Gianni,
Have you investigated the paradigm [1] involved using the VSIP (vector sound-intensity probe)? It uses the tetrahedron and yields azimuth and pitch to the source.
Ken Ekstrom Research Associate MIT Sea Grant 617 258 6302
[1] R. Hickling and W. Wei 1995. "Use of pitch-azimuth plots in determining the direction of a noise source in water with a vector sound-intensity probe" , J. Acoustic Soc. Am. 97(2), 856-866.
At 05:47 PM 4/18/2005 -0400, Gianni Pavan wrote:
I'm working on wideband multichannel recordings made with 4 hydrophones mounted on a 3D structure; something similar to a tetrahedron, with 3 hydrophones mounted on an horizontal plane and the fourth higher then the other 3. The spacing among the phones is roughly 2 meters.
I'm searching an algorithm to calculate the direction (bearing and elevation) of an acoustic source given the time delays I measure among the four hydrophones and their 3D coordinates.
Any hint will be much appreciated!
Gianni -------------------------------------------------------------- Gianni Pavan Email [EMAIL PROTECTED] Centro Interdisciplinare di Bioacustica e Ricerche Ambientali Universita' degli Studi di Pavia Via Taramelli 24, 27100 PAVIA, ITALIA Tel +39-0382-987874 Fax +39-02-700-32921 Web http://www.unipv.it/cibra
