mirror of
https://gitlab.ibr.cs.tu-bs.de/tschuber/ns-3-leo.git
synced 2025-06-08 10:03:58 +02:00
102 lines
2.5 KiB
C++
102 lines
2.5 KiB
C++
/* -*- Mode:C++; c-file-style:"gnu"; indent-tabs-mode:nil; -*- */
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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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.AddAttribute ("MaxDistance",
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"Cut-off distance for signal propagation",
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DoubleValue (2000.0),
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MakeDoubleAccessor (&IslPropagationLossModel::SetCutoffDistance,
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&IslPropagationLossModel::GetCutoffDistance),
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MakeDoubleChecker<double> ())
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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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// TODO get max distance with line-sphere intersection
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// origin of LOS
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Vector3D oc = moda->GetPosition ();
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Vector3D bp = modb->GetPosition ();
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// direction unit vector
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Vector3D u = Vector3D (bp.x - oc.x, bp.y - oc.y, bp.z - oc.z);
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u = Vector3D (u.x / u.GetLength (), u.y / u.GetLength (), u.z / u.GetLength ());
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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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return discriminant < 0;
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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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if (a->GetDistanceFrom (b) > m_cutoffDistance || !GetLos (a, b))
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{
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NS_LOG_DEBUG ("DROP;"<<a->GetPosition ()<<";"<<b->GetPosition ());
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return -1000.0;
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}
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NS_LOG_DEBUG ("LOS;"<<a->GetPosition ()<<";"<<b->GetPosition ());
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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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void
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IslPropagationLossModel::SetCutoffDistance (double d)
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{
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m_cutoffDistance = d * 1000.0;
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}
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double
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IslPropagationLossModel::GetCutoffDistance () const
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{
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return m_cutoffDistance / 1000.0;
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}
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};
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