Channel Impulse Response Analysis and Simulation for Acoustic Modem Experiments in the Singapore Straits

A series of experiments were conducted in the Singapore Straits to test the performance of several acoustic communication waveforms and to capture time-changing Channel Impulse Responses (CIRs). The straits present a challenging shallow (20m) acoustic environment with background noise from vessels and snapping shrimp, and multipath resulting from anchored vessels, multiple small islands, and buoys in the water space. Data was collected with multiple receivers on a mooring line at fixed depths, monitored from a work boat, and a single transmitter submerged from a second work boat. Data was collected with the receivers and transmitters in static configuration, or with the transmitter drifting. A novel method for capturing the time-changing CIR over small time scales is described and the results of the experiment detailed.