# Pink

> A 6 kHz, 14 km channel recorded off Kochi Prefecture, Japan in 2022, covering flat, up-slope, and down-slope bathymetry with a 24-element vertical array.

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LLMS index: [llms.txt](/llms.txt)

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* Experiment:
  * Location: Off the coast of Kochi Prefecture
  * Date recorded: July 2022
  * Center frequency: f<sub>c</sub> = 6 kHz
  * Bandwidth: B = 4 kHz
  * Symbol rate: R = 4 ksym/s
  * Distance: d = 14 km
  * Tx/Rx depth: d<sub>T</sub>/d<sub>R</sub> = 176 m/146 m
  * Water depth d<sub>w</sub>: varying; the data cover down-slope, up-slope, and flat bathymetry, with a water depth of 200 m in the flat case
  * Mobility: moored
  * Receiving array: vertical, M = 24 elements at most, in six hydrophone groups. Within each group, the inter-element spacing is &#8467; = 0.9 m; the distance between groups is 1.8 m.
* Parameters:
  * Sampling rate in delay: f<sub>s</sub> = 2R
  * Total delay coverage: up to 210 ms
  * Sampling rate in time: R/100 for the channel response, 2R for the phase/delay
  * Total time coverage: 55 seconds

> [!PRIMARY] 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.