"Garrick and I are both civil servants with NASA. He works in the avionics group and I work in our propulsion group. We were given a little bit of play money to go work on UAV's and we do this stuff on the side. We have other people involved…"
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Adam Kimberlin
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Adam Kimberlin's Discussions
GPS Multipath Error
Started this discussion. Last reply by John Bond Mar 16. 2 Replies 0 Likes
We have been running into an issue quite often when flying at certain altitudes and 'near' structures. We are doing autonomous waypoint navigation and all of a sudden the GPS position jumps anywhere…Continue
Tags: gps, interference, multipath
Magnetometer Shielding
Started this discussion. Last reply by Adam Kimberlin Mar 15. 13 Replies 0 Likes
I am sure that some of you have experienced the same issue that we have. We are flying a rather heavy hexacopter configuration which pulls a substantial amount of current just to hover. Due to the…Continue
Tags: sensor, autopilot, magnetometer
Flight Time Optimization
Started this discussion. Last reply by Adam Kimberlin Mar 11. 4 Replies 0 Likes
We attempted a little parametric study to optimize our UAV's flight time using the motors, propellers, and # of batteries as our controllable variables. First we optimized the rotor/motor…Continue
Tags: performance, batteries, optimization
Time-lapse of Multiple UAV Assembly
Started Nov 17, 2012 0 Replies 0 Likes
Tags: diydrones, 3drobotics, uas, uav, hexacopter
Adam Kimberlin's Page
Latest Activity
Adam Kimberlin commented on Garrick Merrill's blog post NASA using ArduCopter"Not to mention we had over 600 people watching. Pucker factor was definitely a 10/10."
Adam Kimberlin replied to Randy's discussion AC 2.9.1 vs 2.8.1 GPS accuracy"
Unfortunately, I won't be there when they test but this is what Garrick and a few others are testing this morning. We will post-process the data when we can and add it to this thread ASAP.
"
John Bond replied to Adam Kimberlin's discussion GPS Multipath Error"It certainly sounds like multipath. It can be mitigated by better antenna design and/or receiver processing which tend to add cost, size, and weight. You don't say what you are flying or the type of GPS and antenna used (and budget)…"
Adam Kimberlin replied to Adam Kimberlin's discussion Magnetometer Shielding"That sounds very likely. I believe that as you move the sheet, you are inducing eddy currents in the Mu-Metal. As you turn the sheet of metal, you are effectively introducing a local, time-changing magnetic field in the sheet which produces the…"
Tom Mahood replied to Adam Kimberlin's discussion Magnetometer Shielding"Well, I received my 5" x 12" piece of Mu Metal and had a very weird experience. I wanted to see how good its shielding was so I put a compass on top of it and was going to bring a neodymium magnet up underneath. I was holding the Mu Metal…"
Bot Thoughts replied to Adam Kimberlin's discussion GPS Multipath Error"I'd bet cash money on multipath interference, too. I've dealt with that on my ground vehicle. I ran into those issues in the 2011 Sparkfun AVC where my SirfIII just couldn't get a decent position fix when driving so close to the…"
Adam Kimberlin posted a discussionGPS Multipath Error
We have been running into an issue quite often when flying at certain altitudes and 'near' structures. We are doing autonomous waypoint navigation and all of a sudden the GPS position jumps anywhere from several feet up to a few hundred feet. Obviously this isn't cool and luckily we have enough people to notice the issue and regain manual control before it does anything too crazy. From what I have seen via some quick research, this could very easily be what is known as…See More
Adam Kimberlin commented on Chris Anderson's blog post DIY Rockets site"I completely agree; however, I am a huge fan of 3D printing and making things open source. I work for NASA in a propulsion research lab and if there is any effort to make propulsion more accessible regardless of the scale, I am all for it."
Adam Kimberlin commented on Chris Anderson's blog post DIY Rockets site"Now this is what I'm talking about. I know one of their 'Team' members, Tim Pickens. He really is an interesting person. He and a few others built a rocket propelled truck using roofing tar and nitrous oxide (I think) with a Xbox…"
Tom Mahood replied to Adam Kimberlin's discussion Magnetometer Shielding"It's also available in small quantities from aircraft supply houses where it's used to shield magnetic compasses from other stuff in an aircraft's instrument panel. Here's one such place. Also Aircraft Spruce…"
Adam Kimberlin replied to Adam Kimberlin's discussion Magnetometer Shielding"Wow... that was one of those moments where I knew what I wanted to type but somehow I typed the wrong thing. My bad!"
Garrick Merrill replied to Adam Kimberlin's discussion Magnetometer Shielding"Quick correction to Adam's last comment, we're using the integrated magnetometer on an APM 2.5. We placed our Mu-metal shield on the bottom of the fiberglass plate that sits between the APM and the power distribution board on the 3DR…"
Adam Kimberlin replied to Adam Kimberlin's discussion Magnetometer Shielding"Where is your noise showing up from your ESC?"
Peter Miller replied to Adam Kimberlin's discussion Magnetometer Shielding"Thanks for the information. I had been working with the mesh to shield ESC noise. I am just now starting to work on magnetic. Again, thank you for the information!
Peter"
Profile Information
- About Me:
- I am a propulsion research and development engineer for NASA-Marshall Space Flight Center. I work on a wide range of propulsion systems from large solid and liquid rocket motors to in space plasma thrusters.
My primary strengths are software development, simulation, and test. I am also involved with design and analysis of various systems.
- Tell us a bit about your UAV interest
- I am interested in all things UAV related. I have a pretty standard educational background that leans towards software development, turbomachinery, control theory, and supersonic flow.
- Hometown:
- Etowah, TN
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Season Two of the Trust Time Trial (T3) Contest has now begun. The fourth round is an accuracy round for multicopters, which requires contestants to fly a cube. The deadline is April 14th.A list of all T3 contests is here.
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