Welcome to the NavList Message Boards.

NavList:

A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding

Compose Your Message

Message:αβγ
Message:abc
Add Images & Files
    or...
       
    Reply
    Re: Symmedian talk
    From: Geoffrey Butt
    Date: 2017 Mar 1, 07:02 -0800

    Bill (in his video) assumes that errors attached to the three LOPs have a symmetrical Gaussian distribution.  This implies that there is a 50% chance that the true position lies on one side or the other of the plotted line.  Crudely, this implies that the probability of the true position lying within the 'cocked hat' is 0.5 x 0.5 x 0.5 - ie, a 7 to 1 chance that it lies outside.  I recall a discussion some years ago which refined the calculation of this probability, but still resulting in a greater chance of the true position lying outside the triangle.  Rather than concentrating on the niceties of finding the point of highest probability within the triangle, how would one approach the more useful specification of a boundary (circle?) which defines the inclusion of the true position with some specified probability?

    Geoff Butt

       
    Reply
    Browse Files

    Drop Files

    NavList

    What is NavList?

    Join NavList

    Name:
    (please, no nicknames or handles)
    Email:
    Do you want to receive all group messages by email?
    Yes No

    You can also join by posting. Your first on-topic post automatically makes you a member.

    Posting Code

    Enter the email address associated with your NavList messages. Your posting code will be emailed to you immediately.
    Email:

    Email Settings

    Posting Code:

    Custom Index

    Subject:
    Author:
    Start date: (yyyymm dd)
    End date: (yyyymm dd)

    Visit this site
    Visit this site
    Visit this site
    Visit this site
    Visit this site
    Visit this site