Andy Green wrote:
Somebody in the thread at some point said:
| I'm using OM2007.2 updated to today morning (Thursday July 31), and
| TangoGPS.
| Also have the map cache directory on the card. Normally works fine, but
| when I move indoors,
| gps shows 10 satellite fixes and gives my
Hi there!
I'm not Andy obviously, but I think I still can answer that one ;)
Hi Andy,
I'm the guy who said that.
Actually I based my observation on the fact that i saw an entry of
10/x/y as the endmost entry on the TangoGPS status line.
Isn't that supposed to mean that it still has
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Somebody in the thread at some point said:
| Actually I based my observation on the fact that i saw an entry of
| 10/x/y as the endmost entry on the TangoGPS status line.
| Isn't that supposed to mean that it still has fixes from 10 satellites.
Our
Vinc Duran schrieb:
But... what are our chances GTA03 will have a 3D gyro?
Could the accelerometers be substituted for a 3d gyro?
No, you need both accelerometer *and* gyro measurements for dead reckoning.
Andreas
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Openmoko community mailing
On Friday 01 August 2008, Vinc Duran wrote:
On Thu, Jul 31, 2008 at 5:28 PM, Andreas Bogk [EMAIL PROTECTED] wrote:
snip
I'm not a mathematician, but I think I have sufficiently understood
Kalman filters and dead reckoning. A little known trick is to use
ordinary integration with the
Al Johnson schrieb:
We only need to replace 1 of the 2 3D accels with a 3D gyro. I've not looked
at the size or cost of solid state gyros so I don't know how practical that
might be.
Well, if this:
http://www.invensense.com/products/idg_300.html
had three axes instead of two, it would
Al Johnson [EMAIL PROTECTED] writes:
We only need to replace 1 of the 2 3D accels with a 3D gyro. I've not looked
at the size or cost of solid state gyros so I don't know how practical that
might be.
That's not a bad idea... I haven't looked into what accelerometers we have in
the FR,
:14 AM
To: List for Openmoko community discussion
Subject: Re: Warranty after fix for GTA02 GPS rework for SD card
interferenceissue
I haven't had any problems with TTFF since the software update was
done. In fact my impression from all the emails on the subject was
that the software fix
] On Behalf Of Jay Vaughan
Sent: Wednesday, July 30, 2008 1:24 AM
To: List for Openmoko community discussion
Subject: Re: Warranty after fix for GTA02 GPS rework for SD card
interferenceissue
(We have external LNA) It means it can track with a 16dBm reduction
in GPS signal after it made
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Somebody in the thread at some point said:
| Do folks know wher to find the SOP for the cap fix?
|
| Tony, if you havent already, go ahead and post the SOP for the cap
fix. It's
| easy enough to do
| And undo.
Did you ever do it, steve?
- -Andy
steve schrieb:
Amaybe when SD I/O occurs one could use the accelerometers to dead reckon?
Dead reckoning without gyros is pretty hard. In theory, the two
accelerometers are not mounted in the same place and thus could be used
to derive rotation, but in practice they're pretty close to each
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Somebody in the thread at some point said:
| steve schrieb:
| Amaybe when SD I/O occurs one could use the accelerometers to dead
reckon?
|
| Dead reckoning without gyros is pretty hard. In theory, the two
| accelerometers are not mounted in the
Andy Green wrote:
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Somebody in the thread at some point said:
| steve schrieb:
| Amaybe when SD I/O occurs one could use the accelerometers to dead
reckon?
|
| Dead reckoning without gyros is pretty hard. In theory, the two
|
This one?
http://wiki.openmoko.org/wiki/Image:Gta02_gps_10pf_rework_sop.pdf
On Thursday 31 July 2008, steve wrote:
Do folks know wher to find the SOP for the cap fix?
Tony, if you havent already, go ahead and post the SOP for the cap fix.
It's easy enough to do
And undo.
Tilman Baumann wrote:
Andy Green wrote:
Inertial navigation systems for the masses!
Anyone here who wants to write a kalman filter?
Besides the point that a small pocket-IMU would be great. To GPS jumts
that big exist? As fas as i understand GPS it should have little jitter.
Besides the point that a small pocket-IMU would be great. To GPS jumts
that big exist? As fas as i understand GPS it should have little jitter.
Trimble had a few GPS models out with dead reckoning. Not pocket
sized. I think they are all off the market now. I got one off Ebay a
few weeks ago
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Somebody in the thread at some point said:
| I'm using OM2007.2 updated to today morning (Thursday July 31), and
| TangoGPS.
| Also have the map cache directory on the card. Normally works fine, but
| when I move indoors,
| gps shows 10 satellite
Brian Wilson schrieb:
See http://www.trimble.com/tms/placer450.aspx?dtID=overview
They use a small gyroscope.
[...]
If you are walking around and want a reasonable position the Kalman
filter would probably be easier to deal with.
Is there a mathematician in the house?
I'm not a
On Thu, Jul 31, 2008 at 5:28 PM, Andreas Bogk [EMAIL PROTECTED] wrote:
snip
I'm not a mathematician, but I think I have sufficiently understood
Kalman filters and dead reckoning. A little known trick is to use
ordinary integration with the strap-down equation given the
accelerometer and
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