A Method on Underwater Extremely Low Frequency Atmospheric Noise

Shi Min Feng; Sui Hua Zhou; Hong Xin Zhang

doi:10.4028/www.scientific.net/AMM.333-335.2457

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HomeApplied Mechanics and MaterialsApplied Mechanics and Materials Vols. 333-335A Method on Underwater Extremely Low Frequency...

A Method on Underwater Extremely Low Frequency Atmospheric Noise

Abstract:

On the basis of low-pass characteristic of the ocean in extremely low frequency (ELF) band , which makes the atmospheric noise distort and signal to noise (SNR) of the receiver worse, magnitude-frequency and phase frequency characteristic of the ocean in ELF band were researched. Influence at different depth of the ocean on the atmospheric noise was simulated and frequency compensation filter was designed with the best uniform approximation method to compensate the distorted atmospheric noise. With the sampling frequency fs=1KHz, at 30m~200m depth, no more than 9th-order IIR filter was used to design frequency compensation filter. The maximal error of the magnitude-frequency characteristic of the designed frequency compensation filter is less than 0.5dB compared with the theoretical. With the filter, the sharpness of the ELF atmospheric noise spikes are restored and the SNR of the receiver is improved.

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Periodical:

Applied Mechanics and Materials (Volumes 333-335)

Pages:

2457-2460

DOI:

https://doi.org/10.4028/www.scientific.net/AMM.333-335.2457

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Online since:

July 2013

Authors:

Shi Min Feng, Sui Hua Zhou, Hong Xin Zhang

Keywords:

Atmospheric Noise, Best Uniform Approximation Method, ELF, Frequency Compensation Filter

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