4 ms·
The United States actually does have the ability to selectively degrade signals. I don't know enough to comment on this capability in more detail (another comme
by pietroglyph 8y ago
The United States actually does have the ability to selectively degrade signals. I don't know enough to comment on this capability in more detail (another comment seems to indicate that it is through jamming). A relevant excerpt (from 2000) is below:
> Additionally, we have demonstrated the capability to selectively deny GPS signals on a regional basis when our national security is threatened.
https://www.faa.gov/about/office_org/headquarters_offices/ato/service_units/techops/navservices/gnss/gps/policy/presidential/index.cfm?print=go#1 https://www.faa.gov/about/office_org/headquarters_offices/at...
- jhayward 8y agoAs I indicated above, separate systems on electronic warfare platforms can jam GPS signals. This is not part of the GPS system, and is what the article refers to. Building your own GNSS system does nothing to protect against electronic warfare platforms.
- vlovich123 8y agoSelective availability was defeated a long time ago which is one of the motivations for Clinton formally turning it off in 2000. Also while I'm sure that the US military is fully capable of turning off GPS satellites however they want the efficacy of this is probably limited considering the coverage of GLONASS + EGNOS.
- pietroglyph 8y agoThe point of that article is that a main justification for turning off selective availability was that the US could still deny access in certain geographic areas. Selective denial != selective availability.