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twm47099 · 02-23-13, 01:25 PM

With the SEAWOLF there are a few ways to get range.

If short enough range and you can detect the target in broadband, the WAA range is usually pretty good.

If I can track with the bow sphere, I will triangulate with the towed array. If your heading is right and the water deep enough so you can have a long scope on the TA, the lines from each should cross at approx the target location.

If I can't track with the bow array, I will slow down and launch a UUV. Then I will triangulate with the TA. The UUV is slow (5kts), but you can change it's heading in the torpedo control station to give a reasonable intersection angle. If the bow, UUv, and TA bearings all intersect near one point, that's a pretty good position & range.

I will also merge two tracks for the same target in the TAA station, for example UUV and TA. Then the TAA ruler can be used by putting the reference marks on the intersections (works best before the TAA screen has so many lines that its hard to separate the individual intersections.) The correct solution has the dots from both sensors taken at the same time merging together on the center line.

If you know the target's speed from the Demon station, that helps with TAA.

When I use a triangulation method, I will usually mark the intersection with a manual solution and put the values from the TAA screen for range, speed & course to its TAA track, because if I set a solution in the TAA, the intersecting bearing lines on the NAV chart are replaced with just the solution, and you can't follow the target with the intersecting lines anymore without dropping the solution.

If you can raise the periscope, if range is short enough, and you have a good ID on the target, you can get a good range from the scope. But to get a solution you will need at least 2 good observations and fit the line in the TAA. Once you have a visual solution, if you take another observation (bearing & range - AOB doesn't appear to have much effect) and mark it, the visual solution on the NAV map will have zero speed until you get another TAA solution.

Tom

02-23-13, 01:25 PM	#5
twm47099 Bosun Join Date: Apr 2012 Posts: 67 Downloads: 93 Uploads: 0	With the SEAWOLF there are a few ways to get range. If short enough range and you can detect the target in broadband, the WAA range is usually pretty good. If I can track with the bow sphere, I will triangulate with the towed array. If your heading is right and the water deep enough so you can have a long scope on the TA, the lines from each should cross at approx the target location. If I can't track with the bow array, I will slow down and launch a UUV. Then I will triangulate with the TA. The UUV is slow (5kts), but you can change it's heading in the torpedo control station to give a reasonable intersection angle. If the bow, UUv, and TA bearings all intersect near one point, that's a pretty good position & range. I will also merge two tracks for the same target in the TAA station, for example UUV and TA. Then the TAA ruler can be used by putting the reference marks on the intersections (works best before the TAA screen has so many lines that its hard to separate the individual intersections.) The correct solution has the dots from both sensors taken at the same time merging together on the center line. If you know the target's speed from the Demon station, that helps with TAA. When I use a triangulation method, I will usually mark the intersection with a manual solution and put the values from the TAA screen for range, speed & course to its TAA track, because if I set a solution in the TAA, the intersecting bearing lines on the NAV chart are replaced with just the solution, and you can't follow the target with the intersecting lines anymore without dropping the solution. If you can raise the periscope, if range is short enough, and you have a good ID on the target, you can get a good range from the scope. But to get a solution you will need at least 2 good observations and fit the line in the TAA. Once you have a visual solution, if you take another observation (bearing & range - AOB doesn't appear to have much effect) and mark it, the visual solution on the NAV map will have zero speed until you get another TAA solution. Tom