AOB Calculations

chrisp · 07-26-07, 12:05 PM

Been foolin, around with manual targeting in 1.3 and noticed that when I got the speed estimate, I also get a course estimate.

So fooled around more and came up with what I think is a quick way to calculate AOB:

Get the absolute bearing heading:

Sub Course + Bearing

If value greater then 360, subtract 360.

Get te absolute value of the Bearing heading - Target heading.

If the number is greater than 180, subtract 180.

Now, you might have to figure out whether the result or its complement is that actual AOB (not hard to do). I've done a lot of fiddling with protractors and it appears to work and it's really quick.

Example 1:

You're heading 30 degrees and pick up a target bearing 310 degrees. Target course appears to be 80 degrees true.

(30 + 310) = 340

|340 - 80| = 260
subtract 180 --> 80

The AOB will be either 80 or 120 (180 - 80). Since we are ahead of the target, it's 80.

Example 2:

Sub course = 60, target bearing = 319, target course = 100

(60 + 319) = 379
subtract 360 for 19

|19 - 100| = 81

AOB is either 81 or 99. We're behind the target -- it's 99.

Quick, simple, and appears to work. Can be done really easily with a calculator.

I think.

07-26-07, 12:05 PM	#1
chrisp Watch Join Date: Sep 2002 Posts: 16 Downloads: 15 Uploads: 0	AOB Calculations Been foolin, around with manual targeting in 1.3 and noticed that when I got the speed estimate, I also get a course estimate. So fooled around more and came up with what I think is a quick way to calculate AOB: Get the absolute bearing heading: Sub Course + Bearing If value greater then 360, subtract 360. Get te absolute value of the Bearing heading - Target heading. If the number is greater than 180, subtract 180. Now, you might have to figure out whether the result or its complement is that actual AOB (not hard to do). I've done a lot of fiddling with protractors and it appears to work and it's really quick. Example 1: You're heading 30 degrees and pick up a target bearing 310 degrees. Target course appears to be 80 degrees true. (30 + 310) = 340 \|340 - 80\| = 260 subtract 180 --> 80 The AOB will be either 80 or 120 (180 - 80). Since we are ahead of the target, it's 80. Example 2: Sub course = 60, target bearing = 319, target course = 100 (60 + 319) = 379 subtract 360 for 19 \|19 - 100\| = 81 AOB is either 81 or 99. We're behind the target -- it's 99. Quick, simple, and appears to work. Can be done really easily with a calculator. I think.