Black

A vertical, 18 kHz channel recorded over the Mariana Trench in October 2024, linking a near-surface planar array to a transmitter 8718 m below.

Experiment:
- Location: Mariana Trench
- Date recorded: October 2024
- Center frequency: f_c = 18 kHz
- Bandwidth: B = 12.5 kHz
- Symbol rate: R = 12.5 ksym/s
- Distance: d = 8.7 km (vertical)
- Tx/Rx/water depth: d_T/d_R/d_w = 8718 m/6 m/8720 m
- Mobility: moored
- Receiving array: planar, M = 8 elements arranged at the vertices of two concentric squares (outer square side 264 mm, inner square side 88 mm, so that ℓ ≥ 88 mm)
Parameters:
- Sampling rate in delay: f_s = 2R
- Total delay coverage: up to 7 ms
- Sampling rate in time: R/100 for the channel response, 2R for the phase/delay
- Total time coverage: 36 seconds

Acknowledgement

The Underwater Acoustic Channels Group gratefully acknowledges the Japan Agency for Marine-Earth Science and Technology (JAMSTEC) for their efforts in providing the data.