This is what happens today. We know there is at least a primary beam and a backup beam, and the terminal can pick the backup if it feels necessary (eg. the primary becomes obstructed). Technically, you could have 8 beams on a cell, each on a different frequency, and a subset of terminals use beam #1 as primary, #2 as backup, another subset use beam #3 as primary, #4 as backup, and so on.
Best, Mike On Aug 31, 2022, 12:06 +0200, David Lang <[email protected]>, wrote: > I was actually referring to the possibility that the home dishy could point at > different satellites, so you could have multiple satellites pointing at a > given > cell on the same frequency, and the dishy can aim it's beam to pick which one > to > hear as well as which one to transmit to. > > David Lang > > On Wed, 31 Aug 2022, Mike Puchol via Starlink wrote: > > > On this particular one, the gateway beams are extremely narrow, around 1.5º > > to 2.5º. SpaceX is working on “mega-gateways” where 32 antennas will > > co-exist. They are also deploying a new gateway design with a larger > > antenna, and thus narrower beamwidth and more gain, allowing for a > > considerable reduction in TX power. > > > > Best, > > > > Mike > > On Aug 31, 2022, 09:33 +0200, David Lang via Starlink > > <[email protected]>, wrote: > > > On Wed, 31 Aug 2022, Ulrich Speidel via Starlink wrote: > > > > > > > This combines with the uncomfortable truth > > > > that an RF "beam" from a satellite isn't as selective as a laser beam, > > > > so the options for frequency re-use from orbit aren't anywhere near as > > > > good as from a mobile base station across the road: Any beam pointed at > > > > you can be heard for many miles around and therefore no other user can > > > > re-use that frequency (with the same burst slot etc.). > > > > > > not quite, you are forgetting that the antennas on the ground are also > > > steerable > > > arrays and so they can focus their 'receiving beam' at different > > > satellites. > > > This is less efficient than a transmitting beam as the satellites you > > > aren't > > > 'pointed' at will increase your noise floor, but it does allow the same > > > frequency to be used for multiple satellites into the same area at the > > > same > > > time. > > > > > > David Lang > > > _______________________________________________ > > > Starlink mailing list > > > [email protected] > > > https://lists.bufferbloat.net/listinfo/starlink > > > _______________________________________________ > Starlink mailing list > [email protected] > https://lists.bufferbloat.net/listinfo/starlink
_______________________________________________ Starlink mailing list [email protected] https://lists.bufferbloat.net/listinfo/starlink
