A direct method for measuring acoustic ground impedance in long-range propagation experiments.
A method is reported for determining ground impedance in long-range propagation experiments by using the definition of impedance directly. The method is envisioned as way of measuring the impedence at multiple locations along the propagation path, using the signals broadcast during the experiment itself. In a short-range (10 m) test, the direct method was in good agreement with a more conventional model-based least-squares method. The utility of the direct method was demonstrated in a 400 m propagation experiment in a agricultural field. The resulting impedance was consistent with the impedance measured previously in the same field.
National Center for Physical Acoustics, University of Mississippi, University, Mississippi 38677, USA. jso@olemiss.edu
Jin H
JH
Soh
Kenneth E
KE
Gilbert
W M Garth
WM
Frazier
Carrick L
CL
Talmadge
Roger
R
Waxler
D000162:Acoustics; D000383:Agriculture; D017097:Electric Impedance; D016018:Least-Squares Analysis; D008962:Models, Theoretical; D012987:Soil; D014887:Weather; D014919:Wind
D012987:Soil