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File Name: Automatic TMA calculator v0.4 (metric system) (28.9 KB) Download
Author: ljqcn101 (Uploaded by ljqcn101)
Date Added: 04-02-2019
Downloads: 124
Grade: Not Rated
Description
A convenient input console for Automatic Target Motion Analysis, designed for Wolfpack or other uboat games since it's using metric system.

Dependency (usually already installed if you play other games):
Visual C++ Redistributable for Visual Studio 2015 x86 and x64

Dedicated thread: http://www.subsim.com/radioroom/showthread.php?t=240508


The calculator enables you to determine target course/speed/range passively without the need to visually identify the target.

The calculator takes those inputs into account:
1. time
2. ownship heading
3. target relative bearing
4. true bearing from ownship last observation position to current position
5. straight distance from ownship last observation position to current position

And it will immediately output all possible solutions each time. It will also display probabilities of positional/course/speed error within a certain threshold, assuming a random inaccuracy of bearing input within a range of -0.5 to 0.5 deg. The probability is computed over 1000 iterations.

The TMA solution depends on how you maneuver your boat in relative to the target, and also target's bearing rate. You can refine it to only one optimal solution by either changing speed or changing direction.
Images
Automatic TMA calculator v0.4 (metric system) by ljqcn101 on 04-14-2019
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Comments
tigersclaw11
04-16-2019 at 09:46 PM
So how do input ownship speeds?
tigersclaw11
04-16-2019 at 10:02 PM
ownship straight direction pointing from last position? could you explain that one a little?, i'm having trouble deciding what i input for that. isn't it the same as the previous heading?
ljqcn101
04-17-2019 at 09:57 PM
It does not use speed as input since you are allowed to change speed on the move. You cannot get a single optimal solution when your speed or course is not changing at least for once.
ljqcn101
04-17-2019 at 10:00 PM
When you draw a line from your last position to the current position on the map, ownship straight direction pointing from last position is the true bearing of this line. This does not equals to your heading of you just turned out boat, since it has turning radius.
ljqcn101
04-17-2019 at 10:06 PM
#fix for typo:

When you draw a line from your last position to the current position on the map, "ownship straight direction pointing from last position" is the true bearing of this line. This does not equals to your heading if you just turned your boat, since it has turning radius.
tigersclaw11
04-22-2019 at 07:24 AM
Thanks for your explanation! appreciated!
Anatov59
05-08-2019 at 10:27 AM
I teach Passive Acoustic Towed Array Operations. We have done away with manual TMA i.e.: (time frequency plot, time bearing plot & strip plot). I need to find something we can use that gives us a quick assessment of target location, course & speed). Can you provide a more detailed breakdown of the required inputs?



keithf
05-08-2019 at 01:39 PM
Sorry shipmate. My Norton anti-virus says the app is 'Not Safe' and will not install it?

ljqcn101
05-09-2019 at 03:08 AM
Hi keithf, I'm not sure how a C++ console only containing math operations can be 'Not Safe'. If you're uncomfortable you can try submitting the file manually to Norton and see their response.

Also this software open-sourced and you can check the code. Thanks!
ljqcn101
05-09-2019 at 03:30 AM
Hi Anatov59, you can check the dedicated thread in the above description section to see detailed formulas/equations. It basically uses ownship location, target bearing and time as input.
ljqcn101
05-09-2019 at 03:44 AM
For a graphical interface you can also try this program: http://www.adammil.net/Maneubo/

And his implementation breakdown: http://www.adammil.net/blog/v103_Per..._Analysis.html


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