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: Navigational Algorithms
    From: Michael Bradley
    Date: 2006 Oct 24, 17:50 +0100

    
    --- "James R. Van Zandt" jrvz@comcast wrote:
    
    'The main technical obstacle is the calculation of
     all the partial derivatives.'
    
    And there's the rub: many a good man has used up too
    much of life wrestling with numerical differentiation
    of small data sets - there's a high probability of
    comprimising the accuracy of the original data with
    the data smoothing routine normally used with
    numerical differentiation. On balance, with sparse
    data, I agree that the signal processing judgments
    should go through the brain of a navigator, preferably
    the one charged with the overall conduct of the
    vessel.
    
    With dense data, such as a train of GPS ranges being
    generated many times per second and from which
    statistics are 'easily' extracted, the problem becomes
    more suitable for machine computation.
    
    Mike Bradley
    
    55 01 N 1 27 W
    
    
    Send instant messages to your online friends http://uk.messenger.yahoo.com
    
    --~--~---------~--~----~------------~-------~--~----~
    To post to this group, send email to NavList@fer3.com
    To unsubscribe, send email to NavList-unsubscribe@fer3.com
    -~----------~----~----~----~------~----~------~--~---
    
    

       
    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