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119 lines
3.1 KiB
C++
119 lines
3.1 KiB
C++
/* -*- Mode:C++; c-file-style:"gnu"; indent-tabs-mode:nil; -*- */
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/*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation;
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*
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* Author: Tim Schubert <ns-3-leo@timschubert.net>
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*/
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#include "ns3/log.h"
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#include "ns3/mobility-model.h"
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#include "ns3/double.h"
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#include "math.h"
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#include "isl-propagation-loss-model.h"
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namespace ns3 {
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NS_LOG_COMPONENT_DEFINE ("IslPropagationLossModel");
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NS_OBJECT_ENSURE_REGISTERED (IslPropagationLossModel);
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TypeId
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IslPropagationLossModel::GetTypeId (void)
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{
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static TypeId tid = TypeId ("ns3::IslPropagationLossModel")
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.SetParent<PropagationLossModel> ()
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.SetGroupName ("Leo")
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.AddConstructor<IslPropagationLossModel> ()
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;
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return tid;
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}
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IslPropagationLossModel::IslPropagationLossModel ()
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{
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}
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IslPropagationLossModel::~IslPropagationLossModel ()
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{
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}
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bool
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IslPropagationLossModel::GetLos (Ptr<MobilityModel> moda, Ptr<MobilityModel> modb)
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{
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// origin of LOS
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Vector3D apos = moda->GetPosition ();
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Vector3D bpos = modb->GetPosition ();
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// select upper satellite as origin
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Vector oc = apos.GetLength () > bpos.GetLength () ? apos : bpos;
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Vector bp = apos.GetLength () > bpos.GetLength () ? bpos : apos;
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Vector3D u = bp - oc;
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// distance from s1 to s2
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double s2 = u.GetLength ();
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// direction unit vector
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u = Vector3D (u.x / s2, u.y / s2, u.z / s2);
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double a = u.x*u.x + u.y*u.y + u.z*u.z;
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double b = 2.0 * (oc.x*u.x + oc.y*u.y + oc.z*u.z);
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double c = (oc.x*oc.x + oc.y*oc.y + oc.z*oc.z) - (LEO_EARTH_RAD*LEO_EARTH_RAD);
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double discriminant = b*b - 4*a*c;
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NS_LOG_DEBUG ("a_pos="<<moda->GetPosition ()<<";b_pos"<<modb->GetPosition ()
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<<";u="<<u
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<<";a="<<a
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<<";b="<<b
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<<";c="<<c
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<<";disc="<<discriminant);
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if (discriminant < 0)
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{
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return true;
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}
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else
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{
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// distances from oc (first sat)
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double t1 = (-b - sqrt (discriminant)) / (2.0 * a);
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double t2 = (-b + sqrt (discriminant)) / (2.0 * a);
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NS_LOG_DEBUG ("t1="<<t1
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<<"t2="<<t2
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<<"s2="<<s2);
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// check if second sat is behind earth
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return (s2 < abs (t1) && s2 < abs (t2));
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}
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}
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double
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IslPropagationLossModel::DoCalcRxPower (double txPowerDbm,
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Ptr<MobilityModel> a,
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Ptr<MobilityModel> b) const
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{
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NS_LOG_FUNCTION (this << txPowerDbm << a << b);
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if (!GetLos (a, b))
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{
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return -1000.0;
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}
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return txPowerDbm;
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}
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int64_t
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IslPropagationLossModel::DoAssignStreams (int64_t stream)
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{
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return 0;
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}
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};
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