James C. Preisig.Also issued as Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Electrical Engineeing and Woods Hole Oceanographic Institute, 1991.Includes bibliographical references (p. 171-173).Supported by DARPA. N00014-89-J-1489 Supported by NSF. MIP 87-14969 Supported by a General Electric Foundation Graduate Fellowship in Electrical Engineering, and a National Science Foudnation Graduate Fellowship.