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: Fix Maximum Probability Positions
    From: Hanno Ix
    Date: 2013 Mar 19, 22:33 -0700
    John:

    I stumbled already over EQ 1. Your explanation for that one was a little short.
    A flag went up.


    Not sure I see things right right, but:

    There is one circle around the substellar point SSP1
    that has a mean radius R1 plus 'noise' N(0, sigma1). You did the CelNav on this one.
    You do not know your azimuth as of yet so you can be anywhere on that circle
    with the same probability. 

    There is another circle around SSP2; radius R2 + same  'noise' N(0,sigma).; 
    I did the CelNav on that one. I can be anywhere because I don't know my azimuth either.
    Same thing.

    EQ 1 , i.e. the multiplication of probabilitues, works if just one of us can be on both circles with equal probablity
    but without knowledge of azimuths. In that case, the most frequent points that you visit are the 
    intersections and EQ1 is correct. No problem here.

    However that is there is two of us. Since each of us can be somewhere on his circle as measured
    there very little chance we meet but we  occasionally do.

    I am wondering  therefore: Is the intersection not the point where the distance between is 
    must frequently zero? This way we would find the intersection without any knowledge about azimuths
    which neither one has anyway a-priory? Knowing now the intersection the azimuths follow.

    However, in that case EQ 1 would not apply.

    h







    From: John Karl <jhkarl---.net>
    To: hannoix---.net
    Sent: Tuesday, March 19, 2013 11:14 AM
    Subject: [NavList] Fix Maximum Probability Positions


    Attached is my latest contribution to the endless fix/MPP question. I hope we all agree that these discussions are interesting. And even useful at sea, but only to a degree where all of us would consider not the MPP, but the opposite -- the largest possible error when it comes to risking life and property.
    Happy armchair navigating.
    May you find your beer at its MPP,
    JK
    ----------------------------------------------------------------
    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
    ----------------------------------------------------------------

    Attached File:
    LOPs---Sigma.pdf (no preview available)

    View and reply to this message: http://fer3.com/arc/m2.aspx?i=122959


       
    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