How to drive 2 servos (Pan / Tilt) from GPS

[garris2]

Hi, does anyone have or know of a circuit or device that can drive 2 servos set in Pan / Tilt configuration from received GPS data sent over a radio link such that an antenna mounted on the pan / tilt will point to and track the GPS flying along in an RC aeroplane.

cheers Geoff

[AndyOne]

garris2,

Look in the FPV and UAV forums ( http://www.rcgroups.com/video-piloting-fpv-rpv-469/ and http://www.rcgroups.com/uav-unmanned-aerial-vehicles-238/ ) they have a lot of information on GPS and navigation,
You would need to modify a rudder return system which normally steers the plane towards a particular waypoint and connect the pan servo, as for the tilt you would need the altitude and attitude of the plane in order to calculate this one. What you want may have already been done.

Andy.

[Peter Seddon]

Try http://www.rcgroups.com/forums/showthread.php?t=959889

regards Peter

[garris2]

Thanks for the reply Andy, Ive already read entirely those forums. Yes they have lots of info but nothing that can directly help me with what I want to do.
Anyway I don't think you've understood my question at all, I dont want to move the rudder, I want to move an antenna mounted on a tripod on the ground. Eloborate further If I don't get something.

Peter, yes thats what I want to do, Iv'e already seen it, its not available now and one will have to buy the OSD part as well but I already have an OSD I am very happy with.

[TMorita]

..
Anyway I don't think you've understood my question at all, I dont want to move the rudder, I want to move an antenna mounted on a tripod on the ground. Eloborate further If I don't get something.
...


Yes, he knows you don't want to move the rudder.

Given two points P1 and P2, you want to figure out the direction of P2 relative to P1. In the rudder case, the position of P1 is dynamic and the position of P2 is static. In the tripod case, the position of P1 is static, and P2 is dynamic. But it's a similar problem, except there's no feedback in the 2nd case.

Toshi

[garris2]

Thanks for the insight Toshi, Actually I understand the concept of P2 being dynamic and P1 being static. The thing is, you've offered nothing to actually help me achive a result. Andys last sentance is a blinding insight too, quote What you want may have already been done. unquote. Thats why I'm asking the question here, to see if there is anybody that may have already done what I want. What I'm looking for is someone that can help with actual hardware and software that has previously had actual experience with this type of thing. Not a bunch of people that have never done it before but want to reply with mindless offerings.

cheers Geoff

[AndyOne]

..Andys last sentance is a blinding insight too, quote What you want may have already been done. unquote...

No attempt at insight just a get-out clause because I haven't read all of both of those threads.

Andy.

[garris2]

lol