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Triangulation using RF

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moinkey

New Member
Hi All,

I've been reading the forum and its great!

However im still having troubles understanding exactly how RF triangulation works and how i would implement it. I'll explain my project im planning to do and what i plan to achieve.

Basically there is a user and a robot. The user wear a 'tag' and the robot has 2/3/4 sensors or receivers that triangulate the position of the user and move towards the user. So when the user walks the robot follows giving a fairly poor resolution of +-30cm and the user will be no further than 5m away.

There arent a lot of restrictions on the receiver side besides that it cant kill the battery too quickly. Having said that the battery will probably have a fairly large capacity. Something like wifi is prob too power consuming.

The tag should be a small box running off AAA batteries or a 9V battery.

After doing some research i believe some sort of RF would be the best choice as the environment is outdoors and there may not always be line of site.

Are there any projects/devices that have already done this that i could reference to. If not then is it possible to get a high level schematic of how this would work and what i would need to prototype this?

Thanks in advance.

Moinkey
 

transistance

New Member
An RF tracker can do what you are looking for. Here is a link to a FM Tracking Transmitter. (Stalk much?)

You can code your robot to act more intelligent to be able to find the source with 1 receiver (this would not be triangulation in the real sense), or use 2 receivers placed apart to pinpoint the source of transmission. You will not need a third receiver or more unless you have a flying robot that moves in three dimensional space.
 
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Mr RB

Well-Known Member

transistance

New Member
it's not my website; it's a site I came across by googling. I just tried it and it still works.
 

Sceadwian

Banned
What's the range you're looking for?
 

moinkey

New Member
Thanks for the response transistance. Your link works fine for me and seems to be a good little device.

The range im looking for is no more than 10m. 5metres is OK too. Resolution of about 30-50 cm. Basically i would like to robot to follow. As long as its going the right direction and is a couple of steps behind me then its good enough.

Cheers
 

new_member

New Member
Hi, very intresting topic!!
Id like to read more about this, but the link is broken. maybe sombody out there could provide me with new links about this whole "robotor following people topic"

i appriciate it
 

MikeMl

Well-Known Member
Most Helpful Member
RF is almost useless at these dimensions. Use Ultrasound at about 40kHz to 100kHz.
 

Sceadwian

Banned
What do you mean using RF? The video shows and says that it's using ultrasonic sensors. Nice project though, I like the gimbals.
 

ericgibbs

Well-Known Member
Most Helpful Member
What do you mean using RF? The video shows and says that it's using ultrasonic sensors. Nice project though, I like the gimbals.
hi,
I also thought he said it was ultrasonic.
Ref the gimbals, I would just a taller [deeper] trash can for the rubbish.:)
 

Sceadwian

Banned
Yeah me too eric, but I didn't want criticize the design too much =\ It worked, and I have a fascination with gimbals =)
 
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