On Thu, Jun 29, 2006 at 03:55:23PM +0200, Eugen Leitl wrote: > Are you aware of a Gray code that only has local bit flips, and > no singularities (such a wrap around with binary counters, where > a lot of bits flip)? Things are also nasty at the poles, so > probably a different orbit arrangement in the node cloud is needed.
That was a serious question, actually. There are a number of related questions: I think elliptic orbits are off-limits, because there's only one circle, but many ellipses. There must be a way to "precess" higher orbits to prevent addressing singularities at the poles, yet minimize the amount of speed delta between spatial neighbours (making flyby tracking more difficult). There are two special cases: Earth surface, and geostationary (which is just one specific orbit, because you may not intersect orbits at the same height), everything else has a serious delta relatively to Earth surface, and stratospheric lighter-than-air platforms. Another question is minimizing the problem of figuring out which space segment to relay to (spatial broadcast an option) by means of a short optical FIFO, a crossbar, and the right header layout, given the orbital address coding above. Another thing is dealing with predicting node position, so each node has to have a working hypothesis of how it next environment will look like. Optical gates are expensive, and stacking too many gates adds up delays, which are pure poison for relativistic cut-through. There are many other such related constraints, of course. Any takers? -- Eugen* Leitl <a href="http://leitl.org";>leitl</a> http://leitl.org ______________________________________________________________ ICBM: 48.07100, 11.36820 http://www.ativel.com 8B29F6BE: 099D 78BA 2FD3 B014 B08A 7779 75B0 2443 8B29 F6BE
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