To get crowded up there.
China will expand its home grown GPS rival Beidou by launching three global positioning satellites that it hopes will make it possible to have the service up and running in Asia Pacific by the end of the year. Beidou, which translates as “Big Dipper”, will be able to provide a high quality positioning, navigation and time …
To get crowded up there.
And I managed to pronounce both as "Buy-doo". Can someone please enlighten me how these two names might be pronounced differently?
Well, Beidou will be pronounced 'Compass' when it goes global.
"Bay-doh" and "Bai-doo"
In the same manner as to how 'Beijing' is pronounced as 'Peking'.
Beidou-1 has been in service since 2000 with 3 satellites, though it is classified as experimental.
Beidou-2, or Compass [BeiDou (Compass) Navigation Satellite System], is a new system, launched in 2011. This has 11 satellites in orbit now, with reported plans to extend this number to more than 70 to provide global coverage.
And I say "Doobie Doobie Doo"
could any one of the estweemed technical experts comment on the relative technical merits of the rivalling sat nav systems?
other then the fact that since it is newer, it might be more accurate? then "no" there aren't any technical merits. The reason behind the alternative satnav system is a political one and not a technical one.
If you have a GPS receiver that can simultaneously interpret the signals from more systems than the standard GPS then you are more likely to get an accurate fix due to the higher number of visible satellites.
However, it might affect processing time for the first fix as it calculates the geometries etc from different systems especially if you can't use AGPS.
If there are multiple owners (systems), then if one decides to end it's service or dick around, then your kit will continue to work. Future compatible kit will be more resilient.
"will be able to provide a high quality positioning"
"It is currently able to locate to within ten metres in most of mainland China"
GPS maybe. But I'd like to see someone satnav their way aroundf Peking with 10mtr accuracy.
(Turn left 9.5mtrs ago!)
GPS can be turned off a or a completely new coding system introduced any time that the USA DoD
feels like; with so much stuff depending on global navigational and time distribution it makes some
sense for other countries to have their own satnav.
However to me 4 systems (GPS, GLONASS, Beidou, Galileo) seems excessive.
Looks like India will have a working constellation up before Galileo.
Let's have less GLONASS and more GLASNOST from you m'lad
I'm fascinated to know what orbits these satellites use that result in non-uniform coverage. Such orbits do exist, but they aren't used by American GPS, or Galileo.
Is it not a matter of them using conventional orbits, but having a fairly sparse constellation? Presumably any given point on the Earth's surface can see these satellites at one time or another, but only certain bits of the planet can actually guarantee sufficient coverage for a positioning system to work?
This makes more sense if the Beidou-1 satellites are involved too, given that they are in geostationary orbits.