NTP question

Thu May 2 21:04:07 UTC 2019

It is called Galileo :)
Ge

> Le 2 mai 2019 à 22:35, Scott Weeks <surfer at mauigateway.com> a écrit :
> 
> 
> 
>> But wait. What is the GPS constellation goes down? 
>> THEN we have bigger problems :)
>> --------------------------------------------------
>> 
>> 
>> What if the US military intentionally messes with 
>> the signal to thwart the advances of an enemy who 
>> is using GPS in their attack?  ;-)
> ------------------------
> --- mel at beckman.org wrote:
> 
> Enemies aren’t dependent on US GPS, by the way. lol!
> -----------------------------------------------
> 
> Oops, but still from the second link: "...which could 
> be disabled or degraded by their operators at any time"
> 
> Most big countries say the same: "...will provide an 
> alternative global navigation satellite system..."
> 
> scott
> 
> 
> 
> Details for the intrested.
> 
> 
> https://en.wikipedia.org/wiki/GLONASS
> 
> "Russian...provides an alternative to GPS and is the 
> second navigational system in operation with global 
> coverage and of comparable precision. 
> 
> 
> https://en.wikipedia.org/wiki/Galileo_(satellite_navigation)
> 
> "...live in 2016,[4] created by the European Union"
> "...so European nations do not have to rely on the 
> U.S. GPS, or the Russian GLONASS systems, which could 
> be disabled or degraded by their operators at any time"
> 
> 
> https://en.wikipedia.org/wiki/BeiDou
> 
> "a Chinese satellite navigation system....Beidou-1 was 
> decommissioned at the end of 2012."
> "BeiDou-2, became operational in China in December 2011 
> with a partial constellation of 10 satellites in orbit.
> Since December 2012, it has been offering services to 
> customers in the Asia-Pacific region."
> "In 2015, China started the build-up of the third 
> generation BeiDou system (BeiDou-3) for global coverage 
> constellation. The first BDS-3 satellite was launched on 
> 30 March 2015.[5] As of October 2018, fifteen BDS-3 
> satellites have been launched[6]. BeiDou-3 will 
> eventually consist of 35 satellites and is expected to 
> provide global services upon completion in 2020. When 
> fully completed, BeiDou will provide an alternative 
> global navigation satellite system to the United States 
> owned Global Positioning System (GPS),[7][8] the Russian 
> GLONASS or European Galileo systems and is expected 
> to be more accurate than these
> 
> 
> 
> https://en.wikipedia.org/wiki/Indian_Regional_Navigation_Satellite_System
> 
> "...is an autonomous regional satellite navigation 
> system that provides accurate real-time positioning 
> and timing services.[4] It covers India and a region 
> extending 1,500 km (930 mi) around it, with plans for 
> further extension."
> 
> 
> https://en.wikipedia.org/wiki/Quasi-Zenith_Satellite_System
> 
> "...a project of the Japanese government for the 
> development of a four-satellite regional time transfer 
> system and a satellite-based augmentation system for the 
> United States operated Global Positioning System (GPS) 
> to be receivable in the Asia-Oceania regions, with a 
> focus on Japan.
> 
> 
>