public EphGps findEph(long unixTime, int satID, char satType, Location initialLocation)
{
long requestedTime = unixTime;
EphGps eph = null;
int maxBack = 12;
while (eph == null && (maxBack--) > 0)
{
RinexNavigationParserGps rnp = getRNPByTimestamp(requestedTime, initialLocation);
if (rnp != null)
{
if (rnp.isTimestampInEpocsRange(unixTime))
{
eph = rnp.findEph(unixTime, satID, satType);
}
}
if (eph == null)
{
requestedTime -= (1L * 3600L * 1000L);
}
}
return(eph);
}
/** Compute the GPS satellite coordinates
*
* INPUT:
* @param unixTime = time of measurement reception - UNIX [milliseconds]
* @param range = pseudorange measuremnent [meters]
* @param satID = satellite ID
* @param satType = satellite type indicating the constellation (E: Galileo,
* G: GPS)
* @param receiverClockError = 0.0
*/
public SatellitePosition getSatPositionAndVelocities(long unixTime, double range, int satID, char satType, double receiverClockError, Location initialLocation)
{
//long unixTime = obs.getRefTime().getMsec();
//double range = obs.getSatByIDType(satID, satType).getPseudorange(0);
RinexNavigationParserGps rnp = getRNPByTimestamp(unixTime, initialLocation);
if (rnp != null)
{
if (rnp.isTimestampInEpocsRange(unixTime))
{
return(rnp.getSatPositionAndVelocities(unixTime, range, satID, satType, receiverClockError));
}
else
{
return(null);
}
}
return(null);
}