I agree that it's good to have backups, but a lot of this article seemed like a Locata sales pitch. The medium Earth orbit used for PNT satellites is great for being uncrowded, and the direct ascent ASAT threat isn't nearly has high or destructive in MEO. Additionally our new vehicles have safety of life signals on another band just for catastrophic events, because like the article mentioned, the world cannot function without GPS. A lot of people understand the value of the navigation signal, few realize that the timing signal is what basically the entire global economy depends on. Banks, cell towers, SATCOM satellites etc. all run off of the GPS timing signal.
Uplink jamming is an option, but that takes a lot of power, and that amount of power can be easily located.
Downlink jamming happens all the time. There's not a whole lot the average civilian user can do about that.
The space environment threat isn't nearly as bad as the article portrays it to be. It's much more of a concern to LEO satellites.
The real threat to all space systems these days is the cyber threat. Even still, it is incredibly unlikely that any organization/nation could affect the constellation to the degree that would cause operational failure.
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