Satellites are routinely monitored by the likes of US, Russia and China. China for example is known to blind American spy satellites with lasers.
The goal is to track the approx 23000 (sources vary from 10 to 25000) objects, which could be anything from a satellite, debris from launches and even lost items from EVAs.
US monitoring systems
USSSN - US ...
The spacecraft's name is Tundra (or EKS). This is a ballistic missile detection system, designed to detect missiles launched from the US, or China (or their submarines, or insert rogue state here) and heading for Russia with their nuclear warheads.
The key to surviving a nuclear attack is early warning. Flight time is only 30 minutes to go halfway across ...
While the appearance of real spy satellites is generally classified, it's generally thought that there's a lot of commonality between the Hubble Space Telescope and the later Keyhole series satellites.
Some similarities are obvious; the aft cylindrical section of Hubble matches the midships portion of the model; both designs have narrow rectangular solar ...
Is it possible to update an existing TLE using new data?
Of course it is. How do you think TLEs are updated?
That said, it's not easy. You'll need to
Compute the Jacobian of your new data with respect to the elements of a TLE you might want to modify.
Come up with a weighting matrix that indicates which of those new data are better than others. For ...
To me the portion of the craft below the upward tilted "skirt" looks like an upper stage. Most like a Centaur but none of them had 4 engines. And certainly no Hubble-esque solar arrays attached to the engine mounts.
(incidentally they look like the first 2 sets of Hubble arrays, not the current ones)
Some upper stages remain attached to their payload and ...
If you select any sensor, clicking the "show surveillance fence" control shows the extent of the surveillance zone that sensor uses.
For example, Cape Cod gives a planar field, with a blank area west of the sensor:
And Diego Garcia gives a conic:
For voice and video communications, a 1-second delay is annoying. 10 seconds is way too much to be useful. Current data networks don't tolerate 10-second delays either so you'd need new communications technology. You'd also need large dishes on the ground instead of the small rod antenna now used in satphones.
Military surveillance of space can be done ...