Hi Omega is a lane based system. You need to know your start point to keep track of where you are. That made small boat units impractical. Pre-GPS Loran was pretty much the only small boat option. Once cheap GPS came out, Loran sales in that market went to zero.
Bob On Jul 29, 2013, at 8:57 AM, J. Forster <j...@quikus.com> wrote: > Well, OK, but I never saw a small, <$500 box that could be put on pleasure > boats, etc. and directly read out Lat/Long. Such things were available at > the local boating store for LORAN. > > -John > > ==============. > > > > >> John, Omega did make it into the 'uP age' I briefly got involved in the >> 80's and my first patent was for using DSPs and software radio for an >> Omega development . The key thing was Omega was genuinely world wide >> from a small chain of transmitters and one of the important users had to >> do their navigation while staying underwater for weeks on end, even >> Loran had limitations never mind satellite. >> >> It might be the answer "the mystery Collins Ru" posting here, I remember >> similar items in airborne Omega receivers, the omega carrier frequencies >> were low but the receiver bandwidths were measured in mHz and phase >> error was critical hence the boxes I saw included similar references. >> >> Its rather painful to see all the warnings about GPS made 30 years ago >> having to be re addressed. I suspect Loran will not get a big revival, >> the important development since the '80s is probably cheap MEMS inertial >> measurement sensors that give a user a secure cheap independent >> accessory to integrate with GPS etc. Its not an alternative but a rather >> useful thing to merge into a system to help deal with spoofing or other >> signal loss, this page from Analog Devices shows prices and performance: >> >> http://www.analog.com/en/mems-sensors/mems-inertial-measurement-units/products/index.html#iSensor_MEMS_Inertial_Measurement_Units >> >> There are other opportunistic navigation systems that try (tried?) other >> approaches such as Peter Duffett-Smith's Cursor system which I think is >> now in the hands of CSR. >> >> Regards >> David >> >> >>> ---------------------------------------------------------------------- >>> >>> Message: 1 >>> Date: Sun, 28 Jul 2013 15:24:30 -0700 (PDT) >>> From: "J. Forster" <j...@quikus.com> >>> >>> Subject: Re: [time-nuts] GPS Spoofing >>> >>> I'm not so convinced about this: >>> >>> "OMEGA was the primary means of radio navigation, world wide, from 1976 >>> to >>> 1997. ." >>> >>> There was LORAN-C, after all. >>> >>> And Omega was a CW, phase difference system, LORAN a pulse system. >>> >>> AFAIK, Omega never really made it into the uP age; LORAN certainly did. >>> >>> -John >>> >>> =========== >>> >> >> >> _______________________________________________ >> 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. _______________________________________________ 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.
