[time-nuts] New Japanese GPS accuracy

Magnus Danielson magnus at rubidium.dyndns.org
Wed Jan 5 03:15:06 UTC 2011

On 01/04/2011 07:39 PM, Joseph Gray wrote:
> No details on how the extra Japanese satellite is making it possible
> to get this accuracy.
> http://www.crunchgear.com/2011/01/04/new-gps-system-boosts-accuracy-to-3cm/

This is the first bird for the QZSS system. The Quasi-Zenith orbit 
creates a deformed figure of 8 over the earth, and has a fairly low 
speed while being overhead Japan. This helps significantly in urban 
canyons in Japan.

Just following links from that article you get some info, but searching 
for QZSS should give plenty of material.

A good example where a three-bird setup causes local improvements. 
Australians should also be happy about it.


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