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GPS accuracy - I see not much has changed
On Fri, 20 Nov 2009 22:18:25 -0800, "floyd rogers"
> wrote: >"Matthew Russotto" > wrote >> There has been one change since then which will allow more accuracy >> and precision; wide area differential GPS. However, unless my >> information is out of date, the satellites capable of that have little >> coverage and most of it is on water. Many GPS units can use it if >> available though. > >Not quite right. It's WAAS, Wide Area Augmentation System. This >system uses around a dozen ground systems that cover N. America >and send out corrections for atmospheric variations. It allows guaranteed >30-meter (IIRC) accuracy. Is that for Vertical or Horizontal accuracy?? This is used by airplanes equipped with GPS >and flight-control software to accurately follow constrained landing paths. >All of Alaska Airlines planes are equipped, and they use the RNAV >capabilities to fly into valleys on pre-defined paths; and into Washington >National because of it's security corridor. > >Many hand-held GPSs have WAAS capabilities, but it hardly matters. > >FloydR > |
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#12
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GPS accuracy - I see not much has changed
"Ashton Crusher" > wrote
> On Fri, 20 Nov 2009 22:18:25 -0800, "floyd rogers"wrote: > >>"Matthew Russotto" > wrote >>Not quite right. It's WAAS, Wide Area Augmentation System. This >>system uses around a dozen ground systems that cover N. America >>and send out corrections for atmospheric variations. It allows guaranteed >>30-meter (IIRC) accuracy. > > Is that for Vertical or Horizontal accuracy?? Both: http://www.aviationbanter.com/showthread.php?t=15401 FloydR |
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