Things has molecules in them. They react to electromahnetic fields differently.
And you can add resolution/ signature by formation flying, by dual polarization and by large bandwidth.
AST does all of that. ✅✅✅👀
2/n
Hypothetically such arrays can collect very high res data of the world under their area of coverage. Intermittently and report by means of AI any changes.
Any new soldier, vehicle or mine down to 0.5 metee depth.
This would evaporate much of the fog of war.
3/n
This is one of many hypothetical non-coms Department of Defense use cases of sets of large phased arrays in BB1 frequenzy bands.
These use cases are worth Billions USD each in case of war.
@NathanBabb14 SWIR and Electro optical is good at identification. And SWIR is good at seeing through haze / clouds
But FOPEN radar sees through foliage and shallow soil.
And does detection and Recognition well.
2/n
@NathanBabb14 For a ”skynet” type ominpresent AI powered network of sensors you need to combine into a system of systems. Where some add recognition some identification some detection and do that in all parts of elektromagnetic spectra
2/n
@NathanBabb14 As the systems you allude to is well known the peer adversary hides its assets from those sensor under soil and under foliage.
An satellites based FOLPEN radar takes that possibility away from the enemy and make them subject of precision strikes wherever they hide.
4/n
@NathanBabb14 That does not negate the value of other types of earth obvservation, eo, systems.
On the contrary they are subject to network effects and adding systems w new capabilities to such system of systems increases their aggregate value.
5/5
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A few aspects of a NTN system design affects the area spectral efficiency of the system.
I have touched on them and how they relate to Shannons law.
High directivity that creates narrow beams and small cells is key.
See my pinned tweet.
Then there is also interference.🧶🐈⬛
We can think of this as the area spectral efficiency aSE as the main metric by which MNOs will choose which Satellite Network Operator Mobile to work with.
And interference is the metric by which regulators select which SNO-Ms are allowed to operate at all.
Gain affects both
/2
Lets consider this image.
It shows the wide beam of smaller arrays (from 2 antennas wide) and the narrow beam of a medium sized array (up to 64 antennas wide)
Creating a beam cell we use the central strongest part of the beam marked in red and blue.
Adhering to interference regulations of aggregate OOBE PFD limits would require a deficient system, such as Starlink d2c v2 mini, to use very wide guard bands and/or throttle (shrink) their power.