrangement of interface circuit, general RS232,local area network,universalserial bus are discussed in the design of interface circuit;the cables,enclosures,vehicle isparticularly required in electrical bonding and grounding.The electromagnetic compatibility of system achieve by analyzing anddesigning,the method is useful in the similar system for electromagnetic compatibility.