NavList:

Ok John. Where there may be issues is when a running fix falls outside the EP's uncertainty ellipse. It could be that this doesn't happen. Some sea trials will have to be done. G

Re: Fix Maximum Probability Positions
From: John Karl
Date: 2013 Mar 26, 19:19 -0700
No Greg, as I've said, the ellipses are only to remind us of the uncertainties involved. We really don't know their exact shape, size, or probability distribution to follow your suggestion. This is an example of one the three principles of (Bayesian) estimation methods: don't assume something we don't actually know.

If we did know the details of these distributions (such as in the symmedian case for normal distributions) we could make more specific conclusions. But in the absence of this info, the point on the LOP nearest to our TR is the rational choice. This point honors the accuracy of the new LOP, while retaining our previous estimate of position parallel to that new LOP (for which the new LOP contains no information).

Good on you for following this discussion,
John
----------------------------------------------------------------
NavList message boards and member settings: www.fer3.com/NavList
Members may optionally receive posts by email.
To cancel email delivery, send a message to NoMail[at]fer3.com
----------------------------------------------------------------