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Kalman Filter-based Short-wave-continuous Wave Noise Reduction Technology

Author: LiZhongChun
Tutor: QianZhiHong；FuXianGui
School: Jilin University
Course: Electronics and Communication Engineering
Keywords: Kalman filter Morse signal Noise Reduction Digital Signal Processing
CLC: TN917.1
Type: Master's thesis
Year: 2010
Downloads: 159
Quote: 0
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Abstract


This study is shortwave Morse telegraph signal noise suppressing process technology. In the wireless communication system, the noise signal interference is affecting the communication results. Analog communication standard, shortwave Morse telegraph communication is dependent ionospheric skywave reflection and ground wave transmission, a strong dependence on the channel, with the development of industrial electrification, shortwave channel interference by growing the Morse signal transmission The sharp deterioration in the quality of the lead radio duty Chaoshou levels declining to engage in artificial listening Collecting Morse telegraph signal telegrapher bring greater burden. The purpose of this study is the use of digital signal processing technology, on the basis of the alteration of the original radio equipment hardware structure, build online signal processing module level audio processing system as the radio, the the Morse audio signal output to the radio carried down noise after processing to enhance the signal-to-noise ratio of the audio signal in Morse, improve the sense of the Morse audio signals to listen, to improve the accuracy of the duty telegraph signal Collecting on the basis of reducing the labor intensity of the duty officer of the radio telegraph, to enhance radio duty business level. On the basis of previous research work, first of all relevant laws in Morse code point plan and character analysis, study of the Morse telegraph signal noise type, noise signals of Morse The mode of contamination, analyzed the impact of of shortwave communications equipment erected the Morse telegraph signal noise, the the telegraph Chaoshou noise state achieve the artificial noise immunity Collecting the principle. Autocorrelation characteristics according to the the Morse signal level code analysis of the human brain in memory and recognition of the Morse telegraph signal analysis process, and the in the uneven state transmitters practices, Collecting anti-noise processing method. Analysis of the morse signal noise reduction processing technology, the establishment of the state of shortwave Morse telegraph signal space model, the Kalman filter algorithm it is derived, the establishment of the Kalman filter model. Explores the Kalman filter in the shortwave Morse telegraph signal audio filtering method, Kalman Filter DSP program written in CCS environment, combined with the existing duty station audio output interface, build the core digital DSP5402 and AIC23 signal noise reduction processing module, the use of AIC23 analog-to-digital sampling of the audio signal output of the radio, the noise reduction processing using a Kalman filtering process an audio signal in Morse in DSP5402, the processed audio signal through the headphone jack output of AIC23 to the telegrapher Collecting. In order to verify the Kalman filter processing of the the Morse audio signal noise reduction processing performance, this paper simulates the period of the Morse audio signal by white Gaussian noise pollution, use the calculation method of the output signal-to-noise ratio, the Kalman filter with traditional narrowband filter for a comparison test, the experimental results show that the estimation model of the Kalman filter algorithm of the statistical properties of the system parameters and the noise determines the noise processing performance of the Kalman filter to Morse signals, the signal in Morse letter The relatively large noise, the Kalman filter can fully meet the noise reduction effect of the narrowband filter.

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CLC: > Industrial Technology > Radio electronics, telecommunications technology > Communicate > Telex, fax > Telegraph transmission theory,the telegraph network
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