4 ms·

Is that the effective payload data rate after error correction has been applied or the actual transmitted bit rate meaning that the payload rate is much less? I

Is that the effective payload data rate after error correction has been applied or the actual transmitted bit rate meaning that the payload rate is much less? I've read that NH uses a 1/6 Turbo code for forward error correction. If true, that would imply that the transmitted data rate is actually 5 to 10 kbps or the payload rate (after e.c.) is 200-400 bps.

dogma1138 8y ago
That’s the data rate afaik http://pluto.jhuapl.edu/Mission/Spacecraft/Data-Collection.php http://pluto.jhuapl.edu/Mission/Spacecraft/Data-Collection.p... https://en.m.wikipedia.org/wiki/New_Horizons#Telecommunications_and_data_handling https://en.m.wikipedia.org/wiki/New_Horizons#Telecommunicati... Pluto encounter data rate was 2000 bp/s but that is with the spin, I’m guessing it’s lower now since it’s well past Pluto. I can’t find the link to the interview which had a bit more information about it now, but I don’t think they refer to the payload data rate.
- tabtab 8y ago
  New Horizons can't use many of its scientific instruments and cameras in spin mode. Spin mode gyroscopically stabilizes it so that its main antenna can be pointed more precisely, allowing a higher data rate. Thus, I suspect they won't want to enter spin mode until it's no longer doing any photographic or scientific observations of Thule. Therefore, data packets will be slow in the days before and after encounter because they want to still aim instruments; but this makes antenna pointing less precise. New Horizons can't chew gum and talk at the same time :-)
  - dogma1138 8y ago
    Again they won’t plan missions in this manner, in the rare event that they’ll need to override data they’ll have a clear protocol sending a summary in this case would be a waste of bandwidth.
    - tabtab 8y ago
      Both your statements are not clear to me. There still seems to be some unstated assumption that is confusing one or both of us.

dogma1138 8y ago

That’s the data rate afaik http://pluto.jhuapl.edu/Mission/Spacecraft/Data-Collection.php http://pluto.jhuapl.edu/Mission/Spacecraft/Data-Collection.p... https://en.m.wikipedia.org/wiki/New_Horizons#Telecommunications_and_data_handling https://en.m.wikipedia.org/wiki/New_Horizons#Telecommunicati... Pluto encounter data rate was 2000 bp/s but that is with the spin, I’m guessing it’s lower now since it’s well past Pluto. I can’t find the link to the interview which had a bit more information about it now, but I don’t think they refer to the payload data rate.

tabtab 8y ago
New Horizons can't use many of its scientific instruments and cameras in spin mode. Spin mode gyroscopically stabilizes it so that its main antenna can be pointed more precisely, allowing a higher data rate. Thus, I suspect they won't want to enter spin mode until it's no longer doing any photographic or scientific observations of Thule. Therefore, data packets will be slow in the days before and after encounter because they want to still aim instruments; but this makes antenna pointing less precise. New Horizons can't chew gum and talk at the same time :-)
- dogma1138 8y ago
  Again they won’t plan missions in this manner, in the rare event that they’ll need to override data they’ll have a clear protocol sending a summary in this case would be a waste of bandwidth.
  - tabtab 8y ago
    Both your statements are not clear to me. There still seems to be some unstated assumption that is confusing one or both of us.