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

From: Gary E. Miller
Subject: Re: [gpsd-dev] Using multiple location sources to improve accuracy and reliability
Date: Mon, 9 Jul 2012 11:05:02 -0700

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

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.

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

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