I'm a little late to the party, but I did a similar study on ridesharing's influence on DWI rates in Austin, TX before and after Uber and Lyft arrived and then exited the city, you can read it here:…
Forward error correction can add significant overhead. From the specification of the RF subsystem posted earlier (http://www.boulder.swri.edu/~tcase/NH%20RF%20Telecom%20Sys%2...), 5/6 of the data returned is redundant.
New Horizons is using a 1/6 rate Turbo code for forward error correction, meaning 5/6 of the data returned is redundant. Previous discussion: https://news.ycombinator.com/item?id=9890476
Much faster data rates I suspect - you can spend some of that on forward error correction to compensate for rain fade.
Pretty much - call that antenna gain, it's much cheaper to put bigger and better hardware on the ground. Recall though that the signal still goes through a TDRSS satellite, which also has a bigger dish.
Other more obscure methods of communicating with the ISS include the Russian Lira and Regul systems as well as the Japanese Ka-band dish on the external lab.
Can't speak for S-band, but Ku-band data rates are 25 Mbps Earth-to-ISS and 300 Mbps ISS-to-Earth, which is the maximum supported by TDRSS Ku-band links. Data rates may drop a bit depending on the individual satellite…
Elaborating on TDRSS a little bit - the ISS has allotments on both S- and Ku-band transponders (there are several per satellite) and hands off between satellites (TDRSS is geostationary) as it orbits, it's rare that…
Try space-filling curves! http://www2.isye.gatech.edu/~jjb/mow/mow.html
I'm a little late to the party, but I did a similar study on ridesharing's influence on DWI rates in Austin, TX before and after Uber and Lyft arrived and then exited the city, you can read it here:…
Forward error correction can add significant overhead. From the specification of the RF subsystem posted earlier (http://www.boulder.swri.edu/~tcase/NH%20RF%20Telecom%20Sys%2...), 5/6 of the data returned is redundant.
New Horizons is using a 1/6 rate Turbo code for forward error correction, meaning 5/6 of the data returned is redundant. Previous discussion: https://news.ycombinator.com/item?id=9890476
Much faster data rates I suspect - you can spend some of that on forward error correction to compensate for rain fade.
Pretty much - call that antenna gain, it's much cheaper to put bigger and better hardware on the ground. Recall though that the signal still goes through a TDRSS satellite, which also has a bigger dish.
Other more obscure methods of communicating with the ISS include the Russian Lira and Regul systems as well as the Japanese Ka-band dish on the external lab.
Can't speak for S-band, but Ku-band data rates are 25 Mbps Earth-to-ISS and 300 Mbps ISS-to-Earth, which is the maximum supported by TDRSS Ku-band links. Data rates may drop a bit depending on the individual satellite…
Elaborating on TDRSS a little bit - the ISS has allotments on both S- and Ku-band transponders (there are several per satellite) and hands off between satellites (TDRSS is geostationary) as it orbits, it's rare that…
Try space-filling curves! http://www2.isye.gatech.edu/~jjb/mow/mow.html