Re: opensource_gps Digest, Vol 61, Issue 1

Hi Andrew,

I did some work on the gpl_src over the last few months, mainly for my
own enlightenment. Such as warm allocation and some tracking
improvements, I also added calculation of the txco correction and
experimented with Kalman filtering the position solution. Is there a
review panel for incorporating changes?
I also had a couple of questions, you mentioned somewhere that the arm
runs faster with 2byte shorts as opposed to 4 bytes integers. Is this
significant my version of the code runs out of steam when tracking 9 or
more satellites and acquiring on the other 3 channels.
One more thing I noticed that Eric Hagermann managed to add WAAS
processing but I don't see the code anywhere. I cannot get my code to
lock onto the waas frames although all the pieces seem to work when
tested, ie I can track the signal, viterbi decode the data stream and my
CRC checksum routine works when tested on data in a file but I don't get
a 0 checksum from the satellite data stream.

Any thoughts or comments gratefully appreciated.

Mark 

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Subject: opensource_gps Digest, Vol 61, Issue 1

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Today's Topics:

   1. Porting OSGPS to ARM7 (scott nichols)
   2. Re: Porting OSGPS to ARM7 (Andrew Greenberg)


----------------------------------------------------------------------

Message: 1
Date: Thu, 14 Jan 2010 10:01:11 -0800
From: scott nichols <[email protected]>
Subject: [OpenSource_GPS] Porting OSGPS to ARM7
To: [email protected]
Message-ID:
	<[email protected]>
Content-Type: text/plain; charset="iso-8859-1"

Hello!

I am starting the process of porting OSGPS to a main loop style program
running on an embedded ARM platform. I was wondering if there is similar
open source project anyone knows of using OSGPS and ARM in a main loop?
Forgive me if this is covered in the documentation, I am off to read
more
now! Thanks!

-Scott
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Message: 2
Date: Thu, 14 Jan 2010 10:16:35 -0800
From: Andrew Greenberg <[email protected]>
Subject: Re: [OpenSource_GPS] Porting OSGPS to ARM7
To: scott nichols <[email protected]>
Cc: [email protected]
Message-ID: <[email protected]>
Content-Type: text/plain; charset=ISO-8859-1

Hi Scott,

Check out GPL-GPS:

http://gps.psas.pdx.edu/

It's essentially OSGPS ported to the GP4020, which is GP2020 correlator
plus an old ARM7.

Note that the project is a bit stale now - OSGPS has moved on, and
GPL-GPS really needs to be updated to the latest OSGPS bits. We hope to
do more work on it this summer, including working on porting it to an
FPGA board.

Andrew

scott nichols wrote:
> Hello!
> 
> I am starting the process of porting OSGPS to a main loop style
program
> running on an embedded ARM platform. I was wondering if there is
similar
> open source project anyone knows of using OSGPS and ARM in a main
loop?
> Forgive me if this is covered in the documentation, I am off to read
> more now! Thanks!
> 
> -Scott
> 
>  
> 
> 
>
------------------------------------------------------------------------
> 
> _______________________________________________
> opensource_gps mailing list
> [email protected]
> http://lists.psas.pdx.edu/cgi-bin/mailman/listinfo/opensource_gps

-- 
-------------------------------------------------------
Andrew Greenberg

Portland State Aerospace Society (http://psas.pdx.edu/)
[email protected]  P: 503.788.1343  C: 503.708.7711
-------------------------------------------------------



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