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Aerial Photography and Video > IMU for stabilization
 
 
GeorgeM
Senior Heliman
Location: Europe

My Posts This: Topic  Forum

10-02-2009 09:20 AM
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daytonabeach
Elite Veteran
Location: Oslo, Norway

My Posts This: Topic  Forum
Quote 
"It's gettin' hot in here...
so take off all your...."

Shirts?

Never argue with an idiot, he'll drag you down to his level and beat you with experience...
10-02-2009 09:24 AM
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PaulGT3
Senior Heliman
Location: Mammoth Lakes Ca

My Posts This: Topic  Forum		Came late to this topic Great stuff George!!
I worked on a professional version of this for the US NAVY. We were trying to build a 1 inch by 1 inch IMU for missile instrumentation.
Using GPS too. THe project was called JAMI.
I have just got into RC helo's and I have been thinking about this
MEMS based IMU stuff since then. To keep me from crashing. We were going to use it for real time instrumentation of missiles and G loads that will be much higher than the RC helos will see. THe gyro drift was in the 1 degree per minute range and just too much for what we were doing. We used the GPS to give heading updates to the IMUS to correct drift. But the GPS was another issue. (lil itty bittys and update rates)
I did the software that did the real time differential GPS position on our monitors from the telemetry from the missiles.
George if there is anything I can do to help PM me. I havent read the whole thread yet. But guys realize building the smaller IMU is the holy grail of navigation. Its hard to do. many proposed IMUS have fallen through the cracks. Keep it up George!!!
I am just looking for something to help me train till I get good enough to fly by myself.
10-06-2009 05:09 AM
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daytonabeach
Elite Veteran
Location: Oslo, Norway

My Posts This: Topic  Forum		Looks like the US navy needs a guy like George

Never argue with an idiot, he'll drag you down to his level and beat you with experience...
10-06-2009 06:14 AM
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bvmbandit
Heliman
Location: Newnan, GA

My Posts This: Topic  Forum		IMU

Did I just read some good news about the upcoming project? Price and availability?

Scott
10-15-2009 04:06 AM
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GeorgeM
Senior Heliman
Location: Europe

My Posts This: Topic  Forum		PM Sent
10-15-2009 05:50 AM
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DKTek
Veteran
Location: Melbourne, FL-USA

My Posts This: Topic  Forum		George, what's the latest on your project? I'm looking at the DJI for the heli but it doesn't support a 4 servo heli and a gimbal. I want your system for the gimbal.

The beatings will continue until morale improves...
10-29-2009 06:07 PM
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GeorgeM
Senior Heliman
Location: Europe

My Posts This: Topic  Forum		@DKTek..

not sure which one to believe...
in the other thread you just said .. quote..

"Pretty much says it all.... My 2.5 meter turbine machines are getting the DJI." unquote ...

10-29-2009 06:15 PM
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PaulGT3
Senior Heliman
Location: Mammoth Lakes Ca

My Posts This: Topic  Forum		George I may be going back to the Navigation area of work.
Its where we test IMUs rate sensors and accelerometers
Like I said if you need anything let me know.
10-29-2009 06:39 PM
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DKTek
Veteran
Location: Melbourne, FL-USA

My Posts This: Topic  Forum		LOL, yes that's correct. The DJI for the heli and yours for the 3 axis gimbal. Two seperate systems, same machine...unless I'm misunderstanding the use of your system.

The beatings will continue until morale improves...
10-29-2009 08:08 PM
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GeorgeM
Senior Heliman
Location: Europe

My Posts This: Topic  Forum		@DKTek... LOL.. now I see that I misunderstood your post.
10-29-2009 08:45 PM
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BarryB
Senior Heliman
Location: Germany

My Posts This: Topic  Forum		Even if it could drive the servos, the DJI cannot stabilise a gimbal which has pan. Only tilt and roll when pointing forwards.

They should stop calling it 'Pan and Tilt'.
10-29-2009 09:32 PM
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GeorgeM
Senior Heliman
Location: Europe

My Posts This: Topic  Forum		@Barry,

You mean that it does not do back compensation for tilt and roll when the mount is looking sideways.

If I remember correctly CARVEC does this compensation.
10-29-2009 09:57 PM
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BarryB
Senior Heliman
Location: Germany

My Posts This: Topic  Forum		That's right : tilt and roll pointing straight ahead is the easy part. It gets difficult when the IMU is static but the mount can pan.

The rep should be more open about this : it won't work on any mount with pan - even if you don't connect the pan to the DJI. Once you point it sideways, the pitch and roll stabilisation will be completely wrong.

I saw the algorithms for an airborne laser designator pod and they are mind blowing.
10-30-2009 08:09 AM
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GeorgeM
Senior Heliman
Location: Europe

My Posts This: Topic  Forum		Wow!! JC is such a genius to have done it (along with the other harder stuff so long ago.
10-30-2009 09:00 AM
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kurgan
Heliman
Location: Croatia

My Posts This: Topic  Forum		hi all, and respect to you George
I've been following this post since the start but still dont see any reviews on this IMU. Is it out and stabilizing some cameras or what?
Can anyone compare it to the TRIAX CSM made by Derek?
http://www.triax-aerial.com/triax/products.html
We have a modified version of TRIAXlite AV/AP platform, (www.helifoto.hr) and tested it with many gyro/servo/machanics combinations.
I think this is what we need.

Davor
www.helifoto.hr

there can be only one
11-14-2009 06:46 PM
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DKTek
Veteran
Location: Melbourne, FL-USA

My Posts This: Topic  Forum		http://www.st.com/stonline/stappl/c...r2009/p2440.htm

interesting...

The beatings will continue until morale improves...
11-23-2009 08:54 PM
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