//首先，选择在起始时刻所有满足条件的卫星，
//查找这些卫星的最大高度角的位置(附近6小时内)，选择距离远的，
//查找其结束点高度角时刻，
//继续遍历
public PeriodPrn BuildOnePeriodPrnByCenterTop(Time startTime)
{
var endTime = startTime + SearchTimeSpan;
List <String> prnsString = GetStartPrns(startTime);
List <TableCell> maxCells = new List <TableCell>();
foreach (var colName in prnsString)
{
if (SatElevationTable.MinusNext(colName, startTime) < 0) //方向必须朝上
{
var max = SatElevationTable.GetFirstSlopeApproxTo(colName, CutOffAngle, startTime, false);
// var max = SatElevationTable.GetMaxCell(colName, startTime, endTime);
maxCells.Add(max);
}
}
if (maxCells.Count == 0)
{
return(null);
}
var longest = maxCells.OrderByDescending(m => m.RowNumber).First();
SatelliteNumber selectedPrn = SatelliteNumber.Parse(longest.ColName);
var endTimePeriod = (Time)SatElevationTable.GetIndexValue(longest.RowNumber);
TimePeriod TimePeriod = new Geo.Times.TimePeriod(startTime, endTimePeriod);
var PeriodPrn = new PeriodPrn(TimePeriod, selectedPrn);
return(PeriodPrn);
}
private PeriodPrn BuildOnePeriodPrnByCenterTop2(Time startTime)
{
var endTime = startTime + SearchTimeSpan;
List <String> prnsString = GetStartPrns(startTime);
List <TableCell> maxCells = new List <TableCell>();
foreach (var item in prnsString)
{
if (SatElevationTable.MinusNext(item, startTime) < 0) //方向必须朝上
{
var max = SatElevationTable.GetMaxCell(item, startTime, endTime);
maxCells.Add(max);
}
}
var longest = maxCells.FindAll(m => (double)m.Value > CutOffAngle).OrderByDescending(m => m.RowNumber).First();
SatelliteNumber selectedPrn = SatelliteNumber.Parse(longest.ColName);
//查找其结尾处，满足条件的时刻或历元
var startTime2 = (Time)SatElevationTable.GetIndexValue(longest.RowNumber);
var endTime2 = startTime2 + SearchTimeSpan;
TableCell endCell = SatElevationTable.GetCellApproxTo(longest.ColName, CutOffAngle, startTime2, endTime2);
var endTimePeriod = (Time)SatElevationTable.GetIndexValue(endCell.RowNumber);
TimePeriod TimePeriod = new Geo.Times.TimePeriod(startTime, endTimePeriod);
var PeriodPrn = new PeriodPrn(TimePeriod, selectedPrn);
return(PeriodPrn);
}
/// <summary>
/// 默认构造函数
/// </summary>
/// <param name="perid"></param>
/// <param name="val"></param>
public TimePeriodValue(TimePeriod perid, TValue val)
{
this.Value = val;
this.TimePeriod = perid;
}
public int CompareTo(TimePeriodValue <TValue> other)
{
return(TimePeriod.CompareTo(other.TimePeriod));
}
