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Hi Weigang,

    You are right. You cant change the transmission range from the TCL file because it is set to a default value in the underwaterpropagation.cc. You will find the following command in the beginning of underwaterchannel.cc.

double UnderwaterChannel::distCST_ =1150.0;

It need not be 1150 in your version of Aqua-Sim, still the value given here is  the transmission range used.
So, if you want to change the transmission range, change it in underwaterchannel.cc.
Please dont forget to compile it once you have modified the .cc file (make clean, make, make install).

Hope your problem is solved.

Regarding the noise parameters in underwaterpropagation.cc, this module just implements the Thorp's propagation model, noise does not come into picture in it.

Regards,
Jalaja M J
Research Scholar, NIT Calicut, India 



     


On Mon, May 16, 2016 at 8:31 PM, Weigang Bai <[log in to unmask]> wrote:
hi,
  I have some questions about aqua-sim,can anyone help me ?
  1. In file underwaterpropagation.cc,  there are no ambient nosie parameters?  
  2. If i want to change the communication range, I can just change the Pt_ and RXThresh?
  3. In the paper 'An NS-2 Based Simulator for Underwater Sensor Netwotks', the author say that 'Aqua-Sim provides users two ways to determine the transmission range:
one way is to set the transmission power and the threshold of received power level; and the other way is to set the transmission range directly.' but I have not found the second way.
Although the parameter opt(range) is used in vbf_example_5.tcl, the parameter opt(range) have not been called though the  whole program.
4. In the  file of vbf_example_5.tcl, the parameter control_packet_size is not belong to vectorbasedforward.cc , it should be in vectorbasedvoidavoidance.cc?
5. I can not understand the grammar set rt [$node_(0) set ragent_ ] in vbf_example_5.tcl?

 Thanks for everyone!
 Best wishes! 


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