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June 29th 09, 05:03 AM
posted to sci.astro,rec.radio.amateur.space,rec.radio.amateur.antenna,sci.astro.seti,sci.physics
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High data rate space transmissions through visible lightcommunication.
On Jun 28, 8:31*pm, Robert Clark wrote:
On Jun 28, 1:41 pm, Richard Clark wrote: On Sun, 28 Jun 2009 17:14:14 +1000, "Peter Webb" wrote: Furthermore, the radiation from a reflected area is isotropic - goes in all directions - and hence very little is directed towards the earth. Actually, it is lambertian in its distribution, and it would have a major lobe that was directed in rather typical fashion (at the same, but negative angle to the norm to the surface). *However, as is the intent of your response, very much less will find its way to the intended target. 73's Richard Clark, KB7QHC *This describes the reflection from the Iridium antennas as specular where most of the reflected light is concentrated in a single direction: SeeSat-L Apr-98: Method for predicting flare.http://satobs.org/seesat/Apr-1998/0175.html *About specular reflection: Specular reflection.http://en.wikipedia.org/wiki/Specular_reflection *We could get even higher concentration of the image by using parabolic mirror reflectors. So basically you discovered the parabolic antenna. Congratulations. CM |
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