Wavelet filtering of sodar signals

Details Wavelet filtering of sodar signals Wavelet filtering of sodar signals

1999-07-01

2000-08-01

Lobo, Ian J.

Communications, electrical: acoustic wave systems and devices

Echo systems

Distance or direction finding

367 87, 367901, 342 26, 342159, 342192, G01S 1500, G01S 1300

Patent

active

060976691

ABSTRACT:
A method for determining Doppler shifts and reflectivity data based on wavelet based sodars. Initially, a high powered sodar pulse of sound is transmitted from an antenna into the atmosphere. This pulse of sound consists of a string of concatenated wavelets. The reflected portion of this transmitted pulse is received, amplified and digitized as a string of samples of time correspond to the range of transmission. After sampling for a short time interval to cover the maximum range of sound, the sampled time series is divided into range gates. For Doppler shifts the power spectrum of the sampled time series is calculated and a peak surrounding the frequency of the transmitted sound is observed. From this peak the direction and velocity of the atmosphere at a given attitude is derived. To accurately arrive at a better velocity resolution, replication is used with wavelet coefficients and an inverse wavelet transform.

REFERENCES:
patent: 3710381 (1973-01-01), King et al.
patent: 4290066 (1981-09-01), Butler
patent: 5481269 (1996-01-01), Imhoff et al.
patent: 5481270 (1996-01-01), Urkowitz et al.
patent: 5592171 (1997-01-01), Jordan
NOAA Advanced Real--Time , NOAA Technical Memorandum ERL, ETL-251 by D.W. Gregg and S.W. Abbott, Apr. 1995.
Removing Ground and Intermittent Clutter Contamination from Wind Profiler Signals Using Wavelet Transforms by J.R. Jordan and Richard J. Lataitis, Mar. vol. 14, Journal of Atmospheric And Oceanic Technology, 1280-1297.

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