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Code Issues Releases Wiki Activity

Fix wrong speed

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This commit is contained in:
Tim Schubert 2020-08-19 02:40:13 +02:00
parent 95bc153b1b
commit a92c54703f
5 changed files with 20 additions and 19 deletions
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12
examples/leo-circular-orbit-tracing-example.cc
View file

@ -32,11 +32,11 @@ public:
int main(int argc, char *argv[])
{
std::vector<Orbit> orbits = {
Orbit (1.150, 53.0, 32, 50),
Orbit (1.110, 53.8, 32, 50),
Orbit (1.130, 74.0, 8, 50),
Orbit (1.275, 81, 5, 75),
Orbit (1.325, 70, 6, 75),
Orbit (1150, 53.0, 32, 50),
Orbit (1110, 53.8, 32, 50),
Orbit (1130, 74.0, 8, 50),
Orbit (1275, 81, 5, 75),
Orbit (1325, 70, 6, 75),
};
NodeContainer satellites;
for (Orbit orb: orbits)
@ -62,7 +62,7 @@ int main(int argc, char *argv[])
outfile << "Time,Satellite,x,y,z,Speed" << std::endl;
Simulator::Stop (Hours (2.0));
Simulator::Stop (Hours (24));
Simulator::Run ();
Simulator::Destroy ();
}

13
model/leo-circular-orbit-mobility-model.cc
View file

@ -82,8 +82,9 @@ LeoCircularOrbitMobilityModel::GetSpeed () const
Vector
LeoCircularOrbitMobilityModel::DoGetVelocity () const
{
Vector3D heading = CrossProduct (PlaneNorm (), DoGetPosition ());
// TODO
Vector3D pos = DoGetPosition ();
pos = Vector3D (pos.x / pos.GetLength (), pos.y / pos.GetLength (), pos.z / pos.GetLength ());
Vector3D heading = CrossProduct (PlaneNorm (), pos);
return Product (GetSpeed (), heading);
}
@ -106,7 +107,7 @@ LeoCircularOrbitMobilityModel::GetProgress (Time t) const
{
sign = -1;
}
return sign * (2 * M_PI * ((GetSpeed () * t.GetSeconds ()) / LEO_EARTH_RAD_M)) + m_offset;
return sign * (2 * M_PI * ((GetSpeed () * t.GetSeconds ()) / LEO_EARTH_RAD_KM)) + m_offset;
}
Vector3D
@ -130,7 +131,7 @@ LeoCircularOrbitMobilityModel::CalcPosition (Time t) const
{
double lat = CalcLatitude ();
// account for orbit latitude and earth rotation offset
Vector3D x = Product (m_orbitHeight, Vector3D (cos (m_inclination) * cos (lat),
Vector3D x = Product (m_orbitHeight*1000, Vector3D (cos (m_inclination) * cos (lat),
cos (m_inclination) * sin (lat),
sin (m_inclination)));
@ -175,12 +176,12 @@ LeoCircularOrbitMobilityModel::DoSetPosition (const Vector &position)
double LeoCircularOrbitMobilityModel::GetAltitude () const
{
return m_orbitHeight - LEO_EARTH_RAD_M;
return m_orbitHeight - LEO_EARTH_RAD_KM;
}
void LeoCircularOrbitMobilityModel::SetAltitude (double h)
{
m_orbitHeight = LEO_EARTH_RAD_M + h;
m_orbitHeight = LEO_EARTH_RAD_KM + h;
Update ();
}

2
model/leo-circular-orbit-mobility-model.h
View file

@ -9,7 +9,7 @@
#include "ns3/mobility-model.h"
#include "ns3/nstime.h"
#define LEO_EARTH_RAD_M 6371009.0
#define LEO_EARTH_RAD_KM 6371.0090
#define LEO_EARTH_GM_KM_E10 39.8600436
namespace ns3 {

6
test/leo-orbit-test-suite.cc
View file

@ -38,7 +38,7 @@ private:
mob->SetAttribute ("Altitude", DoubleValue (0.0));
mob->SetAttribute ("Inclination", DoubleValue (1.0));
NS_TEST_ASSERT_MSG_EQ_TOL (mob->GetPosition ().GetLength(), LEO_EARTH_RAD_M, 0.1, "Unexpected position on earths surface for 1 deg inclination");
NS_TEST_ASSERT_MSG_EQ_TOL (mob->GetPosition ().GetLength() / 1000, LEO_EARTH_RAD_KM, 0.1, "Unexpected position on earths surface for 1 deg inclination");
}
};
@ -51,7 +51,7 @@ private:
void TestLengthPosition (double expl, double expx, Ptr<LeoCircularOrbitMobilityModel> mob)
{
Vector pos = mob->GetPosition ();
NS_TEST_EXPECT_MSG_EQ_TOL_INTERNAL (pos.GetLength (), expl, 0.001, "Distance to earth should be the same", __FILE__, __LINE__);
NS_TEST_EXPECT_MSG_EQ_TOL_INTERNAL (pos.GetLength () / 1000, expl, 0.001, "Distance to earth should be the same", __FILE__, __LINE__);
NS_TEST_EXPECT_MSG_NE_INTERNAL (pos.x, expx, "Position should not be equal", __FILE__, __LINE__);
}
@ -62,7 +62,7 @@ private:
mob->SetAttribute ("Inclination", DoubleValue (20.0));
Vector pos = mob->GetPosition ();
Simulator::Schedule (Seconds (100.0), &LeoOrbitProgressTestCase::TestLengthPosition, this, LEO_EARTH_RAD_M, pos.x, mob);
Simulator::Schedule (Seconds (100.0), &LeoOrbitProgressTestCase::TestLengthPosition, this, LEO_EARTH_RAD_KM, pos.x, mob);
Simulator::Stop (Seconds (101.0));
Simulator::Run ();
Simulator::Destroy ();

6
utils/plot-satellites.gnuplot
View file

@ -11,8 +11,9 @@ set xrange [-8e6:8e6]
set yrange [-8e6:8e6]
set zrange [-8e6:8e6]
set parametric
set isosamples 100,100
set isosamples 20,20
unset key
unset title
set hidden3d
# number of nodes per time slot
@ -22,8 +23,7 @@ ground=ARG2
numsats=ARG3
numsamples=ARG4
do for [j=0:numsamples] {
set title 'time '.j
do for [j=0:numsamples-1] {
splot [-pi:pi][-pi/2:pi/2] EARTH*cos(u)*cos(v), EARTH*sin(u)*cos(v), EARTH*sin(v), \
ground using 1:2:3 lt rgb "green", \
sats using 3:4:5:2 every ::(j*numsats)::((j+1)*numsats) lt rgb "blue"