Research On Wavelet Denoising Algorithin In Ayionics Communications System Eoid FPGA Implementation

In this paper, combined with overview of the avionics data communication systemdevelopment both at home and abroad, an avionics data communication system whichintegrates the function of data acquisition, processing and transmission is designed, thedata processing of the system apply the theory of wavelet analysis.Wavelet analysis has the characteristic of localizable time and frequency andovercomes the defects of traditional fourier analysis. So it greatly expands the analysisability to signal, and is recognized as high-tech in the digital signal processing field andattracts multi-disciplinary attention, and has been widely used in many areas. Therelative theory of wavelet transform and principle of wavelet de-noising are firstintroduced in this paper, focus on the wavelet threshold de-noising algorithm based onthe hard threshold function and soft threshold function, then improved the thresholdfunction. The improved algorithm makes the SNR (Signal to Noise Ratio) increase10.251dB, promote the algorithm performance, and realize the algorithm based onFPGA structure. Followed by, the zero bias circuit and the nonlinear compensationcircuit are designed based on the LMS algorithm and the Least squares algorithm. thepaper designs the ARINC-429communication interface based on FPGA. At last, thewhole system is tested by the software and hardware debugging.