Index for 4aSAa

• 4aSAa1. Mundane issues in active classification for naval purposes.
• 4aSAa2. An architecture for wave interaction with complex environments.
• 4aSAa3. Active classification of submerged structures by means of wave packet decomposition.
• 4aSAa4. Techniques for active classification of underwater structures.
• 4aSAa5. Broadband mine detection and classification---Target responses from a set of 2- to 20-kHz shallow-water experiments.