/// <summary>
/// 电离层拟合器返回最后或第一相邻历元的电离层偏差
/// </summary>
/// <returns></returns>
public double GetDeltaIonoPolyFitValue(bool isFirstOrLast, int fitDataCount = 10)
{
if (this.Count < 5) //数据太少，不如不算
{
return(0);
}
if (OrderOfDeltaIonoPolyFit > this.Count - 1)
{
return(0);
}
if (fitDataCount > this.Count)
{
fitDataCount = Count;
}
int startCount = isFirstOrLast ? 0 : Count - fitDataCount;
LsPolyFit fit = new LsPolyFit(OrderOfDeltaIonoPolyFit);
Dictionary <double, double> dic = new Dictionary <double, double>();
var keys = this.OrderedKeys.GetRange(startCount, fitDataCount);
var first = keys[0];
foreach (var item in keys)
{
var data = this[item];
double x = (item - first);
double y = 0.5 * (data.PseudoRange - data.PhaseRange);
dic.Add(x, y);
}
fit.InitAndFitParams <double>(dic, m => m);
//fit.InitAndFitParams<Time>(dic, m => m.SecondsOfWeek);
double firstVal = fit.GetY(0);
if (isFirstOrLast)
{
double secondKey = keys[1] - first;
double secondVal = fit.GetY(secondKey);
double firstDiffer = secondVal - firstVal;
return(firstDiffer);
}
else
{
double lastKeyDiffer = keys.Last() - first;
double lastSeocndKeyDiffer = keys[keys.Count - 2] - first;
double fitVal = fit.GetY(lastKeyDiffer);
double fitSecondVal = fit.GetY(lastSeocndKeyDiffer);
double lastDiffer = fitVal - fitSecondVal;
return(lastDiffer);
}
}
/// <summary>
/// 返回一个距离历元最近的结果。
/// </summary>
/// <param name="prn"></param>
/// <param name="epoch">需要精确的时刻</param>
/// <returns></returns>
public double Get(SatelliteNumber prn, Time epoch)
{
if (Data != null)
{
if (Data.ContainsKeyBA(prn.ToString(), epoch))
{
return(Data[epoch, prn.ToString()]);
}
if (!Data.ContainsKeyB(prn.ToString()))
{
return(0);
}
if (!TimePeriod.Contains(epoch))
{
return(0);
}
var vals = Data.GetValuesByKeyB(prn.ToString());
//获取最近几个
var dic = Geo.Utils.DoubleUtil.GetNearst(vals, m => m.SecondsOfWeek, epoch, FitCount);
if (IsAverageOrFit)
{
var ave = dic.Values.Average();
return(ave);
}
else
{
LsPolyFit fit = new LsPolyFit(2);
fit.InitAndFitParams <Time>(dic, m => m.SecondsOfWeek);
var y = fit.GetY(epoch.SecondsOfWeek);
return(y);
}
}
return(0);
}
/// <summary>
/// 拟合下一个数据。
/// </summary>
/// <param name="nextIndex">下一个编号，0为推1个单位，1为外推2个单位</param>
/// <param name="order"></param>
/// <returns></returns>
public RmsedNumeral GetNextLsPolyFitValue(double nextIndex = 0, int order = 2)
{
LsPolyFit fit = GetLsPolyFit(order);
return(new RmsedNumeral(fit.GetY(this.Count + nextIndex), fit.StdDev));
}