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Fix LEO propagation loss

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This commit is contained in:
Tim Schubert 2020-08-19 11:39:02 +02:00
parent a92c54703f
commit ad22221f42
6 changed files with 65 additions and 28 deletions
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49
model/leo-propagation-loss-model.cc
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@ -23,13 +23,15 @@ LeoPropagationLossModel::GetTypeId (void)
.AddConstructor<LeoPropagationLossModel> ()
.AddAttribute ("MaxDistance",
"Cut-off distance for signal propagation",
DoubleValue (1000000.0),
MakeDoubleAccessor (&LeoPropagationLossModel::m_cutoffDistance),
DoubleValue (3000),
MakeDoubleAccessor (&LeoPropagationLossModel::SetCutoffDistance,
&LeoPropagationLossModel::GetCutoffDistance),
MakeDoubleChecker<double> ())
.AddAttribute ("ElevationAngle",
"Cut-off angle for signal propagation",
DoubleValue (M_PI / 9),
MakeDoubleAccessor (&LeoPropagationLossModel::m_elevationAngle),
MakeDoubleAccessor (&LeoPropagationLossModel::SetElevationAngle,
&LeoPropagationLossModel::GetElevationAngle),
MakeDoubleChecker<double> ())
.AddAttribute ("AtmosphericLoss",
"Atmospheric loss due to attenuation in dB",
@ -71,21 +73,56 @@ LeoPropagationLossModel::GetAngle (Ptr<MobilityModel> a, Ptr<MobilityModel> b)
return acos (prod / norm);
}
void
LeoPropagationLossModel::SetElevationAngle (double angle)
{
m_elevationAngle = angle * (M_PI/180.0);
}
double
LeoPropagationLossModel::GetElevationAngle () const
{
return m_elevationAngle * (180.0/M_PI);
}
void
LeoPropagationLossModel::SetCutoffDistance (double d)
{
m_cutoffDistance = d * 1000.0;
}
double
LeoPropagationLossModel::GetCutoffDistance () const
{
return m_cutoffDistance / 1000.0;
}
double
LeoPropagationLossModel::DoCalcRxPower (double txPowerDbm,
Ptr<MobilityModel> a,
Ptr<MobilityModel> b) const
{
if (a->GetDistanceFrom (b) > m_cutoffDistance || GetAngle (a, b) > m_elevationAngle / 2.0)
double distance = a->GetDistanceFrom (b);
double angle = GetAngle (a, b);
double rxc = txPowerDbm - m_atmosphericLoss - m_freeSpacePathLoss - m_linkMargin;
NS_LOG_DEBUG ("LEO propagation: a=" << a->GetPosition () << " b=" << b->GetPosition () << " m_cutOff="<<m_cutoffDistance<<" m_angle="<<m_elevationAngle<<" dist=" << distance << "angle=" << angle << "rxc=" << rxc);
if (distance > m_cutoffDistance)
{
NS_LOG_DEBUG ("LEO DROP DISTANCE: " << distance);
return -1000.0;
}
if (angle > m_elevationAngle / 2.0)
{
NS_LOG_DEBUG ("LEO DROP ANGLE: " << angle <<"; " << distance);
return -1000.0;
}
// txPowerDbm includes tx antenna gain and losses
// receiver loss and gain added at net device
// P_{RX} = P_{TX} + G_{TX} - L_{TX} - L_{FS} - L_M + G_{RX} - L_{RX}
double rxc = txPowerDbm - m_atmosphericLoss - m_freeSpacePathLoss - m_linkMargin;
NS_LOG_DEBUG("rxc="<<rxc);
return rxc;
}