StkEphemerisFile Class

public class StkEphemerisFile

Public Class StkEphemerisFile

public ref class StkEphemerisFile

type StkEphemerisFile =  class end

// Use any valid TLE to create a propagator, and use that propagator to create a MotionEvaluator.
TwoLineElementSet inputTwoLineElementSet =
    new TwoLineElementSet(@"1 20813U 90084A   07157.52757149 -.00000978  00000-0  10000-3 0  8139
                            2 20813  62.3585 177.5907 7234421 261.2958  18.3008  2.01001663122427");
Sgp4Propagator propagator = new Sgp4Propagator(inputTwoLineElementSet);
MotionEvaluator<Cartesian> motionEvaluator = propagator.GetEvaluator();

// Define start time, stop time, and time step that will be used to sample the motion evaluator for ephemeris data.
JulianDate startDate = new GregorianDate(2007, 6, 1).ToJulianDate();
JulianDate stopDate = new GregorianDate(2007, 6, 2).ToJulianDate();
Duration timeStep = Duration.FromSeconds(60);

// Using the MotionEvaluator created above, output ephemeris data in a format that can be processed by
// the StkEphemerisFile object. Passing null for the ITrackCalculationProgress indicates that the Evaluate step
// should not track progress.
DateMotionCollection<Cartesian> rawEphemerisData = motionEvaluator.Evaluate(startDate, stopDate, timeStep, 0, null);

// The data obtained from the MotionEvaluator is in meters.  Convert to desired units, kilometers in this case.
DateMotionCollection<Cartesian> rawEphemerisDataKm = new DateMotionCollection<Cartesian>();
double toKilometers = 1.0 / 1000.0;
for (int i = 0; i < rawEphemerisData.Count; i++)
{
    rawEphemerisDataKm.Add(rawEphemerisData.Dates[i], rawEphemerisData.Motions[i].Value * toKilometers);
}

// Once the raw data has been obtained from the MotionEvaluator and converted as necessary, place it into an StkEphemerisFile
// and specify the appropriate coordinate system.
StkEphemerisFile.EphemerisTimePos ephemerisData = new StkEphemerisFile.EphemerisTimePos
{
    CoordinateSystem = propagator.ReferenceFrame,
    EphemerisData = rawEphemerisDataKm,
};
StkEphemerisFile ephemerisFile = new StkEphemerisFile
{
    Data = ephemerisData
};

// Use the "Properties" element of the STKEphemerisFile to specify any additional supported properties
// such as the distance unit of the data.
ephemerisFile.Properties.Add("DistanceUnit", "Kilometers");

// Finally, write the StkEphemerisFile out.
using (StreamWriter ephemerisWriter = new StreamWriter(path, false, Encoding.ASCII))
{
    ephemerisFile.WriteTo(ephemerisWriter);
}