Study On Integrity Protection Techniques Against Strong Interference For Front End Of Electronic Information System

With the development of strong radiation technology using in the fields like electromagnetic and laser,electronic information systems are facing the urgent need of strong interference suppression and protection.External interference can cause complex effects in electronic information systems: when the intensity of interference is relatively low,the systems could suffer from signal-to-noise ratio decrease or bit error rate increase;when the intensity reaches a certain level,the front-end of the system could be saturated;when the intensity is large enough,such as strong electromagnetic and laser weapons,the system will be damaged within a short period.Aiming at the protection needs of front end of electronic information systems to the strong interference suppression and damage,this paper mainly analyzes the threat faced by electronic information system and focuses on the comprehensive protection of strong electromagnetic and laser interference.We propose the protection method of energy selective strong electromagnetic,study exact protection technology based on energy selective mechanism,and then develop a energy selective surface which can be used for the protection of strong electromagnetic damage in satellite navigation receiver.Meanwhile,we propose strong interference suppression method based on array signal processing technology,radio-frequency amplitudes and phases weighting,as well as experimental method of strong electromagnetic interference suppression.In addition,the protection technology of high energy laser beam using graphene material is also proposed,and tunable switching devices with graphene photonic crystal waveguides are designed.The main contents and achievements of this paper can be included as follows:The first chapter mainly analyzes the background and requirement of strong interference protection,especially the protection for strong electromagnetic attack.The development and threat of strong electromagnetic and laser weapons,the protection capability of information equipment system and the research status of protective materials and devices are also introduced.The second chapter mainly studies the protection technology based on the proposed energy selection mechanism.The principles of energy selective protection are analyzed,and the design methods of energy selective protection structures are put forward,which indicate the effectiveness of the energy selective electromagnetic protection method and the performance of the front door with excellent energy selective surface.The third chapter proposed the interference suppression methods based on arraysignal processing technology and radio-frequency amplitude-phase weighting for the strong interference,which could lead to the over-saturation of the front end of the receiver.In the fourth chapter,the anti-saturation interference experiment method is proposed,the algorithm verification of the experiment method and anti-saturation interference experiment system are developed.The experimental results show that the system can improve the anti-saturation ability of GPS receiver from 15 dB to 60 dB,and the suppression ability of narrowband strong electromagnetic interference can reach at about 90 dB.In the fifth chapter,the composite structure design methods of graphene in 2D photonic crystal system are proposed based on the adjustable conductivity of graphene with external bias voltage.A graphene optical device with switching function is then designed.Simulation results show that the working frequency band of graphene devices can be significantly changed under the electrical modulation,thus have a broad application prospect in the field of front-end protection technology to high-energy laser weapons.The sixth chapter summarizes the whole works and analyzes the key points of the follow-up research.