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Doug Weibel
  • Male
  • Longmont, CO
  • United States
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Doug Weibel's Groups

Doug Weibel's Discussions

APMega - 1.0.1 alpha now in the repository

Started this discussion. Last reply by Uwe Gartmann Aug 16, 2010. 19 Replies

ArduPilot Firmware Version 2.6

Started this discussion. Last reply by Ground Loop Oct 8, 2010. 244 Replies

SuperStar EP Power System questions

Started this discussion. Last reply by Doug Weibel Aug 5, 2009. 3 Replies

 

Doug Weibel's Page

Latest Activity


Developer
Doug Weibel commented on Chris Anderson's blog post ADS-B for Dronecode-based platforms (Solo, Pixhawk etc)
"Looks like a nice product that works towards airspace integration but please keep the marketing hype in check:  "able to detect all aircraft threats within a 30 statue mile radius in real time".  Really?  ADS-B Out is not…"
Feb 24

Developer
Doug Weibel replied to Martin's discussion Extending logging time in the group ArduPlane User Group
"There is no Attitude Slow.  If you set both to zero you will get Attitude NO, meaning no attitude data will be logged.  This may be OK, depending on what you want, and will certainly extend the logging time."
Nov 18, 2014
Max van Daalen commented on Doug Weibel's blog post Proof of Concept test - Extremely accurate 3D velocity measurement with a ublox 6T module.
"Thanks Doug! I've wrestled with Allan variance in the past when deciphering gyro data sheets, hopefully it won't come to that again. Assuming I can get all of this working, I'll try it with both parts. I'd like to use the -P…"
Aug 19, 2014

Developer
Doug Weibel commented on Doug Weibel's blog post Proof of Concept test - Extremely accurate 3D velocity measurement with a ublox 6T module.
"It could affect the pseudo range, Doppler and carrier phase measurements , but the extent to which it would I don't know.  Velocity measurement assumes there is a drift rate in the RX clock.  If the regular XO clock drift is nicely…"
Aug 18, 2014

Developer
Doug Weibel commented on Doug Weibel's blog post Proof of Concept test - Extremely accurate 3D velocity measurement with a ublox 6T module.
"It could affect the pseudo range, Doppler and carrier phase measurements , but the extent to which it would I don't know.  Velocity measurement assumes there is a drift rate in the RX clock.  If the regular XO clock drift is nicely…"
Aug 18, 2014
Max van Daalen commented on Doug Weibel's blog post Proof of Concept test - Extremely accurate 3D velocity measurement with a ublox 6T module.
"Hi Doug, I just realized that the NEO-7P doesn't have the more stable TCXO oscillator as found in the -T parts. Do you have any idea if this will affect the measurement of the carrier phase? As my order hasn't shipped I'm…"
Aug 18, 2014
Max van Daalen commented on Doug Weibel's blog post Proof of Concept test - Extremely accurate 3D velocity measurement with a ublox 6T module.
"Many thanks Doug! That makes sense and doesn't sound so bad. The acceleration aspect you mentioned is interesting, hopefully for my application it's not going to be a problem as I'm just intending to use the approach to maintain…"
Aug 17, 2014

Developer
Doug Weibel commented on Doug Weibel's blog post Proof of Concept test - Extremely accurate 3D velocity measurement with a ublox 6T module.
"Hello Max, At each measurement epoch the receiver clock error is modeled as a fixed drift rate (s/s).  This is all that is possible/needed as the velocity solution is a least squares calculation using data from a single measurement…"
Aug 17, 2014
Max van Daalen commented on Doug Weibel's blog post Proof of Concept test - Extremely accurate 3D velocity measurement with a ublox 6T module.
"Doug, do you have any further details that you can share on how you modeled the receiver clock errors in your calculation? I ask as I'm just about to have a go at recreating your experiment. I'm doing this for mostly for fun but…"
Aug 15, 2014

Developer
Doug Weibel commented on Roger Sollenberger's blog post Dronecon 2014 Call for Submissions!
"Serious?  DroneCon is not before/after AVC???"
May 13, 2014

Developer
Doug Weibel commented on Nick Arsov's blog post AUAV-X1 , a new vision of the PX4 autopilot
"I have configured the SP0 pin per the data sheet for the next-to-LSb to be zero and have tried 0xB0 and 0xB1 in accordance with the data sheet which may of course be wrong.  I can set up to just bang all the addresses and look for a response…"
Mar 18, 2014

Developer
Doug Weibel commented on Nick Arsov's blog post AUAV-X1 , a new vision of the PX4 autopilot
"Hi Nick, The files you uploaded are for the 21000 series devices, which are 2 axis devices, versus the 21100 series devices which are 6+3 axis devices.  Although there are some similarities there are very significant differences.  Is…"
Mar 18, 2014

Developer
Doug Weibel commented on Nick Arsov's blog post AUAV-X1 , a new vision of the PX4 autopilot
"Does anybody have any actual experience with the Maxim21100?  I have a couple sample parts but thus far have not been able to get anything out of them.  Of course the data sheet doesn't help - it is missing all the register bitfield…"
Mar 18, 2014

Developer
Doug Weibel commented on Paul's blog post Soon we can mint our own carbon prop ? frame ?
"Hi Robert, Seems like that is just a programming issue to me.  Why can't it lay one layer down pulling the fiber left/right and the next layer pulling the fiber front/back?  I think weave is mostly just a convenience as you can handle…"
Jan 29, 2014

Developer
Doug Weibel commented on Thomas J Coyle III's blog post The Sparkfun 2014 AVC has been announced!
"OK Robert, I'll be twisting Peter's arm to come up with something for the plane course that will take at least an hour, maybe 2 hours - 30 or 40 laps of the reservoir perhaps? :)  Then we will see…  I'll start…"
Nov 20, 2013
Dan Doberstein commented on Doug Weibel's blog post Proof of Concept test - Extremely accurate 3D velocity measurement with a ublox 6T module.
"from above , Dougs comment "- conceptually Doppler measurements and carrier phase change measurements are the same, but the way they are made in a gps receiver is very different." I am not an expert in the measurement of doppler in GPS…"
Oct 3, 2013

Profile Information

About Me:
UAS researcher at the University of Colorado, Boulder
Full scale plane and sailplane pilot
RC plane and heli pilot
Please tell us a bit about your UAV interest
UAS as scientific research measurement platforms.
High accuracy state estimation using low cost sensors.
Hometown:
Colorado

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Doug Weibel's Blog

Proof of Concept test - Extremely accurate 3D velocity measurement with a ublox 6T module.

Posted on December 2, 2012 at 5:30pm 31 Comments

 

When the ublox 6 series modules were released, I noted that the 6T and 6P modules provided access to the raw carrier phase measurements, and I started thinking about how to use this capability.  My connections through my university research appointment weren't strong enough to get ublox to sample a dev kit to me (they generally don't sample them at all).  Jordi and Chris from 3DRobotics.com were kind enough to use…

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Annual Public Service Announcement

Posted on October 19, 2012 at 4:28pm 1 Comment

It is that time of the year when for many of us the furnaces have been turned on for the coming winter and the indoor air is getting dry, so it must be time for my annual ESD Public Service Announcement.

 

What is ESD?  Electrostatic Discharge!  That little spark you sometimes get when you touch a…

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Lemon-RX UART and PPM output

Posted on October 19, 2012 at 4:17pm 5 Comments

I have had a Lemon-RX (previously known as Orange-RX) DSM2 6-Channel Receiver (PPM + UART)

sitting around for a bit, and finally got around to hooking it up to my logic analyzer and checking it out today.  I was interested in this RX as an inexpensive option if you need PPM output and run Spektrum/JR gear.  I knew from the spec sheet that the channel resolution on…

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Best Quads doing stuff video

Posted on March 21, 2012 at 10:00am 2 Comments

In response to Chris' post of the best AP video ever, I have this offering

Difficulty with using Ultrasonic Ranging (Sonar) for landing flare control.

Posted on January 29, 2012 at 1:30pm 51 Comments

A feature frequently requested is to add support to ArduPlane for using sonar to control the landing flare.The answer, unfortunately, is probably no.  Take a look at this graph I obtained yesterday...

This has been on my to-do list for ages as I have never gotten around to getting some real world…

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