A third type of printed dipole
MPAR (Multi purpose Phased Array Radar) antenna that can be considered intermediate type of the two shown above. This one is for much higher frequencies and thus smaller. But has the printed dipole flange concept, just crossed.
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It is an underappreciated fact that $ASTS Bluebird constellation is capable of rendering Russian GLONASS system ineffective globally or regionally while not jamming allied GPS.
The LEO PNT-Denial military use case.
(One of many)
🧶🐈⬛
I was asked to comment on Space-x last Ex parte letter that they have filed to the FCC.
So here is the picture:
$ASTS has asked authority to launch full constellation beyond 25 satellites.
Space-x wants to delay and complicate that.
They keep filing all the way to sunshine 1/
It’s extremely uncompetitive behaviour and a bit immoral as what Space-X has begged be implemented onto AST is the same type of regulations they see as an obstacle when applied to themselves.
What they ask that AST shall not be allowed to is what they themselves do.
Golden rule?
It’s important to grasp that the next 20 satellites and the Block1s are approved already.
So this pen-fighting is about about satellites to launched beyond Q1 2026.
_One way to increase Area spectral efficiency is lowering constellation altitude.
That way comes at two costs: The number of 🛰️satellites required on orbit increases and their orbital dwell ⏳time decreases both affecting the replenish rate 🛠️adversely as:
🛠️ = 🛰️/⏳
🧶🐈⬛
1/n
Let’s do a SpaceMob thing and look at this from first principles.
A satellite has a field of view. FoV.
That Field of View projects a footprint on earth.
The footprint increases with angle of the field of view and increases with altitude.
2/
Within this field of view the satellite creates beams.
They also have an angle called beamwidth and a footprint called beamcell.
There are many of these beams and beamcells within the satellite footprint.