RE: Target Motion Analysis - Geometry Pkg

[John Guin]

This is a problem that would make the most sense to sailors on submarines.

Specifically, a (passive: listening only) sonar system can get a bearing to
a target.  This bearing is usually fairly accurate.  Under some conditions,
it can also get a good guess at range.  This number is much less precise.

You also know the speed and course of your submarine.

As your relative positions change over time, the task is to figure out 3
things:
1. What course the target is on?
2. How fast is it moving?
3. How far away is it?

I couldn't get the code in the other branch of this thread to work
("createLines" is not a valid command in Octave for me) so I can't comment
on the solution offered there.  But the basic problem is trying to work out
the course, speed and range of a ship that you can only hear.

John

-----Original Message-----
From: Help-octave [mailto:address@hidden
On Behalf Of Juan Pablo Carbajal
Sent: Tuesday, May 03, 2016 11:54 AM
To: Thomas D. Dean <address@hidden>
Cc: Help GNU Octave <address@hidden>
Subject: Re: Target Motion Analysis - Geometry Pkg

On Tue, May 3, 2016 at 6:33 PM, Thomas D. Dean <address@hidden>
wrote:
> On 05/03/16 02:36, Juan Pablo Carbajal wrote:
>
>> I do not understand exactly what you are trying to do, hence I can't 
>> give you precise help. I saw your code and your plot, but this really 
>> did not help to understand the problem you want to solve.
>>
>> In the difference you want to minimize (you probably want the 
>> distance between the points, not their displacement) UnkLine, if 
>> defined at the beginning, is a function  of BrgLines, so to optimize 
>> you will need to adjust BrgLines.
>> But again, maybe I just understand what you want.
>>
>
> Given the red and blue lines, how do I determine the green line?
>
> I want to solve for UnkLine, and the mean value of the blue lines was 
> an initial guess, maybe as good as any other guess.
>
> Tom Dean
>
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Given a simple example is difficult to guess what is the mathematical
meaning of the green line.
Is this a pursuit problem?

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