April 1998	VOLUME 23	NUMBER 2	IJOEDY	(ISSN 0364-9059)

NONTECHNICAL CONTENT
		Front cover and table of contents
		Back cover
PAPERS
Michael Nicholas, Peter M. Ogden, and Fred T. Erskine		Improved empirical descriptions for acoustic surface backscatter in the ocean		81
Chang Shen and Ulrich Lemmin		Improvements in acoustic sediment concentration profiling using an LMS compensation algorithm		96
Stergios Stergiopoulos, D. R. Munn, and Nikitas Nikitakos		A method minimizing the correlation properties of a noise field and improving detection of signals embedded in anisotropic noise		105
Jason M. Goldberg		Joint direction-of-arrival and array-shape tracking for multiple moving targets		118
Yves Doisy		General motion estimation from correlation sonar		127
TECHNICAL COMMUNICATIONS
Ya-Qiu Jin		Monitoring regional sea ice of China's Bohai Sea by SSM/I scattering indexes		141