About Discrimination of hydrophone sound.

OB · 11-02-05, 12:09 AM

Hi ALL :P

By a hydrophone sound How do all of you judge it?

For example

1. The vessels which approaches of sounds.
2. The vessels which goes away of sounds.
3. The Vessels directly overhead of sounds.

IS it a Reproduction Faithfully hydrophone sound ?

Trav_R · 11-02-05, 03:34 AM

I have the same question. Hopefully an SH3 hydrophone expert will be able to tell us a better method. For now, I have to plot the bearing and estimated range on the map. Then I use the compass tool to make a circle around the estimated position that signifies the error in my range estimate. If the target is very far away, I make a large circle, about 4 km or so. If it's closer, I make about a 2km circle. Once you get a few circles of estimated positions over a period of an hour or two, you have a fair idea of course and speed. Not good enough for a torpedo solution, but good enough to set up a nice intercept ahead of the target, where you can do your final TDC calculations.

Like I said, I'm with you and I'd like to know how to tell whether it's coming or going just by listening and not having to plot points.

The Avon Lady · 11-02-05, 03:47 AM

Suggested reading:

Advanced hydrophone techniques.

There is also a thread here somewhere, with a brilliant analysis of how you can detected what ship you are picking up by measuring the RPM of the boat's propellers. Someone have a link?

OB · 11-02-05, 03:57 AM

Thanks Trav_R and The Avon Lady :P

After all Will judgment only by a sound be impossible?

I come out when I judged that I read a U-boat book only by a sound, but.

11-02-05, 12:09 AM	#1
OB Mate Join Date: Aug 2005 Location: Shizuoka Japan Posts: 53 Downloads: 0 Uploads: 0	About Discrimination of hydrophone sound. Hi ALL :P By a hydrophone sound How do all of you judge it? For example 1. The vessels which approaches of sounds. 2. The vessels which goes away of sounds. 3. The Vessels directly overhead of sounds. IS it a Reproduction Faithfully hydrophone sound ?

11-02-05, 03:47 AM	#3
The Avon Lady Über Mom Join Date: May 2005 Location: Jerusalem, Israel Posts: 6,147 Downloads: 5 Uploads: 0	Suggested reading: Advanced hydrophone techniques. There is also a thread here somewhere, with a brilliant analysis of how you can detected what ship you are picking up by measuring the RPM of the boat's propellers. Someone have a link? __________________ "Victory will come to us from the wombs of our women." - Houari Boumedienne, President of Algeria, Speech before the UN, 1974

11-02-05, 03:34 AM	#2
Trav_R Ensign Join Date: Oct 2005 Location: Oklahoma, USA Posts: 227 Downloads: 0 Uploads: 0	I have the same question. Hopefully an SH3 hydrophone expert will be able to tell us a better method. For now, I have to plot the bearing and estimated range on the map. Then I use the compass tool to make a circle around the estimated position that signifies the error in my range estimate. If the target is very far away, I make a large circle, about 4 km or so. If it's closer, I make about a 2km circle. Once you get a few circles of estimated positions over a period of an hour or two, you have a fair idea of course and speed. Not good enough for a torpedo solution, but good enough to set up a nice intercept ahead of the target, where you can do your final TDC calculations. Like I said, I'm with you and I'd like to know how to tell whether it's coming or going just by listening and not having to plot points.

11-02-05, 03:57 AM	#4
OB Mate Join Date: Aug 2005 Location: Shizuoka Japan Posts: 53 Downloads: 0 Uploads: 0	Thanks Trav_R and The Avon Lady :P After all Will judgment only by a sound be impossible? I come out when I judged that I read a U-boat book only by a sound, but.