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: Position lines with confidence weights
    From: Bill Lionheart
    Date: 2018 Oct 26, 06:33 +0100

    From the desk of the navigation-made-complicated department:
    
    So what is the generalization of the symmedian point when there are
    errors in each line have different variances? The answer is in
    
    R. Stansfield, “Statistical theory of DF fixing,” Journal of the
    Institution of Electrical Engineers-Part IIIA:
    Radio communication, vol. 94, no. 15, pp. 762–770, 1947.
    
    He defines a kind of weighted symmedian line and these intersect at
    the weighted least squares point. One might think analogously of a
    weighted centroid of a triangle with different masses at the vertices.
    
    OK so we have computers and calculators to do it now but in principle
    it could (have) be done graphically.
    
    Bill Lionheart
    
    
    On Sat, 20 Oct 2018 at 00:24, Antoine Couëtte  wrote:
    >
    > Enter twice the noon sight and once only each of the other observations.
    >
    > Then push the button and get the answer.
    >
    > Antoine
    >
    > View and reply to this message
    
    

    File:


       
    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