Re: [gpsd-dev] Using multiple location sources to improve accuracy and reliability

[Gary E. Miller]

Yo Chris!

On Mon, 9 Jul 2012 10:29:08 -0700
Chris Kuethe <address@hidden> wrote:

> I'm just saying that I don't see any documentation casually laying
> around that describes the procedures for
> installing/calibrating/maintaining such a device correctly, either for
> aircraft or marine use.

There is a TSO that specifies GPS standards for aircraft usage.  They
require that aircraft GPS have one more sat in use for 3D than minimally
required for a fix.  Then the GPS computed altitude is compared to a
barometric altimeter.  If the multiple GPS solutions do not match each
other, or match the barometric altitude, then the GPS must flash a RAIM
error.

I could prolly dig out the TSO for you, but that above is basically all
the goodness you would get from it.

In a modern transport category aircraft the multiple GPS are just more
sensors, along with ILS, VOR, INS, radar altimeter, etc. that are fed
into the master nav computer.

RGDS
GARY
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Gary E. Miller Rellim 109 NW Wilmington Ave., Suite E, Bend, OR 97701
        address@hidden  Tel:+1(541)382-8588

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