July 1999 VOLUME 24 NUMBER 3 IJOEDY(ISSN 0364-9059)

NONTECHNICAL CONTENT
Front cover and table of contents
Back cover

PAPERS
David Middleton New physical-statistical methods and models for clutter and reverberation: The KA-distribution and related probability structures 261
Richard O. Nielsen Cramer-Rao lower bounds for sonar broad-band modulation parameters 285
Andrea Trucco and Vittorio Murino Stochastic optimization of linear sparse arrays 291
M. D. Stokes and G. B. Deane A new optical instrument for the study of bubbles at high void fractions within breaking waves 300
Saman S. Abeysekera Investigation of nonlinear interactions in ocean swell waves using the reduced bispectrum 312
Christophe Craeye, Piotr W. Sobieski, Larry F. Bliven, and Albert Guissard Ring-waves generated by water drops impacting on water surfaces at rest 323
T. C. Yang and Kwang Yoo Internal wave spectrum in shallow water: Measurement and comparison with the Garrett-Munk model 333
David Rubenstein Observations of cnoidal internal waves and their effect on acoustic propagation in shallow water 346
Martin Musil, Michael J. Wilmut, and N. Ross Chapman A hybrid simplex genetic algorithm for estimating geoacoustic parameters using matched-field inversion 358
S. Negahdaripour, X. Xu, and L. Jin Direct estimation of motion from sea floor images for automatic station-keeping of submersible platforms 370

TECHNICAL COMMUNICATIONS
Taek Lyul Song Observability of target tracking with range-only measurements 383
Pan-Mook Lee, Seok-Won Hong, Yong-Kon Lim, Chong-Moo Lee, Bong-Hwan Jeon, and Jong-Won Park Discrete-time quasi-sliding mode control of an autonomous underwater vehicle 388
X. Yun, E. R. Bachmann, R. B. McGhee, R. H. Whalen, R. L. Roberts, R. G. Knapp, A. J. Healey, and M. J. Zyda Testing and evaluation of an integrated GPS/INS system for small AUV navigation 396