//! Calculate satellite position at a single point in time
/*!
* \param tle of satellite
* \param EpochTime to calculate position
* \param int WGS-Data to use 0 = WGS_72; 1 = WGS_84
* \return SGP4Data containing satellite position data
*/
public static Sgp4Data getSatPositionAtTime(Tle satellite, EpochTime atTime, Sgp4.wgsConstant wgs)
{
Sgp4 sgp4Propagator = new Sgp4(satellite, wgs);
sgp4Propagator.runSgp4Cal(atTime, atTime, 1 / 60.0);
return(sgp4Propagator.getResults()[0]);
}
private List <Sgp4Data> CalculatePositionList(int start, int end)
{
var startTime = new EpochTime(TimeKeeper.Now().AddMinutes(start));
var endTime = new EpochTime(TimeKeeper.Now().AddMinutes(end));
var sgp4Propagator = new Sgp4(Tle, Sgp4.wgsConstant.WGS_84);
sgp4Propagator.runSgp4Cal(startTime, endTime, 0.01);
return(sgp4Propagator.getResults());
}
public static async Task <Satellite> FindClosestSatellite(double userLat, double userLong, double userHeight)
{
List <Tle> tleList = ParserTLE.ParseFile(pathToTLEData);
Vector3 difference = new Vector3(0, 0, 0);
Satellite closest = new Satellite("Temporary Satellite. If you see this, you done messed up", double.MaxValue);
List <Satellite> satellites = new List <Satellite>();
One_Sgp4.Coordinate observer = new Coordinate(userLat, userLong, userHeight);
for (int i = 0; i < tleList.Count; i++)
{
//Create Time points
EpochTime startTime = new EpochTime(DateTime.UtcNow);
EpochTime stopTime = new EpochTime(DateTime.UtcNow.AddHours(1));
One_Sgp4.Sgp4 sgp4Propagator = new Sgp4(tleList[i], Sgp4.wgsConstant.WGS_84);
try
{
sgp4Propagator.runSgp4Cal(startTime, stopTime, 0.5);
}
catch
{
Console.WriteLine("Something went wrong with " + tleList[i].getName());
}
List <One_Sgp4.Sgp4Data> resultDataList = new List <Sgp4Data>();
//Return Results containing satellite Position x,y,z (ECI-Coordinates in Km) and Velocity x_d, y_d, z_d (ECI-Coordinates km/s)
resultDataList = sgp4Propagator.getResults();
try
{
double localSiderealTime = startTime.getLocalSiderealTime(observer.getLongitude());
Sgp4Data grrPoint = One_Sgp4.SatFunctions.getSatPositionAtTime(tleList[0], startTime, Sgp4.wgsConstant.WGS_84);
One_Sgp4.Point3d sphCoordsSat = One_Sgp4.SatFunctions.calcSphericalCoordinate(observer, startTime, resultDataList[0]);
double distance = sphCoordsSat.x;
Satellite satellite = new Satellite(tleList[i].getName(), distance);
satellites.Add(satellite);
if (distance < closest.distance)
{
closest = satellite;
}
}
catch
{
//Something went wrong with a satellite, skipped
}
}
closest.distance = Math.Round(closest.distance, 2);
return(closest);
//Console.WriteLine("Done: " + satellites.Count + " satellites successfully analyzed from " + tleList.Count + " in the dataset.");
//Console.WriteLine("The closest active satellite is " + closest.name.Trim() + " which is " + Math.Round(closest.distance, 2).ToString() + " kilometres away from you. Time: " + DateTime.Now.ToString("HH:mm:ss"));
//Console.WriteLine();
}
static void Main(string[] args)
{
//Parse three line element
Tle tleISS = ParserTLE.parseTle(
"1 25544U 98067A 19364.04305556 -.00001219 00000-0 -13621-4 0 9993",
"2 25544 51.6441 110.3812 0005206 82.0414 249.9912 15.49519575205634",
"ISS 1");
//Parse tle from file
if (System.IO.File.Exists("tleData.txt"))
{
List <Tle> tleList = ParserTLE.ParseFile("tleData.txt");
}
//Get TLE from Space-Track.org
//list of satellites by their NORAD ID
string[] noradIDs = { "8709", "43572" };
try
{
One_Sgp4.SpaceTrack.GetSpaceTrack(noradIDs, "USERNAME", "PASSWORD");
}
catch { Console.Out.WriteLine("Error could not retrive TLE's from Space-Track, Login credentials might be wrong"); }
//Create Time points
EpochTime startTime = new EpochTime(DateTime.UtcNow);
EpochTime anotherTime = new EpochTime(2018, 100.5); //(Year 2018, 100 day at 12:00 HH)
EpochTime stopTime = new EpochTime(DateTime.UtcNow.AddHours(1));
//get time difference
double daysSince = startTime - anotherTime;
//throws exception if first time > second time
//double daysSince = anotherTime - startTime;
//compare Time points
EpochTime compareTime = new EpochTime(2018, 100.5); //(Year 2018, 100 day at 12:00 HH)
bool equals = anotherTime == compareTime;
bool notequals = startTime != anotherTime;
bool greater = startTime > anotherTime;
bool smaler = anotherTime < startTime;
//Add 15 Seconds to EpochTime
anotherTime.addTick(15);
//Add 20 Min to EpochTime
anotherTime.addMinutes(15);
//Add 1 hour to EpochTime
anotherTime.addHours(1);
//Add 2 Days to EpochTime
anotherTime.addDays(2);
Console.Out.WriteLine(anotherTime.ToString());
//Calculate Satellite Position and Speed
One_Sgp4.Sgp4 sgp4Propagator = new Sgp4(tleISS, Sgp4.wgsConstant.WGS_84);
//set calculation parameters StartTime, EndTime and caclulation steps in minutes
sgp4Propagator.runSgp4Cal(startTime, stopTime, 1 / 30.0); // 1/60 => caclulate sat points every 2 seconds
List <One_Sgp4.Sgp4Data> resultDataList = new List <Sgp4Data>();
//Return Results containing satellite Position x,y,z (ECI-Coordinates in Km) and Velocity x_d, y_d, z_d (ECI-Coordinates km/s)
resultDataList = sgp4Propagator.getResults();
startTime = new EpochTime(DateTime.Now);
//Coordinate of an observer on Ground lat, long, height(in meters)
One_Sgp4.Coordinate observer = new Coordinate(35.00, 18, 0);
//Convert to ECI coordinate system
One_Sgp4.Point3d eci = observer.toECI(0.0);
Console.Out.WriteLine("Sidereal Time: " + startTime.getLocalSiderealTime());
Console.Out.WriteLine(String.Format("X: {0}, Y: {1}, Z: {2} ", eci.x, eci.y, eci.z));
//Get Local SiderealTime for Observer
double localSiderealTime = startTime.getLocalSiderealTime(observer.getLongitude());
//Calculate if Satellite is Visible for a certain Observer on ground at certain timePoint
bool satelliteIsVisible = One_Sgp4.SatFunctions.isSatVisible(observer, 0.0, startTime, resultDataList[0]);
//Calculate Sperical Coordinates from an Observer to Satellite
//returns 3D-Point with range(km), azimuth(radians), elevation(radians) to the Satellite
One_Sgp4.Point3d spherical = One_Sgp4.SatFunctions.calcSphericalCoordinate(observer, startTime, resultDataList[0]);
//Calculate the Next 5 Passes over a point
//for a location, Satellite, StartTime, Accuracy in Seconds = 15sec, MaxNumber of Days = 5 Days, Wgs constant = WGS_84
//Returns pass with Location, StartTime of Pass, EndTime Of Pass, Max Elevation in Degrees
List <Pass> passes = One_Sgp4.SatFunctions.CalculatePasses(observer, tleISS, new EpochTime(DateTime.UtcNow));
foreach (var p in passes)
{
Console.Out.WriteLine(p.ToString());
}
Console.Out.WriteLine("Done");
}
