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);
}
//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);
}
/// <summary>
/// 选择
/// </summary>
/// <returns></returns>
public override PeriodPrnManager Select()
{
this.DetailResultTable = new ObjectTableStorage("DetailResultTableOf_" + TableSatSelectorType + "_" + PeriodCount + "Count");
var PeriodPrnManager = new PeriodPrnManager();
var startTime = (Time)SatElevationTable.GetIndexValue(0);
var stepPeriod = TotalPeriodSpan / PeriodCount;
for (int i = 0; i < PeriodCount; i++)
{
var start = startTime + TimeSpan.FromSeconds(i * stepPeriod);
var end = start + TimeSpan.FromSeconds(stepPeriod);
TimePeriod TimePeriod = new TimePeriod(start, end);
BaseTableSatelliteSelector selector = null;
switch (TableSatSelectorType)
{
case Gnsser.BaseSatSelectionType.MaxElevation:
selector = new TableElevationSatSelector(SatElevationTable, TimePeriod, CutOffAngle, false);
break;
case Gnsser.BaseSatSelectionType.MaxCenterElevation:
selector = new TableElevationSatSelector(SatElevationTable, TimePeriod, CutOffAngle, true, 1);
break;
case Gnsser.BaseSatSelectionType.MaxTimeSpan:
selector = new TableSpanSatSelector(SatElevationTable, TimePeriod, CutOffAngle);
break;
}
SatelliteNumber prn = selector.Select();
var PeriodPrn = new PeriodPrn(TimePeriod, prn);
this.AddPeriodPrnToManager(PeriodPrnManager, PeriodPrn);
}
return(PeriodPrnManager);
}