measure distance between two objects in house

hi,
i need to measure the distance between tow arduino boards in hose ->so gps not relevant.
the two object are not static and will move from place to place so ultrasonic and ir are not relevant as well.

the most reasonable solution i can think of its rf, but can't find any direction on google how to do it.
some one can give me direction or other solution ?

tnx ...

moderatore: edited title

A hose is a flexible tube that water goes through when you need to water your flower bed. What word did you mean to type?

...R

Robin2 , i didn't understand what you saying...

The subject of your thread...

measure distance between two objects in hose

"House" perhaps?

sorry my bad ..
i meant in-house / in-doors

May be you can try this pozyx system

With the use of ultra-wideband technology, it is possible to achieve indoor 3D positioning with centimeter accuracy.

PS:
Also read this
Indoor Positioning system using Arduino
http://forum.arduino.cc/index.php?topic=248811.0

Hi NillaHO it's exactly what i'm looking for!!
were can i buy it ? or some other solution like it ...

need the cheapest solution ....

If there is cheapest solution for this problem, then you can find it in China eBay product list.

You can't find it because it had no cheapest solution for this problem.

hi ,
the cheapest pozyx system cost 200 euros
is there any other way ??

I am not even sure that the pozyx works as it is not out yet.

is there any other way

Not that are cheaper and that work.

so how Quadcopter like Galaxy Visitor works.
the Quadcopter know where is your position in-door and out-door
and how can i build something like it ... ?

the most reasonable solution i can think of its rf, but can't find any direction on google how to do it.

Natures warning sign.