7
votes
Accepted
Minimum hydrophone spacing for low frequency bearing estimation
Great question, but it partly depends on what you mean by 'good'.
20 - 200Hz calls have wavelengths between 75 and 7.5m. With appropriate algorithms, it is possible to measure time delays to ...
- 2,091
4
votes
Minimum hydrophone spacing for low frequency bearing estimation
As you talk about direction and not localization, I assume that you mean a vertical triangular array.
Well, it depends.
It depends on the signal to noise ratio (SNR) and on the type of call.
pulse-...
- 7,630
4
votes
Bearings on PAMGuard
For a problem like this, you may be better off contacting PAMGuard support: [email protected], ideally uploading a small sample of data and we'll take a look.
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2
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How to synchronize two independent soundtraps working as part of the same hydrophone array?
Malinka et al (2020) published a relevant paper describing a synchonization cable to clock-sync seven ST300's on a vertical string, so it's certainly possible, though custom firmware (support from ...
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2
votes
What is the bearing's reference point in PAMguard
It is not a silly question, but gives me the possibility to discuss the process of direction finding with 2 hydrophones.
The direction to the source is estimated using the time delay between the sound ...
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1
vote
How to parametrize PAMGuard to avoid great bearing inaccuracies all along a recording
Perhaps you could share a screen grab of one of the waveforms of a click that get's a poor bearing. That will show if there is multipath, or some other 'good' reason as to why the cross correlation of ...
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