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SatNOGS | Open Source Satellite Ground Station Network | https://satnogs.org/ 5 Servers

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Timestamp Message
24 Jan 2020
09:42:59@julienn:matrix.orgjujunis the optical sync need a full dedicated network or it's possible to use usual optical fiber internet network ?
09:43:17@julienn:matrix.orgjujunif yes, maybe we can have enought GS with optical fiber internet
09:45:37@julienn:matrix.orgjujunon the other hand we could have a big virtual dish locally with RX about 100m appart, because optical fiber is cheap, but I really dont have any idea about the hardware needed to sync time with optical fiber, maybe it can be very simple, like a PPS sent with a SFP, it's a very simple hardware to build
09:46:24@julienn:matrix.orgjujunIt can be very simple, without any protocol, just bare PPS on the fiber
09:47:16@julienn:matrix.orgjujunIt's also very easy and cheap to have an optical splitter
10:01:36@julienn:matrix.orgjujunAlso, lower frequencies require lower clock accuracy, and there is more interresting things at lower frequency on satellite that require high gain : all the differents clocks, and non intentional radiation that can leak interresting stuff
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12:15:34@0xcoto:matrix.org0xcoto
In reply to @phasewrap:matrix.org
One thing to consider is pulsar observations using UHF yagis. This is something I'm experimenting with personally but I have seen it done
Pulsars are highly-accurate clocks, but the instrumentation needed to obtain the period of the pulsar to an acceptable accuracy is more demanding than an atomic clock. You’ll also need to account for the motion of the Earth around the Sun to correct for the apparent shift in the period.
13:07:28@cbassa:matrix.orgcgbsat 0xcoto: it's not that difficult to measure the spin period accurately; a GPS disciplined system should be sufficient
13:10:20@julienn:matrix.orgjujunanother way would be to have a rubidium clock (cheap) on each GS, but we need to ship them from the same place to sync them I guess
13:22:16@0xcoto:matrix.org0xcoto cgbsat: I was mainly referring to antenna requirements rather than system clocks to detect the pulsars
13:22:32@cbassa:matrix.orgcgbsatah, ok
13:24:06@julienn:matrix.orgjujunmaybe we have create an event each year so people comes with theire rubidium clock and sync :)
13:24:37@julienn:matrix.orgjujunI guess that it sould be quite fun to travel with a powered rubidium clock :D
15:01:12@dmarszk:matrix.orgdmarszkThings like that are fun: https://www.iqdfrequencyproducts.com/products/details/iqrb-3-1-01.pdf But you still need to feed it with super low-jitter PPS
15:03:55@dmarszk:matrix.orgdmarszkHeeey, maybe 5G will come with solutions in a decade or so https://www.gpsworld.com/timing-accuracy-down-to-picoseconds/
15:08:53@julienn:matrix.orgjujun dmarszk: you can find used rubidium clock on ebay for about 70 euros
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25 Jan 2020
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