SUBSIM Radio Room Forums - View Single Post

Gaspode · 04-12-07, 10:17 AM

I use the following method to determine target speed when a target is close enough and the aob is nearly 90°:

1. Determine target range
2. Note target bearing
3. Wait 3 * range/100 seconds
4. Calculate bearing change, which is the target's speed
5. If aob in the previous step differed from 90 by about 20 degrees, add 10%
6. If my range was in meters, multiply by 1.1

If bearing change was far under 10 degrees and the aob is still 90 or less, I wait another 3 * range/100 seconds, then continue with step 4 and as step 7, I divide the calculated speed by 2.

That's the simplest method I can think of when I want a good speed estimation.

I have described this method accurately in a different thread previously, even for general aobs. Unfortunately, that post has become a bit lengthy...

http://www.subsim.com/radioroom/show...=108454&page=3

04-12-07, 10:17 AM	#7
Gaspode Nub Join Date: Apr 2007 Location: Germany Posts: 3 Downloads: 0 Uploads: 0	I use the following method to determine target speed when a target is close enough and the aob is nearly 90°: 1. Determine target range 2. Note target bearing 3. Wait 3 * range/100 seconds 4. Calculate bearing change, which is the target's speed 5. If aob in the previous step differed from 90 by about 20 degrees, add 10% 6. If my range was in meters, multiply by 1.1 If bearing change was far under 10 degrees and the aob is still 90 or less, I wait another 3 * range/100 seconds, then continue with step 4 and as step 7, I divide the calculated speed by 2. That's the simplest method I can think of when I want a good speed estimation. I have described this method accurately in a different thread previously, even for general aobs. Unfortunately, that post has become a bit lengthy... http://www.subsim.com/radioroom/show...=108454&page=3