/* This code takes a set of Cartesian coordinates in a fixed frame and converts them into Keplerian orbital elements in an inertial frame
* without using a satellite object (using conversion utility within STK Engine). The Keplerian elements you would like to return can be specified
* by changing the enum values near the top of the Main function.
*/
static void Main(string[] args)
{
AgSTKXApplication app = new AgSTKXApplication();
app.NoGraphics = true;
AgStkObjectRoot root = new AgStkObjectRoot();
// Here are some preliminary variables for the classical coordinate elements you would like to obtain
SizeShapeTypes SizeShapeType = SizeShapeTypes.Altitude;
AscNodeTypes AscNodeType = AscNodeTypes.RAAN;
LocationTypes LocationType = LocationTypes.ArgumentOfLatitude;
// Here we create a new AgOrbitState object
IAgConversionUtility ConversionUtility = root.ConversionUtility;
IAgOrbitState cartesianOrbit = ConversionUtility.NewOrbitStateOnEarth();
// Here is how you display and change the epoch
Console.WriteLine("Epoch:");
cartesianOrbit.Epoch = "1 Jun 2003 17:00:00.000";
Console.WriteLine(cartesianOrbit.Epoch);
// Here we assign whatever Cartesian coordinates we would like to in a fixed frame
cartesianOrbit.AssignCartesian(AgECoordinateSystem.eCoordinateSystemFixed, 5598.42, -14988.6, 4.80738, 3.408, 1.27376, 2.60903);
// Now we convert the orbit to a classical orbit state
IAgOrbitStateClassical classicalOrbit = cartesianOrbit.ConvertTo(AgEOrbitStateType.eOrbitStateClassical) as IAgOrbitStateClassical;
Console.WriteLine(classicalOrbit.CoordinateSystemType);
// Prints out the first two classical orbit elements
switch (SizeShapeType)
{
case SizeShapeTypes.Altitude:
classicalOrbit.SizeShapeType = AgEClassicalSizeShape.eSizeShapeAltitude;
IAgClassicalSizeShapeAltitude sizeShapeAltitude = classicalOrbit.SizeShape as IAgClassicalSizeShapeAltitude;
Console.WriteLine("Apogee Altitude:");
Console.WriteLine(sizeShapeAltitude.ApogeeAltitude);
Console.WriteLine("Perigee Altitude:");
Console.WriteLine(sizeShapeAltitude.PerigeeAltitude);
break;
case SizeShapeTypes.MeanMotion:
classicalOrbit.SizeShapeType = AgEClassicalSizeShape.eSizeShapeMeanMotion;
IAgClassicalSizeShapeMeanMotion sizeShapeMeanMotion = classicalOrbit.SizeShape as IAgClassicalSizeShapeMeanMotion;
Console.WriteLine("Mean Motion:");
Console.WriteLine(sizeShapeMeanMotion.MeanMotion);
Console.WriteLine("Eccentricity:");
Console.WriteLine(sizeShapeMeanMotion.Eccentricity);
break;
case SizeShapeTypes.Period:
classicalOrbit.SizeShapeType = AgEClassicalSizeShape.eSizeShapePeriod;
IAgClassicalSizeShapePeriod sizeShapePeriod = classicalOrbit.SizeShape as IAgClassicalSizeShapePeriod;
Console.WriteLine("Period:");
Console.WriteLine(sizeShapePeriod.Period);
Console.WriteLine("Eccentricity:");
Console.WriteLine(sizeShapePeriod.Eccentricity);
break;
case SizeShapeTypes.Radius:
classicalOrbit.SizeShapeType = AgEClassicalSizeShape.eSizeShapeRadius;
IAgClassicalSizeShapeRadius sizeShapeRadius = classicalOrbit.SizeShape as IAgClassicalSizeShapeRadius;
Console.WriteLine("Apogee Radius:");
Console.WriteLine(sizeShapeRadius.ApogeeRadius);
Console.WriteLine("Perigee Radius:");
Console.WriteLine(sizeShapeRadius.PerigeeRadius);
break;
case SizeShapeTypes.SemimajorAxis:
classicalOrbit.SizeShapeType = AgEClassicalSizeShape.eSizeShapeSemimajorAxis;
IAgClassicalSizeShapeSemimajorAxis sizeShapeSemimajorAxis = classicalOrbit.SizeShape as IAgClassicalSizeShapeSemimajorAxis;
Console.WriteLine("Semimajor Axis:");
Console.WriteLine(sizeShapeSemimajorAxis.SemiMajorAxis);
Console.WriteLine("Eccentricity:");
Console.WriteLine(sizeShapeSemimajorAxis.Eccentricity);
break;
}
// Prints the inclination and argument of perigee
IAgClassicalOrientation orientation = classicalOrbit.Orientation;
Console.WriteLine("Inclination:");
Console.WriteLine(orientation.Inclination);
Console.WriteLine("Argument of Perigee:");
Console.WriteLine(orientation.ArgOfPerigee);
// This section prints the ascending node value
Console.WriteLine("Ascending Node:");
switch (AscNodeType)
{
case AscNodeTypes.RAAN:
orientation.AscNodeType = AgEOrientationAscNode.eAscNodeRAAN;
IAgOrientationAscNodeRAAN ascNodeRAAN = orientation.AscNode as IAgOrientationAscNodeRAAN;
Console.WriteLine(ascNodeRAAN.Value);
break;
case AscNodeTypes.LAN:
orientation.AscNodeType = AgEOrientationAscNode.eAscNodeLAN;
IAgOrientationAscNodeLAN ascNodeLAN = orientation.AscNode as IAgOrientationAscNodeLAN;
Console.WriteLine(ascNodeLAN.Value);
break;
}
// This section prints the location of the satellite along the orbit in terms of whatever you would like
Console.WriteLine("Location:");
switch (LocationType)
{
case LocationTypes.ArgumentOfLatitude:
classicalOrbit.LocationType = AgEClassicalLocation.eLocationArgumentOfLatitude;
IAgClassicalLocationArgumentOfLatitude locationArgumentOfLatitude = classicalOrbit.Location as IAgClassicalLocationArgumentOfLatitude;
Console.WriteLine(locationArgumentOfLatitude.Value);
break;
case LocationTypes.EccentricAnomaly:
classicalOrbit.LocationType = AgEClassicalLocation.eLocationEccentricAnomaly;
IAgClassicalLocationEccentricAnomaly locationSpecificEccentricAnomaly = classicalOrbit.Location as IAgClassicalLocationEccentricAnomaly;
Console.WriteLine(locationSpecificEccentricAnomaly.Value);
break;
case LocationTypes.MeanAnomaly:
classicalOrbit.LocationType = AgEClassicalLocation.eLocationMeanAnomaly;
IAgClassicalLocationMeanAnomaly locationSpecificMeanAnomaly = classicalOrbit.Location as IAgClassicalLocationMeanAnomaly;
Console.WriteLine(locationSpecificMeanAnomaly.Value);
break;
case LocationTypes.TimePastAN:
classicalOrbit.LocationType = AgEClassicalLocation.eLocationTimePastAN;
IAgClassicalLocationTimePastAN locationSpecificTimePastAN = classicalOrbit.Location as IAgClassicalLocationTimePastAN;
Console.WriteLine(locationSpecificTimePastAN.Value);
break;
case LocationTypes.TimePastPerigee:
classicalOrbit.LocationType = AgEClassicalLocation.eLocationTimePastPerigee;
IAgClassicalLocationTimePastPerigee locationSpecificTimePastPerigee = classicalOrbit.Location as IAgClassicalLocationTimePastPerigee;
Console.WriteLine(locationSpecificTimePastPerigee.Value);
break;
case LocationTypes.TrueAnomaly:
classicalOrbit.LocationType = AgEClassicalLocation.eLocationTrueAnomaly;
IAgClassicalLocationTrueAnomaly locationTrueAnomaly = classicalOrbit.Location as IAgClassicalLocationTrueAnomaly;
Console.WriteLine(locationTrueAnomaly.Value);
break;
}
Console.ReadLine();
}
//added selected TDRSs into the model
private void add_tdrs(station_str passed)
{
IAgSatellite localtdrs;
localtdrs = (IAgSatellite)m_oApplication.CurrentScenario.Children.New(AGI.STKObjects.AgESTKObjectType.eSatellite, passed.name);
//AGI.STKObjects.IAgSatellite sat = (IAgSatellite)m_oApplication.CurrentScenario.Children.NewOnCentralBody(AGI.STKObjects.AgESTKObjectType.eSatellite, orbitdata[i].name, centerbodyname);
//disable the leading ground track
localtdrs.Graphics.PassData.GroundTrack.SetLeadDataType(AgELeadTrailData.eDataNone);
//disable trailing ground track
localtdrs.Graphics.PassData.GroundTrack.SetTrailDataType(AgELeadTrailData.eDataNone);
localtdrs.VO.Pass.TrackData.PassData.GroundTrack.SetLeadDataType(AgELeadTrailData.eDataNone);
localtdrs.VO.Pass.TrackData.PassData.GroundTrack.SetTrailDataType(AgELeadTrailData.eDataNone);
localtdrs.VO.Pass.TrackData.PassData.Orbit.SetLeadDataType(AgELeadTrailData.eDataNone);
localtdrs.VO.Pass.TrackData.PassData.Orbit.SetTrailDataType(AgELeadTrailData.eDataNone);
//set the propagator type to HPOP
localtdrs.SetPropagatorType(AGI.STKObjects.AgEVePropagatorType.ePropagatorJ2Perturbation);
AGI.STKObjects.IAgVePropagatorJ2Perturbation hpop = (AGI.STKObjects.IAgVePropagatorJ2Perturbation)localtdrs.Propagator;
IAgOrbitState orbit = hpop.InitialState.Representation;
//create the string to hold the missions epoch date & time
string cmb_epoch = startdate, cmb_end = enddate;
cmb_epoch += " 00:00:00";
DateTime epochDT = Convert.ToDateTime(cmb_epoch);
DateTime endepochDT = Convert.ToDateTime(cmb_end);
//hpop.InitialState.Representation.Assign(orbit);
Console.Write("epochtime = " + epochDT.ToString("dd MMM yyyy ") + "00:00:00" + "\n");
hpop.InitialState.Representation.Epoch = (epochDT.ToString("dd MMM yyyy ") + "00:00:00");
// hpop.InitialState.Representation.Assign(ia)
//hpop.InitialState.Representation.AssignClassical(AgECoordinateSystem.eCoordinateSystemJ2000, orbitdata[i].sma, orbitdata[i].ecc, orbitdata[i].inc, orbitdata[i].aop, orbitdata[i].raan, orbitdata[i].ma);
//hpop.Propagate();
IAgOrbitStateClassical classical = (IAgOrbitStateClassical)hpop.InitialState.Representation.ConvertTo(AgEOrbitStateType.eOrbitStateClassical);
classical.CoordinateSystemType = AGI.STKUtil.AgECoordinateSystem.eCoordinateSystemJ2000;
IAgCrdnEventIntervalSmartInterval interval = hpop.EphemerisInterval;
interval.SetExplicitInterval((epochDT.ToString("dd MMM yyyy ") + "00:00:00"), (endepochDT.ToString("dd MMM yyyy ") + "00:00:00"));
hpop.Step = 60;
classical.LocationType = AgEClassicalLocation.eLocationTrueAnomaly;
IAgClassicalLocationTrueAnomaly trueAnomaly = (IAgClassicalLocationTrueAnomaly)classical.Location;
trueAnomaly.Value = 178.845262;
classical.SizeShapeType = AgEClassicalSizeShape.eSizeShapePeriod;
IAgClassicalSizeShapePeriod period = (IAgClassicalSizeShapePeriod)classical.SizeShape;
period.Eccentricity = 0.0;
period.Period = 86164.090540;
classical.Orientation.ArgOfPerigee = 0.0;
classical.Orientation.Inclination = 0.0;
classical.Orientation.AscNodeType = AgEOrientationAscNode.eAscNodeLAN;
IAgOrientationAscNodeLAN lan = (IAgOrientationAscNodeLAN)classical.Orientation.AscNode;
lan.Value = (360 - passed.lon);
hpop.InitialState.Representation.Assign(classical);
hpop.Propagate();
}