Hi I have a question about the GPS antenna. Since the GPS signal strength on the ground is about 20db lower than the thermal noise, does the gain of antenna matter?
2015-01-16 7:01 GMT+08:00 "Björn Gabrielsson" <b...@lysator.liu.se>: > Magnus, > > >>> If civilian receivers where to implement L2C and L5 which now is > >>> becoming common, they would gain quite a bit of precision in a similar > >>> fashion. For car navigation, the GPS would know which lane you are in. > >> > >> There ARE civilian receivers doing this, and has been for quite some > >> years. And its not from only a few vendors - all the big ones have it - > >> Trimble, Novatel, Topcon, Javad, Leica, Septentrio and a few more. There > >> are now receivers tracking "GPS L1/L2/L2C/L5, Galileo > >> E1/E5A/E5B/AltBoc/E6, GLONASS L1/L2/L3, BeiDou B1/B2/B3, QZSS L1/L2/L5" > >> > >> The price exceeds my home hobby budget, but so does a replacement > >> CS-tube > >> a factory new OCXO based GPSDO and many other things you can sometime > >> find > >> at reasonable cost used/recycled. > > > > I naturally meant with a reasonable price-tag, sorry for being sloppy on > > that detail, and I do know that there is vendors for those signals. > > > > If we had dual or triple frequency receivers below 500 USD things would > > start to be interesting. If high-volume kits would be just twice as > > expensive, it would be possible to consider for more luxury models. > > Receiver with 24 universal channels each of GPS L1/L2/L2C/L5 is cheaper > than a entry level TCXO-based 19" GPSDO (M300GPS @ Dustin). And about the > same price as a modern Loran receiver. What is a reasonable commercial > price? > > But yes, multi frequency GNSS is much more expensive than the Oncore, > Ublox traditionally used in a GPSDO. Is the performance gain worth the > cost? Certainly not for all but a few. > > On the oscillator side, we consider everything from XO, TCXO, OCXO, DOCXO, > to devar based designs - BVAs and others, and rubidiums, cesiums and > Masers. What are reasonable price-tags for oscillators compared to various > time transfer capable receiver? > > -- > > Björn > > _______________________________________________ > 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.