Sodar sounding of the lower atmosphere

Details Sodar sounding of the lower atmosphere Sodar sounding of the lower atmosphere

2007-02-20

2007-02-20

Lefkowitz, Edward (Department: 2855)

Measuring and testing

Volume or rate of flow

By measuring vibrations or acoustic energy

C367S087000

Reexamination Certificate

active

10547117

ABSTRACT:
A method and system for acoustically sounding the lower atmosphere involves the transmitting of an acoustic chirp and the processing of returned echoes and interference using wavelet and matched filter techniques. A single transmitter and four receivers may be used, with receivers located equidistant from the transmitter on the cardinal points of the compass. N, S, E, & W inputs are digitized and input to a wavelet filter (50) together with the transmitter chip signal (R or D) for the attenuation of the direct signal and ambient noise signals. The interference-attenuated signals are then processed in a matched filter (52) to extract phase and amplitude outputs (54and56), the phase output being unwrapped (70). The N and S phase signals and the E and W phase signals are then separately differenced (74and80) and the results used to compute (86and92) wind speed and bearing. Extracted amplitude signals (56) are put through a second wavelet filter (58) to remove echo clutter before being stored, along with the wind speed and bearing data in a range gate (96).

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patent: WO 94/10583 (1994-05-01), None
patent: WO 01/67132 (2001-09-01), None

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