EOPPrediction Class Reference

#include <EarthOrientation.hpp>

List of all members.

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Detailed Description

Earth orientation parameter prediction Read data from EOPP###.txt file, available from NGA.

The formulas are: 2 2 xp(t)= A + B(t-ta) + SUM(Cj sin[2pi(t-ta)/Pj]) + SUM(Dj cos[2pi(t-ta)/Pj]) j=1 j=1

2 2 yp(t)= E + F(t-ta) + SUM(Gk sin[2pi(t-ta)/Qk]) + SUM(Hk cos[2pi(t-ta)/Qk]) k=1 k=1

4 4 UT1-UTC(t)= I+J(t-tb) + SUM(Km sin[2pi(t-tb)/Rm]) + SUM(Lm cos[2pi(t-tb)/Rm]) m=1 m=1 Ref. NGA document 'Earth Orientation Parameter Prediction (EOPP) Description' Effective date 08 August 2004 http://earth-info.nga.mil/GandG/sathtml/eoppdoc.html

Definition at line 97 of file EarthOrientation.hpp.

Public Member Functions
int	getValidTime (void) const throw ()
	access the time (MJD) of validity of these parameters; the range of validity is 'this' through 'this'+7.
int	loadFile (std::string filename) throw (FileMissingException)
	load the EOPPrediction in the given file
EarthOrientation	computeEOP (int &mjd) const throw (DayTime::DayTimeException)
	Compute and return the Earth orientation parameters at the given MJD.
EarthOrientation	computeEOP (DayTime &t) const throw ()
	Compute and return the Earth orientation parameters at the given epoch.
Static Public Member Functions
int	getSerialNumber (DayTime &t) throw (DayTime::DayTimeException)
	Generate serial number (NGA files are named EOPP<SN>.txt) from epoch.
int	getSerialNumber (int mjd) throw (DayTime::DayTimeException)
Public Attributes
int	TAIUTC
	the difference between TAI and UTC in seconds - not used in the computation
int	SerialNo
	the number used in the file name 'EOPP<sn>.txt'
std::string	Info
	information, including the MJD of generation of these parameters.
Friends
std::ostream &	operator<< (std::ostream &s, const EOPPrediction &)
	Stream output for the EOPPrediction, in format of EOPP###.txt files.

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Member Function Documentation

EarthOrientation computeEOP (  DayTime &  t  )  const throw ()

Compute and return the Earth orientation parameters at the given epoch. TD how to warn if input is outside limits of validity? Parameters: DayTime  t Time at which to compute the earth orientation parameters. Returns: the EarthOrientation. Definition at line 215 of file EarthOrientation.cpp. References gpstk::cos(), L1, L2, DayTime::MJD(), P1, P2, DayTime::secOfDay(), gpstk::sin(), TWO_PI, EarthOrientation::UT1mUTC, EarthOrientation::xp, and EarthOrientation::yp.

EarthOrientation computeEOP (  int &  mjd  )  const throw (DayTime::DayTimeException)

Compute and return the Earth orientation parameters at the given MJD. TD how to warn if input is outside limits of validity? Parameters: int  mjd Integer MJD at which to compute the earth orientation parameters. Returns: the EarthOrientation. Definition at line 193 of file EarthOrientation.cpp. References GPSTK_RETHROW, and DayTime::setMJD(). Referenced by EOPStore::addEOPPFile().

int getSerialNumber (  int  mjd  )  throw (DayTime::DayTimeException) [inline, static]

Definition at line 139 of file EarthOrientation.hpp. References DayTime::setMJD().

int getSerialNumber (  DayTime &  t  )  throw (DayTime::DayTimeException) [static]

Generate serial number (NGA files are named EOPP<SN>.txt) from epoch. SN (3 digit) = YWW : year (1 digit), week of year (2 digit) Parameters: DayTime  t Time at which to compute the serial number Returns: the serial number. Definition at line 163 of file EarthOrientation.cpp. References DayTime::dayOfWeek(), DayTime::GPSfullweek(), GPSTK_RETHROW, GPSTK_THROW, DayTime::setGPSfullweek(), DayTime::setYMDHMS(), and DayTime::year().

int getValidTime (  void   )  const throw () [inline]

access the time (MJD) of validity of these parameters; the range of validity is 'this' through 'this'+7. Definition at line 120 of file EarthOrientation.hpp. Referenced by EOPStore::addEOPPFile().

int loadFile (  std::string  filename  )  throw (FileMissingException)

load the EOPPrediction in the given file Parameters: filename  Name of file to read, including path. Returns: 0 ok, -1 error reading file. Exceptions: FileMissingException  if filename cannot be opened. Definition at line 74 of file EarthOrientation.cpp. References gpstk::StringUtils::asDouble(), gpstk::StringUtils::asInt(), GPSTK_THROW, L1, L2, P1, P2, gpstk::StringUtils::stripTrailing(), and gpstk::StringUtils::word(). Referenced by EOPStore::addEOPPFile().

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Friends And Related Function Documentation

std::ostream& operator<< (  std::ostream &  s, const EOPPrediction &  )  [friend]

Stream output for the EOPPrediction, in format of EOPP###.txt files. Parameters: os  stream to append formatted EOPPrediction to. Returns: reference to the input stream.

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Member Data Documentation

std::string Info

information, including the MJD of generation of these parameters. Definition at line 115 of file EarthOrientation.hpp. Referenced by gpstk::operator<<().

int SerialNo

the number used in the file name 'EOPP<sn>.txt' Definition at line 113 of file EarthOrientation.hpp. Referenced by gpstk::operator<<().

int TAIUTC

the difference between TAI and UTC in seconds - not used in the computation Definition at line 111 of file EarthOrientation.hpp. Referenced by gpstk::operator<<().

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The documentation for this class was generated from the following files:

• EarthOrientation.hpp
• EarthOrientation.cpp

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