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    Re: AP terminology
    From: Douglas Denny
    Date: 2009 Nov 17, 17:18 -0800

    "....It looks like that one-body fix problem again.  John Karl and I gave 
    formal solutions to this a few months ago.  I don't know of any historical 
    reference actually giving such a solution.  That is certainly because the 
    method is rather impractical, so it is never used and described...." 
    =========
    There was a practical one-body fix device that I know of.  It was probably 
    very expensive indeed so was not taken beyond evaluation stage I believe.
    
    The US Navy in the 1960s developed a celestial radio source tracker which gave 
    continuous position fix using both azimuth and altitude tracking with an 
    early computer used for the calculation. I suspect the advent of digital 
    computers might have stimulated the development of this kit as an exercise to 
    see if it could be done. It would have been very difficult with analogue 
    electro- mechanical resolvers prior to this.
    
    It was a large piece of equipment with a dish of about 1&1/2 Metre diameter.  
    It was not developed further than evaluation stage I believe.   In effect it 
    was a miniature, accurately tracking, radio observatory sat on the deck of a 
    ship. 
    
    I cannot remember but think it used the Sun as a primary source and possibly 
    Jupiter. The detail of the radio detection required in terms of sensitivity 
    and obtaining good resolution was very interesting I recall. 
     
    I have seen reference to this equipment in the Journal of the Royal Institute 
    of Navigation including a picture, but cannot immediately find it to give a 
    better reference.
    
    Douglas Denny.
    Chichester.  England.
    
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