OK,

I'm not yet totally discouraged...

What's the format?  Could it still be done with
a TX RX short range setup?

You could send a correction for whatever bird
is coming in.

I don't remember if you have access to the individual
satellites with a cheap gps receiver?  Anyone?

Thanks

----- Original Message -----
From: "Dr Martin Hill" <mhill@RACE-TECHNOLOGY.COM>
To: <PICLIST@MITVMA.MIT.EDU>
Sent: Tuesday, November 19, 2002 10:35 AM
Subject: Re: [ot]: GPS differential corrections for home brewers??


> To do this properly you need to do it on a per satellite basis.  You can't
> just take the error from one position and use it as an offset for another
> receiver as you can't be sure they are both using exactly the same
> satellites to get their positions.
>
> Martin
>
> -----Original Message-----
> From: pic microcontroller discussion list
> [mailto:PICLIST@MITVMA.MIT.EDU]On Behalf Of rad0
> Sent: 19 November 2002 16:12
> To: PICLIST@MITVMA.MIT.EDU
> Subject: [ot]: GPS differential corrections for home brewers??
>
>
> Hello,
>
> I am wondering if it is possible to make a home brew gps
> differential transmitter?
>
> I know on my gps board, a small ashcroft, the corrections are
> input on a single pin, but I do not know how or in what format?
>
> So, what's the format, how is it done?
>
> And, I was thinking of using the inexpensive TX RX modules for
> transmitting the correction from a stationary second gps(from a
> known position), after receiving and calculating the error correction?
>
> Is this a reasonable approach?
>
>
> thanks
>
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