FFG Towed Sonar Qustion

jimfelt · 03-11-06, 10:57 PM

Hello. I'm confused on the FFG towed sonar, and how to figure a contacts true berring. I'v read the manual, but still don't get it. I know you have to track it, then turn the ship, and use the resolve, (star,port) but I end up with more contact lines on the nav map than before. Any help would be great. Thanks, Jim.

PeriscopeDepth · 03-11-06, 11:18 PM

Good to see so many new players.

Resolving bearing ambiguity is simple once you grasp the concept. The way the signal is processed, the TA can't tell which side the signal is coming from. So you have to resolve the bearing ambiguity.

So let's say you have a contact and you turn left to resolve. If the contact moves up the waterfall display it is on the portside. You can tell this because the contact is moving UP the waterfall display and therefore you must be turning towards it. If it were to move down, then you would be turning away from it and it would be on your starboard side.

Did that do it?

PD

Henson · 03-11-06, 11:59 PM

^^^^ What he said.

To visualize this, draw a birds-eye view. Imagine you have a contact that is at either 030 or 330. If you turn left, one will be further forward than it was on your original course, and one will be further aft. Hence, if he draws up the array, you turned towards.

Fandango · 03-13-06, 04:00 PM

Easier way: assign a Tracker to the contact and you'll see two specular contacts on the NAV map. Manouvre and look at the LOBs on the NAV map: the one moving (clockwise or anticlockwise) is the WRONG contact...

goldorak · 03-13-06, 08:37 PM

Quote:

Originally Posted by PeriscopeDepth

Good to see so many new players.

Resolving bearing ambiguity is simple once you grasp the concept. The way the signal is processed, the TA can't tell which side the signal is coming from. So you have to resolve the bearing ambiguity.

So let's say you have a contact and you turn left to resolve. If the contact moves up the waterfall display it is on the portside. You can tell this because the contact is moving UP the waterfall display and therefore you must be turning towards it. If it were to move down, then you would be turning away from it and it would be on your starboard side.

Did that do it?

PD

Thank you very much, that was one of the most simple explanations of the ffg towed array sonar I've read.

The manual isn't very clear on this point.

MaHuJa · 03-14-06, 02:17 PM

See this training mission:

http://www.orionwarrior.com/forum/sh...9312#post19312

Best used in multistation with an instructor.

03-11-06, 10:57 PM	#1
jimfelt Swabbie Join Date: Aug 2004 Posts: 6 Downloads: 285 Uploads: 0	FFG Towed Sonar Qustion Hello. I'm confused on the FFG towed sonar, and how to figure a contacts true berring. I'v read the manual, but still don't get it. I know you have to track it, then turn the ship, and use the resolve, (star,port) but I end up with more contact lines on the nav map than before. Any help would be great. Thanks, Jim. __________________ James D. Felt

03-13-06, 04:00 PM	#4
Fandango Officer Join Date: Sep 2001 Location: Trieste, Italy Posts: 236 Downloads: 0 Uploads: 0	Easier way: assign a Tracker to the contact and you'll see two specular contacts on the NAV map. Manouvre and look at the LOBs on the NAV map: the one moving (clockwise or anticlockwise) is the WRONG contact... __________________ The true worth of a man is to be measured by the objects he pursues. - Marcus Aurelius

03-14-06, 02:17 PM	#6
MaHuJa Sonar Guy Join Date: Jan 2002 Location: 59.96156N 11.02255E Posts: 385 Downloads: 3 Uploads: 0	See this training mission: http://www.orionwarrior.com/forum/sh...9312#post19312 Best used in multistation with an instructor. __________________ Teaching DW newbies how to climb the food chain.

03-11-06, 11:18 PM	#2
PeriscopeDepth Sea Lord Join Date: Jul 2002 Location: Pacific NW Posts: 1,894 Downloads: 6 Uploads: 0	Good to see so many new players. Resolving bearing ambiguity is simple once you grasp the concept. The way the signal is processed, the TA can't tell which side the signal is coming from. So you have to resolve the bearing ambiguity. So let's say you have a contact and you turn left to resolve. If the contact moves up the waterfall display it is on the portside. You can tell this because the contact is moving UP the waterfall display and therefore you must be turning towards it. If it were to move down, then you would be turning away from it and it would be on your starboard side. Did that do it? PD

03-11-06, 11:59 PM	#3
Henson Planesman Join Date: Feb 2006 Posts: 185 Downloads: 13 Uploads: 0	^^^^ What he said. To visualize this, draw a birds-eye view. Imagine you have a contact that is at either 030 or 330. If you turn left, one will be further forward than it was on your original course, and one will be further aft. Hence, if he draws up the array, you turned towards.