Simon Wood
Simon Wood
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Simon Wood's Discussions

DCM in python

Started this discussion. Last reply by Roy Brewer Feb 11, 2010. 20 Replies

Mostly as a understanding/learning exercise I am coding a DCM in Python based on the write up of the ArduIMU. My 'sensor' is a Wii Nunchuck with a Motion+ mounted inside the Nunchuck, interfaced to a…Continue

Gerbers Available?

Started Jan 13, 2010 0 Replies

I found the PDF of the layouts, but it's not 100% clear. Are the gerbers available, or do the developers wish to keep them? ... which would be OK.I'd like to look to see if the layout can be tweaked…Continue

RSS feed for podcasts?

Started this discussion. Last reply by Chris Anderson Jan 6, 2010. 1 Reply

Is there a non-itunes feed for the pod/videocasts?MungewellContinue

Tilting gyro's axis to improve yaw noise on low velocity UAVs

Started this discussion. Last reply by Koide Jan 13, 2010. 3 Replies

Looking through the code (and the various discussions on the web) I note that the 3axis Acc uses gravity to provide stabilisation of the gyros for pitch and roll axis, but the yaw is not compensated…Continue

 

Simon Wood's Page

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Simon Wood commented on ionut's blog post 'Improving GPS accuracy'
For RTK to work you will need (at least) 1 way data channel for corrections, and a processor (PC?) to perform calculations. The library is straight C, so could run directly on a processor of your choice (given enough MIPS). Correction data can be…
Monday
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Simon Wood commented on ionut's blog post 'Improving GPS accuracy'
It's been mentioned here before several times..... http://www.rtklib.com Just add a couple of (cheapish) uBlox and SkyTraq receivers, or if your budget stretches to it a survey grade receiver such as Trimble, Novatel or TopCon you can get…
Monday
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Simon Wood commented on Mike Pursifull's blog post 'Google's Robotic Cars'
The wheel encoder is pretty standard for IMU/GPS navigation, however you can tap into the CAN-BUS to get pretty much the same information from the ABS sensors.   I wonder how 'Shelly' is getting along these days?
Oct 20, 2011
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Simon Wood replied to Noland's discussion 'Realtime DGPS with ublox and GPSTk lib processing, relative <1m?'
Here you go... collected with a survey grade antenna: http://dl.dropbox.com/u/34518077/skytraq.bin
Aug 15, 2011
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Simon Wood replied to Noland's discussion 'Realtime DGPS with ublox and GPSTk lib processing, relative <1m?'
'About right' for the base station should mean that the RTK offset position is good.   No real suggestions for antennas, but here are a couple of reference stations moderately close (~50km might be pushing…
Jul 5, 2011
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Simon Wood replied to Noland's discussion 'Realtime DGPS with ublox and GPSTk lib processing, relative <1m?'
Something sounds wrong with your system. What accuracy/variation do you get if you process the individual data sets on their own as 'stand alone'. Average the position of the 'base' and use this as the 'seed' position…
Jul 5, 2011
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Simon Wood commented on Nathan's blog post 'More details on Minuteman'
> GPS at most will give you a 5Hz update rate   If you have the cash you can get a 'real' GPS with 20Hz (or even 100Hz) outputs, but interpolating with the help of odometer, compass, magnetometer, and 3D accelerometers sounds a…
Apr 29, 2011
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Simon Wood commented on Jason Dorie's blog post 'Propeller DCM'
This might be due to my (mis)understanding of how drift compensation works. I'm thinking that you compensate for drift on each gyro axis separately (as they would all be drifting at different/slowly varying rates anyhow). If you are static and…
Apr 14, 2011
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Simon Wood commented on Jason Dorie's blog post 'Propeller DCM'
I did mean just in the yaw direction... since it is just 'a degree every few seconds' you could try my 'to cheap for gps' idea. I mentioned this before a while ago and am too stubbon (or stupid ;-) to understand why it would not…
Apr 13, 2011
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Simon Wood commented on Jason Dorie's blog post 'Propeller DCM'
If left flat on the table does it maintain correct rotation (on the screen) after a long period of time? If not, what sort of duration does it take to become un-synced and does it self correct when (board is) moved? Simon
Apr 13, 2011
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Simon Wood replied to Noland's discussion 'Realtime DGPS with ublox and GPSTk lib processing, relative <1m?'
Looks like there is also a SkyTraq USB dongle available from a 3rd party: http://www.onetalent-gnss.com/products/usb-hw-receivers/yuan10 Simon
Apr 11, 2011
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Simon Wood replied to Noland's discussion 'Realtime DGPS with ublox and GPSTk lib processing, relative <1m?'
The eval kit is probably your best 'get going quick' solution, a bit pricy at $350 and you'd probably want to get a better antenna (the patch is a bit crappy). At least you don't have to fuss with a 'carrier' PCB and…
Apr 11, 2011
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Simon Wood commented on Jack Crossfire's blog post 'Max2769: RTK GPS for all?'
Remember that RTCM is just a compression scheme for the Psuedorange/Phase/other data, you could just as easily send uBlox binary protocol over a link (of sufficient bandwidth/reliability).   RTKLib does have a future feature of RTCM out... just…
Apr 11, 2011
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Simon Wood replied to Noland's discussion 'Realtime DGPS with ublox and GPSTk lib processing, relative <1m?'
Interesting... would you be forming distance measurements with theodolite or just working from angular measure off the optic/photo's? You may have to carefully calibrate the optics of you system to account for distortion/etc. Once RTK (or post…
Apr 11, 2011
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Simon Wood replied to Noland's discussion 'Realtime DGPS with ublox and GPSTk lib processing, relative <1m?'
Hi Mike, I'm not sure what GCP/SFM stand for... but in order to perform a live RTK or post process you need to record pseudorange/phase data on the either end (rover and base station). If you are lucky enough to have a public base station close…
Apr 10, 2011
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Simon Wood commented on Ken Wycherley's blog post 'Object tracking algorithm learns on the fly.'
I'm confused (and not just the general sense)... the behaviour is that the author did something wrong and is hence trying to back track on publishing source, but the messages are that he's pro-open-sourcing this.   Hidden message…
Apr 6, 2011

Simon Wood's Blog

Simon Wood

A Sensitive DIY Ultrasonic Range Sensor

Posted on January 25, 2011 at 1:30pm 3 Comments

Spotted over on Hack-a-day, would be great on a quadcopter.

http://www.kerrywong.com/2011/01/22/a-sensitive-diy-ultrasonic-range-sensor/

 …

Continue
Simon Wood

Watch out, the Chinese are catching 'us' up... ;-)

Posted on March 24, 2010 at 3:54pm 18 Comments

In the new edition of 'Inside GNSS'.


http://www.insidegnss.com/node/1918
Simon Wood

U.S. Diverts Spy Drone from Afghanistan to Haiti

Posted on January 15, 2010 at 2:00pm 3 Comments

Obviously there is a lot of focus on trying to help out following the Haiti earthquake.



Drones are showing their usefulness:

http://www.wired.com/dangerroom/2010/01/pentagon-shares-earthquake-images-from-high-flying-spy-drone/



Also OpenStreetMap are doing a lot of map tracing from donated aerial photography and making these maps for aid workers on the… Continue

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