4．2．1 Empirical Researches on the Physical Characteristics of Shallow Water Acoustic Channels
4．2．2 Development of Underwater Acoustic Telecontrol Instruction Communication Employed in the Underwater Acoustic Releaser
4．3 Development of Advanced FH-SS System Digital Multimedia Underwater Acoustic Communication Equipments
4．3．1 Expected Target
4．3．2 Chiefly Key Techniques
4．3．3 Experimental Explorations Jor Advanced FH System Digital Underwater Acoustic Data Communication Prototype
4．3．4 Analyses of Feasibility Extending the Prototype to Underwater Acoustic Multimedia Communications
4．4 Explorations Developing Innovative APNFM System Digital Underwater Acoustic Communication Equipments
4．4．1 Outline of the Overall Structure and Operating Processes Jor the APNFM System
4．4．2 Experimental Explorations of lnnovative APNFM System Digital Underwater Acoustic Communication Equipments

Appendix
Ultrasonic Sensing Systems in the Air Medium

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