Dale Brown [1] wrote about this in his series of military techno-thriller novels, I think somewhere around Wings of Fire, written in 2002. Basically the idea is to have easy to launch constellations of micro-sats that could be launched to LEO to cover a specific area for a few days or weeks.

If this does come to fruit in real life, it wouldn't be the first time that ideas from his books have become reality 10-20 years later.

[1] https://en.wikipedia.org/wiki/Dale_Brown