On 2018-12-13, Jan Panteltje  wrote:

> Charlie Gibbs wrote
>
>> On 2018-12-13, Jan Panteltje  wrote:
>>
>>> So A GPS SOG (speed over ground) can be used to verify pitot tube
>>> type sensors.
>>
>> More or less.  Weather forecasting isn't perfect...
>
> Of course, but detecting a defective pitot tube and using SOG and
> wind to land instead is a good emergency strategy.

Indeed.  Those poor Lion Air buggers might have had half a chance.

>> Oh, I'm sure it's all there.  Tying it all together in the Flight
>> Management System with properly designed (and documented!) software
>> is another matter.
>
> Oh I dunno, been writing software now for ages, and designing stuff.
> It is not that hard.

Not for you and me, perhaps.  Big bureaucratic outfits are a
different matter, though.  And don't get me started on Microsoft.

> WAAS is GPS only AFAIK.
> We need the other systems too.
> Likely for example China and Russia have their own by now?
> So on a flight from the US to say China the system needs to support
> both - or soon both, systems.
> Oh and Europe will not stay behind.

Satellite-based augmentation systems (SBAS, the ICAO generic term for
WAAS-like systems) exist or are being developed on other continents.
A box that works with all of them might be tricky.  Damn that
NIH syndrome...

> Yes that is differential GPS, in my case the GPS in the remote
> is the ground station and the GPS in the drone the other one.
> They call that 'follow me' mode, follow the remote, is what it does,

Cool.  I suppose you could call that relative position rather than
absolute position since you're carrying the ground station around
with you rather than fixing it at an accurately-surveyed location.
But it must be great for drone operation.

--
/~\  cgibbs@kltpzyxm.invalid (Charlie Gibbs)
\ /  I'm really at ac.dekanfrus if you read it the right way.
 X   Top-posted messages will probably be ignored.  See RFC1855.
/ \  Fight low-contrast text in web pages!  http://contrastrebellion.com

--- SoupGate-Win32 v1.05