[ns] Is antenna position relative to node position?

[Leyond]

Hi,
   I want to calculate the value of received signal strength, so I need to
know the position of Mobile Node and Access Point. And I found something
interesting in the file mobile/propagation.cc
   Xr += r->getAntenna()->getX();
	Yr += r->getAntenna()->getY();
	Zr += r->getAntenna()->getZ();
	Xt += t->getAntenna()->getX();
	Yt += t->getAntenna()->getY();
	Zt += t->getAntenna()->getZ();
 And I print out these values :

Xt 589.478206: Yt 489.478206,Zt 0.250000:Xr 589.478206,Yr 489.478206:Zr
0.250000

Xt 600.000000: Yt 500.000000,Zt 0.250000:Xr 600.000000,Yr 500.000000:Zr
0.250000

Xt 589.487894: Yt 489.487894,Zt 0.250000:Xr 589.487894,Yr 489.487894:Zr
0.250000

Xt 620.503211: Yt 520.503211,Zt 0.250000:Xr 620.503211,Yr 520.503211:Zr
0.250000
.....
To my surprise is that the values of Xt,Yt are variant which are supposed to
be invariable because the AP is fixed. So, How to explain  these codes? Is
antenna position relative to node position?
Thanks very much
Leyond


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