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AdminPermalink Reply by Thomas J Coyle III on August 24, 2011 at 4:24am

Zeeshan,

The IMU provides platform stability in Pitch, Yaw, and Roll. The GPS obviously cannot do that.

Just a thought.

Regards,

TCIII

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Permalink Reply by Zeeshan Haider on August 24, 2011 at 6:28am

Thank you for your help thomas, i understood the role of GPS and IMU but, what i want to know is that, is it necessary to use IMU with GPS for simple waypoint following autopilot system. i dont want autopilot system to add features like height lock, level lock, pitch adjustment etc. i just my UAV to follow waypoints with rudder control.

 

Hope U got wat i want to ask !

 

Regards

Z-shan

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Permalink Reply by Don Cramer on August 24, 2011 at 7:08am

Some OSD's work this way using only a GPS... You would need a plane that 'self levels' (wing has enough Dihedral, etc), rudder control and i would not even attempt it without some sort of pitch control. The plane would need to maintain altitude to successfully run any type of mission.

 

This should work out well in most conditions... But windy days, etc.. would also require aileron control for somewhat stable flight (just MY opinion).

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Permalink Reply by Jeff E on August 24, 2011 at 7:06am

Zeeshan I am no expert and I may be wrong but I think you missed the point of Thomas.

 

True GPS will give you the vector heading, alt with respect to sea level, long. and lat all about the physical location of your UAV but it will not give you the orientation of the UAV. your UAV can be locked by GPS but it might me upside down. IMU will help correct/align you UAV with horizon i.e pitch/yaw/roll your navigation will be dependent on your orientation. Think of it this way GPS unit in a car is the GPS on UAV and IMU is the driver of the car in a sense that he know where he is heading and if the car is pointed to that as well as when to put the pedal. (worst comparision but I think you can relate). I think what this means is that they work hand in hand. Again I am no expert

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Permalink Reply by Akshay Verma on September 16, 2011 at 5:07am

Hi Zeeshan,

Can you send me some links or PDF of the thesis about building autopilot systems?

Regards,

Akshay

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Permalink Reply by Zeeshan Haider on December 7, 2011 at 5:58am

you can google autopilot system and you will find dozens of project reports, thesis etc
i will send you some pdf files if you tell me your email adress.
regards
zeeshan haider

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Permalink Reply by Akshay Verma on December 7, 2011 at 7:24am

veraks18@gmail.com

Thanks for the help!!!

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