Differences between revisions 5 and 6
Revision 5 as of 2012-11-30 05:38:11
Size: 898
Revision 6 as of 2012-11-30 06:36:55
Size: 908
Deletions are marked like this. Additions are marked like this.
Line 6: Line 6:
A smear function to try: A position dither function to try:

Array Phasing

When we randomly dither the position of the emitters in a 3 dimensional phased array, it smears out the grating lobes. I am looking for a better function.

A position dither function to try:

D = \lambda/2

k = 2 \pi / N * L

\Delta x = D * ( \sin( k z ) + \cos( k y ) )

\Delta y = D * ( \sin( k x ) + \cos( k z ) )

\Delta z = D * ( \sin( k y ) + \cos( k x ) )

... or some variation of that. This assumes the spacing L >> \lambda , a sparse array, so that the antennas do not couple (much). We can scale D and k, and also modify amplitudes across the array like a Hamming window, and see how that changes the sidelobes.

This happens on top of the array of perhaps hundreds of emitters on the thinsat itself, which beamforms to a few degrees of angle, reducing power splattered far from the target.


ArrayPhasing (last edited 2021-06-08 17:57:55 by KeithLofstrom)