NavList:
A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding
Re: Dip-meter again
From: Alexandre Eremenko
Date: 2012 Apr 11, 19:49 -0400
From: Alexandre Eremenko
Date: 2012 Apr 11, 19:49 -0400
I've heard of the attempts to arrange a radio connection with submarines as very long waves (by the Germans, during WW II). This was for information transmision only, not for navigation. One can think of using such waves for navigation... You say 10 KHz. I am not sure about engneering viewpoint, but let me take a mathematician's viewpont:-) The speed of light is 300,000 km/sec. I divide this by 10 KHz (that is 10,000 oscillations per second) and obtain 30 km for the wave length (hope I made no mistake). This (I mean this order of magnitude) would be the theoretical limit of the accuracy in position determined from such long waves. Looks less accurate than Cel Nav to me, and not enough for an accurate missile launch. Alex. On Wed, 11 Apr 2012, Lu Abel wrote: > >> From an engineering viewpoint, Omega was a very interesting system. It relied on transmitting ultra LOW frequency radio waves. 10 kHz, as I recollect. Transmitters were set up around the world, with the result that a 400 m tall Omega antenna was the tallest man-made structure in at least two continents (Africa and Australia, if memory serves). It relied on the receiver constantly receiving Omega signals and counting phase shifts of the signal from a known starting location. Given this need, it would likely be impractical for submarine navigation. > > > >> ________________________________ >> From: Gary LaPook>> To: NavList@fer3.com >> Sent: Tuesday, April 10, 2012 12:42 PM >> Subject: [NavList] Re: Dip-meter again >> >> >> No, the INS was for the submarine and came in, I believe, in the late '50s, for some reason 1957 sticks in my head. >> >> Also there were other electronic systems that provided accurate navigation. LORAN-A, since WW2, LORAN-C in the '70s, and OMEGA. >> >> gl >> >> --- On Tue, 4/10/12, Alexandre E Eremenko wrote: >> >> >>> From: Alexandre E Eremenko >>> Subject: [NavList] Re: Dip-meter again >>> To: NavList@fer3.com >>> Date: Tuesday, April 10, 2012, 11:52 AM >>> >>> >>> >>> Fred, >>> >>> I suppose that when speaking of "inertial nav" as a guidance system, >>> they mean the nav of the missile itself, not of the submarine. >>> >>> To use an inertiale nav in the missle one > needs the position >>> of the starting point. This is what Sat nav was for. >>> >>> Now we see Shufeldt's report in new light:-) >>> The reaseach was made in 1957-1961 :-) >>> And then classified. >>> Exactly at the time when they developed the Polaris A-1 missile... >>> >>> When Transit became available, they declassified the Shufeldt report. >>> >>> So now we know what "Precision Cel nav" was really for:-) >>> >>> Alex. >>> >>> >>> >>> >>> >>> >>> >>> >> >> > > > > : http://fer3.com/arc/m2.aspx?i=118966 > > >
