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On 4/16/02 11:39 AM, "Herbert Prinz"  wrote:

> Steven,
>
> Could  you please explain to us why the size of the confidence ellipse would
> depend in part on the angles that the three LOPs cross at?

I was wrong.

After playing with my program a little I see that the size can actually get
smaller with acute angles, provided that the intercepts (in the navigation
sense) are similar.  It can also get larger if the intercepts are (somewhat)
different.

Here are three examples.

1. azimuths: 0, 60,120, intercepts: -2, 5, -1
2. azimuths: 0, 110,120 ints: same
3. azimuths: 110, 60, 120  ints: same

Note that two lines are the same in all plots.

In #2 the error in the NE-SW direction increases, but is a little less in
the NW-SE direction.

In #3 error is reduced in all directions.

Steve Tripp

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