On 2017-02-02, David Taylor <[email protected]> wrote: > On 02/02/2017 04:34, sean wrote: > [] >> Incidentally I do have a BBB and a few raspberry pis. The BBB goes back >> and forth to/from work so I won't be able to use that as the NTP host. >> >> As an aside, have you done anything with SDR? You may be interested in >> this: >> https://github.com/flightaware/piaware > > Do lets us know how you get on with NTP. >
Absolutely. You and others have been very helpful with all the links and advice. > Yes, I've done some ADS-B stuff, although using others' code as I don't > do "C" myself. For multilateration we need times to better than a > microsecond (and ideally to within 100 ns) and this is achieved within > the software by comparing several aircraft which are mutually visible > between multiple stations, and for some of which GPS locations are known. > > http://www.satsignal.eu/raspberry-pi/dump1090.html > Your site has a little bit of everything, doesn't it?! You're probably aware but flightaware is selling these little devices: https://www.amazon.com/FlightAware-Stick-Receiver-Built-Filter/dp/B01M7REJJW/ref=sr_1_5?ie=UTF8&qid=1486076686&sr=8-5&keywords=flight+aware I would still need to get an antenna for it. But of course you have a link on how to make one: http://www.lll.lu/~edward/edward/adsb/antenna/ADSBantenna.html Is that the same one you're still using? > and, of course, I monitor the performance where I can, comparing > different systems: > > http://www.satsignal.eu/mrtg/performance_ads-b.php > > I've also just started with earthquake detection, something which > requires good time keeping (perhaps to within a second!) and may be of > interest to west coast USA members: > > https://www.raspberrypi.org/blog/raspberry-shake-personal-seismograph/ > Very neat. Even though I'm a proud owner of several pis, I don't check their blog out very much. I should because they have great content. Sorry for taking this so far off subject from NTP. _______________________________________________ questions mailing list [email protected] http://lists.ntp.org/listinfo/questions
