/// <summary>
/// 获取插值后的 AtomicClock。
/// </summary>
/// <param name="PRN"></param>
/// <param name="gpsTime"></param>
/// <returns></returns>
public AtomicClock GetAtomicClock(Time gpsTime)
{
String name = sortedRecords[0].Name;
Data.Rinex.ClockType clkType = sortedRecords[0].ClockType;
if (gpsTime < MinAvailableTime || gpsTime > MaxAvailableTime)
{
throw new ArgumentException("历元在给定的时间段外，不可进行插值。");
}
double deltaX = (double)(gpsTime - minDataTime);
if (clkType == Data.Rinex.ClockType.Satellite)
{
return(new AtomicClock()
{
Name = name,
ClockType = clkType,
ClockDrift = interpDrift.GetY(deltaX),
ClockBias = interpError.GetY(deltaX),
Time = gpsTime,
Prn = sortedRecords[0].Prn
});
}
return(new AtomicClock()
{
Name = name,
ClockType = clkType,
ClockDrift = interpDrift.GetY(deltaX),
ClockBias = interpError.GetY(deltaX),
Time = gpsTime
});
}
/// <summary>
/// 获取插值后的 AtomicClock。
/// </summary>
/// <param name="PRN"></param>
/// <param name="gpsTime"></param>
/// <returns></returns>
public SimpleClockBias GetAtomicClock(Time gpsTime)
{
if (gpsTime < MinAvailableTime || gpsTime > MaxAvailableTime)
{
throw new ArgumentException("历元在给定的时间段外，不可进行插值。");
}
double deltaX = (double)(gpsTime - minDataTime);
return(new SimpleClockBias()
{
ClockBias = interpError.GetY(deltaX),
Time = gpsTime
});
}
/// <summary>
/// 获取插值后的 EphemerisInfo。
/// 注意：不对钟差相对论误差进行改正，此处时间是卫星钟时间，没有相对信息。2014.09.08
/// 失败，如超过时间，则返回null
/// 由于一般没有卫星速度的数据，必须通过插值坐标计算速度。2015.03.
/// 如果有速度信息，以下的方法就不合适了。
/// </summary>
/// <param name="gpsTime">时间</param>
/// <returns></returns>
public Ephemeris GetEphemerisInfo(Time gpsTime)
{
SatelliteNumber PRN = Ephemeris.Prn;
Time min = Ephemeris.Time;
//Time max = sortedRecords[sortedRecords.Count - 1].Time;
//double span = (double)(max - min);
double gpsSecond = (gpsTime - min); //减去序列中第一个数
////老是在这里出问题，宽限一点呢？？16分钟
//double expand = 60 * 16;
//if (gpsSecond + expand < 0 || gpsSecond - expand > span)
//{
// //return null;
// throw new ArgumentException("历元在给定的时间段外，不可进行插值。");
//}
//计算位置
double x = 0, y = 0, z = 0; double dtime = 0;
double dx = 0, dy = 0, dz = 0; double ddtime = 0;
int count = entities.Count;
int order = 10;
order = Math.Min(order, count);
//czs
// List<int> indexes = GetNearstIndexes(sortedRecords, gpsSecond, order);
//cy
//List<int> indexes = GetNearstIndexes(sortedRecords, gpsTime, order);
double[] t = new double[order];
double[] tList = new double[order + 1];
double[] xList = new double[order + 1];
double[] yList = new double[order + 1];
double[] zList = new double[order + 1];
double[] clockList = new double[order + 1];
int i = 0;
foreach (var item in this.entities)
{
Ephemeris record = item;
t[i] = (record.Time - gpsTime); //秒。
#region 方案1：顾及地球自转效应
//correction for earth rotation
double sinl = Math.Sin(SunMoonPosition.OMGE * t[i]);
double cosl = Math.Cos(SunMoonPosition.OMGE * t[i]);
xList[i] = cosl * record.XYZ.X - sinl * record.XYZ.Y;
yList[i] = sinl * record.XYZ.X + cosl * record.XYZ.Y;
zList[i] = record.XYZ.Z;
#endregion
#region 方案2：不顾及地球自转效应
//xList[time] = record.XYZ.X;
//yList[time] = record.XYZ.Y;
//zList[time] = record.XYZ.Z;
#endregion
//tList[i] = (record.Time - sortedRecords[0].Time); //秒。
// clockList[i] = record.ClockBias;
i++;
}
//Lagrange(tList, xList, gpsSecond, ref x, ref dx);
//Lagrange(tList, yList, gpsSecond, ref y, ref dy);
//Lagrange(tList, zList, gpsSecond, ref z, ref dz);
//Lagrange(tList, clockList, gpsSecond, ref dtime, ref ddtime);
//int Nhalf = (int)(order / 2) - 1;
//int Nmatch = indexes[Nhalf];
x = fitX.GetY(gpsSecond);
y = fitY.GetY(gpsSecond);
z = fitZ.GetY(gpsSecond);
dtime = fitClock.GetY(gpsSecond);
XYZ SatXyz = new XYZ(x, y, z);
//精度赋值
//XYZ SatXyzSig = sortedRecords[Nmatch].XyzSdev;
//double clockSig = sortedRecords[Nmatch].ClockSdev;
//XYZ SatXyzDotSig = new Geo.Coordinates.XYZ(0);
//计算速度
//double nextSecond = gpsSecond + 0.001;
//XYZ xyzNext = new XYZ(fitX.GetY(nextSecond), fitY.GetY(nextSecond), fitZ.GetY(nextSecond));
//XYZ speed = (xyzNext-xyz) / 0.001;
XYZ SatSpeed = new XYZ(dx, dy, dz);
//Add relativity correction to dtime
//This only for consistency with GPSEphemerisInter
//dtr=-2*dot(R,V)/(C*C)
//dtime +=EphemerisUtil.GetRelativeCorrection(SatXyz, SatSpeed);
return(new Ephemeris()
{
Prn = PRN,
XYZ = SatXyz,
//XyzSdev=SatXyzSig,
// Clock = fitClock.GetY(gpsSecond),
ClockBias = dtime,
//ClockSdev = clockSig,
ClockDrift = ddtime,
Time = gpsTime,
XyzDot = SatSpeed,
//XyzDotSdev=SatXyzDotSig
});
}