Answers.Body: <p>The easiest way is to ping them with a sweep (to get good time resolution) from a fixed location with respect to the hydrophones. We normally place a weak high frequency source at one of the hydrophones and have that ping at some interval.</p>
  <p>Edit: good time resolution is obtained by matched filtering</p>
  
Answers.ContentLicense: CC BY-SA 4.0
Answers.CreationDate: 2022-07-14T07:11:25.623Z
Answers.LastActivityDate: 2022-07-15T05:13:55.073Z
Answers.LastEditDate: 2022-07-15T05:13:55.073Z
Answers.UserDisplayName: Marinebioacoustics Aarhus Univ
Body: <p>What methods are currently available to time synchronise acoustic recorders underwater automatically on a regular basis? I am looking to deploy a small 3-hydrophone triangular array of Soundtraps at roughly 2m spacing to locate baleen whales. However, the area is fairly remote so I am looking for a stand-alone solution to synchronise devices regularly while deployed. Deployment duration would be about 4-6 months.</p>
  
Comments.ContentLicense: CC BY-SA 4.0
Comments.CreationDate: 2022-07-18T07:48:20.153Z
Comments.Text: Thanks I have edited the question with species and dimension of array information.
Comments.UserDisplayName: DeniseR
Tags: <synchronization>
Title: Synchronisation of hydrophone arrays
ThreadText: # Synchronisation of hydrophone arrays
  
  (Asked by: username_0 on 2022-07-11)
  
  What methods are currently available to time synchronise acoustic recorders underwater automatically on a regular basis? I am looking to deploy a small 3-hydrophone triangular array of Soundtraps at roughly 2m spacing to locate baleen whales. However, the area is fairly remote so I am looking for a stand-alone solution to synchronise devices regularly while deployed. Deployment duration would be about 4-6 months.
  
  **Tags:** synchronization
  
  > **Comments:**
  > **username_0**: Thanks I have edited the question with species and dimension of array information.  
  
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  ## 1 answers
  
  ### Answer by username_1 on 2022-07-14. Score: 6
  
  The easiest way is to ping them with a sweep (to get good time resolution) from a fixed location with respect to the hydrophones. We normally place a weak high frequency source at one of the hydrophones and have that ping at some interval.
  
  Edit: good time resolution is obtained by matched filtering
  
  
  ---
  
  