uan-noise-model-default.cc

Go to the documentation of this file.

/* -*- Mode:C++; c-file-style:"gnu"; indent-tabs-mode:nil; -*- */
/*
 * Copyright (c) 2009 University of Washington
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation;
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 *
 * Author: Leonard Tracy <lentracy@gmail.com>
 */
 
#include "uan-noise-model-default.h"
#include "ns3/double.h"
 
#include <cmath>
 
namespace ns3 {
 
NS_OBJECT_ENSURE_REGISTERED (UanNoiseModelDefault);
 
UanNoiseModelDefault::UanNoiseModelDefault ()
{
 
}
 
UanNoiseModelDefault::~UanNoiseModelDefault ()
{
}
 
TypeId
UanNoiseModelDefault::GetTypeId (void)
{
  static TypeId tid = TypeId ("ns3::UanNoiseModelDefault")
    .SetParent<UanNoiseModel> ()
    .SetGroupName ("Uan")
    .AddConstructor<UanNoiseModelDefault> ()
    .AddAttribute ("Wind", "Wind speed in m/s.",
                   DoubleValue (1),
                   MakeDoubleAccessor (&UanNoiseModelDefault::m_wind),
                   MakeDoubleChecker<double> (0))
    .AddAttribute ("Shipping", "Shipping contribution to noise between 0 and 1.",
                   DoubleValue (0),
                   MakeDoubleAccessor (&UanNoiseModelDefault::m_shipping),
                   MakeDoubleChecker<double> (0,1))
  ;
  return tid;
}
 
// Common acoustic noise formulas.  These can be found
// in "Priniciples of Underwater Sound" by Robert J. Urick
double
UanNoiseModelDefault::GetNoiseDbHz (double fKhz) const
{
  double turb, wind, ship, thermal;
  double turbDb, windDb, shipDb, thermalDb, noiseDb;
 
  turbDb = 17.0 - 30.0 * std::log10 (fKhz);
  turb = std::pow (10.0, turbDb * 0.1);
 
  shipDb = 40.0 + 20.0 * (m_shipping - 0.5) + 26.0 * std::log10 (fKhz) - 60.0 * std::log10 (fKhz + 0.03);
  ship = std::pow (10.0, (shipDb * 0.1));
 
  windDb = 50.0 + 7.5 * std::pow (m_wind, 0.5) + 20.0 * std::log10 (fKhz) - 40.0 * std::log10 (fKhz + 0.4);
  wind = std::pow (10.0, windDb * 0.1);
 
  thermalDb = -15 + 20 * std::log10 (fKhz);
  thermal = std::pow (10, thermalDb * 0.1);
 
  noiseDb = 10 * std::log10 (turb + ship + wind + thermal);
 
  return noiseDb;
}
 
} // namespace ns3