org.orekit.time

Class UTCTAIBulletinAFilesLoader

java.lang.Object

org.orekit.time.UTCTAIBulletinAFilesLoader

All Implemented Interfaces:

UTCTAIOffsetsLoader

public class UTCTAIBulletinAFilesLoader
extends Object
implements UTCTAIOffsetsLoader

Loader for UTC-TAI extracted from bulletin A files.

This class is a modified version of BulletinAFileLoader that only parses the TAI-UTC header line and checks the UT1-UTC column for discontinuities.

Note that extracting UTC-TAI from bulletin A files is NOT recommended. There are known issues in some past bulletin A (for example bulletina-xix-001.txt from 2006-01-05 has a wrong year for last leap second and bulletina-xxi-053.txt from 2008-12-31 has an off by one value for TAI-UTC on MJD 54832). This is a known problem, and the Earth Orientation Department at USNO told us this TAI-UTC data was only provided as a convenience and this data should rather be sourced from other official files. As the bulletin A files are a record of past publications, they cannot modify archived bulletins, hence the errors above will remain forever. This UTC-TAI loader should therefore be used with great care.

This class is immutable and hence thread-safe

Since:

7.1

Author:

Luc Maisonobe

Constructor Summary

Constructors

Constructor and Description
UTCTAIBulletinAFilesLoader(String supportedNames) Build a loader for IERS bulletins A files.

Method Summary

Modifier and Type	Method and Description
List<OffsetModel>	loadOffsets() Load UTC-TAI offsets entries.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

UTCTAIBulletinAFilesLoader

public UTCTAIBulletinAFilesLoader(String supportedNames)

Build a loader for IERS bulletins A files.

Parameters:

supportedNames - regular expression for supported files names

Method Detail

loadOffsets

public List<OffsetModel> loadOffsets()
                              throws OrekitException

Load UTC-TAI offsets entries.

Specified by:

loadOffsets in interface UTCTAIOffsetsLoader

Returns:

sorted UTC-TAI offsets entries (if the linear offsets used prior to 1972 are missing, they will be inserted automatically)

Throws:

OrekitException - if time steps are inconsistent