April 1995	VOLUME 20	NUMBER 2	IJOEDY	(ISSN 0364-9059)

NONTECHNICAL CONTENT
		Front cover and table of contents
		Back cover
EDITORIAL
William M. Carey		Editorial: Standard definitions for sound levels in the ocean		109
PAPERS
P. Anders Rosenqvist		Passive Doppler-bearing tracking using a pseudo-linear estimator		114
Oommen George and Rajendar Bahl		Simulation of backscattering of high frequency sound from complex objects and sand sea-bottom		119
David O. Walsh and Pamela A. Delaney		Detection of transient signals in multipath environments		131
COMMUNICATIONS
K. Hickey, R. H. Khan, and J. Walsh		Parametric estimation of ocean surface currents with HF radar		139
M. I. Latz, J. Rohr, and J. Hoyt		A novel flow visualization technique using bioluminescent marine plankton--PartI: Laboratory studies		144
J. Rohr, M. I. Latz, E. Hendricks, and J. C. Nauen		A novel flow visualization technique using bioluminescent marine plankton--Part II: Field studies		147