My belief is, if you were looking at the H0 Master, and H0 has two Slaves, the two TDs (one to each slave) is sufficient to give you a position fix.
LORAN-A stations were closer together than LORAN-C (maybe 600 mi). Nothing I have read to date indicated there were more than 2 Slaves per Master. Since it seems impossible to distinguish between the Slaves, based on their signals, there might be two apparently valid position solutions. -John ============== > So if I read the excel correctly you only actually need 1 system. > Say H0 is the master then the delays for H1-X is how far away from the > master the pulse would be. More importantly you would only need 2 other of > the Hs to create a navigational fix. > Is this a correct interpretation? > Have to go dig out of the snow. > > On Sat, Jan 8, 2011 at 10:35 AM, Magnus Danielson < > mag...@rubidium.dyndns.org> wrote: > >> John, >> >> >> On 08/01/11 16:08, J. Forster wrote: >> >>> Pondering some more on this, doing some calculations (spread-sheets) >>> the >>> actual scheme emerge... the range of 0 to 7 is not selected by >>> accident. >>> >> >> I had essentially the same spread sheet... >> >> However, how would you be able to achieve simplicity of design by being >> true to the PRI/PRR given or to what seems like reasonable counter based >> solution. Notice that the ARN-4 has a "Crystal phasing" control to >> adjust >> the crystal frequency of the receiver so that the receiver will align up >> to >> the actual rate of the master station. >> >> I think the PRI/PRR given is a presentation simplification rather than >> true >> numbers. Considering that absolute frequency was not a requirement, the >> repetition rate of the master needs to be sufficiently stable for >> distinction of station and the receiver to make stable reading, in >> presence >> of other stations. >> >> That LORAN-C uses GRI indications with repetition rate in microseconds, >> and >> fairly even such numbers as well, is another hint. >> >> Thus, I view the PRI/PRR ratios as approximations at best, a matter of >> presentation rather than actual nominal rates. >> >> Cheers, >> Magnus >> >> >> _______________________________________________ >> time-nuts mailing list -- time-nuts@febo.com >> To unsubscribe, go to >> https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts >> and follow the instructions there. >> > _______________________________________________ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.