Research On Processing Method Of Video Electromagnetic Leakage Signal Based On Singular Spectrum Analysis

This thesis focuses on the reception and reconstruction technology of useful information in TEMPEST technology,and conducts research and analysis on computer video information leakage.By analyzing the spectrum characteristics of the intercepted video signal,aiming at the problem of large noise in the intercepted video signal,the singular spectrum analysis method is used to reduce the noise of the noisy video signal.Realize the image restoration with the intercepted video leakage signal,and verify the effectiveness of the singular spectrum analysis method applied to video signal noise reduction.Aiming at the problem of computer video electromagnetic leakage signal,a data acquisition and processing system based on Lab View is designed.The system can collect data in multiple frequency bands on existing equipment,integrate the singular spectrum analysis algorithm into the system,and implement the application of singular spectrum analysis to reduce the noise of the collected video electromagnetic signals by calling the python interface.The image restoration function is integrated into the system to realize real-time comparison of video image restoration.Through experiments,applying the singular spectrum analysis method to video electromagnetic leakage signal denoising not only removes the noise relatively cleanly,but also retains some details and features of the original video electromagnetic signal,and the signal-to-noise ratio is significantly improved.In this paper,a SSA-based video electromagnetic leakage signal processing system is designed for the collection,processing and image restoration of computer video electromagnetic leakage signals,and some problems existing in the experiment process are analyzed and researched,and solutions are proposed:1.For the problem of signal acquisition,this paper designs an electromagnetic signal acquisition and processing system based on Lab View.Design the electromagnetic leakage data interface,and integrate the functions of data and waveform acquisition and storage,important parameter input,and singular spectrum analysis and processing in the test system.2.In view of the huge number of electromagnetic leakage signals that can be used for video image restoration and the long operation time,this paper designs a method of splitting data,grouping data and recombining them,and realizes the processing of measured data under 500000 data points.3.Propose a restoration scheme for video image information.Since the data sampling clock and the pixel clock are asynchronous clocks,the two cannot have the same frequency,so the restored image has tilted distortion.In response to this phenomenon,this paper uses the data fine-tuning method to perform tilt correction on the restored image of the signal after singular spectrum analysis and processing.