gnsstk::EOPPrediction Class Reference

Detailed Description

class EOPPrediction. 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 81 of file EOPPrediction.hpp.

#include <EOPPrediction.hpp>

Public Member Functions
EarthOrientation	computeEOP (double &mjd) const
EarthOrientation	computeEOP (int &imjd) const
int	getValidTime () const
int	loadFile (const std::string &filename)

Static Public Member Functions
static int	getSerialNumber (int mjd)

Public Attributes
std::string	Info
	information, including the MJD of generation of these parameters. More...
int	SerialNo
	the number used in the file name 'EOPP<SN>.txt' More...
int	TAIUTC

Private Attributes
double	A
	parameters used in the formulas More...
double	B
double	C1
double	C2
double	D1
double	D2
double	E
double	F
double	G1
double	G2
double	H1
double	H2
double	I
double	J
double	K1
double	K2
double	K3
double	K4
double	L1
double	L2
double	L3
double	L4
double	P1
	more parameters used in the formulas More...
double	P2
double	Q1
double	Q2
double	R1
double	R2
double	R3
double	R4
double	ta
	reference times (MJD) used in the formulas More...
double	tb
double	tv

Friends
std::ostream &	operator<< (std::ostream &os, const EOPPrediction &eopp)

Member Function Documentation

computeEOP() [1/2]

EarthOrientation gnsstk::EOPPrediction::computeEOP

(

double &

mjd

)

const

Compute and return the Earth orientation parameters at the given epoch. TD how to warn if input is outside limits of validity?

Parameters

mjd	Time (MJD) at which to compute the earth orientation parameters.

Returns

the EarthOrientation object at mjd.

Definition at line 267 of file EOPPrediction.cpp.

computeEOP() [2/2]

EarthOrientation gnsstk::EOPPrediction::computeEOP ( int &  imjd ) const

inline

Compute and return the Earth orientation parameters at the given MJD. TD how to warn if input is outside limits of validity?

Parameters

imjd	integer MJD at which to compute the earth orientation parameters

Returns

the EarthOrientation at imjd.

Exceptions

Exception

Definition at line 138 of file EOPPrediction.hpp.

getSerialNumber()

int gnsstk::EOPPrediction::getSerialNumber ( int  mjd )

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

mjd	Time (MJD) at which to compute the serial number

Returns

the serial number.

Exceptions

Exception

Definition at line 216 of file EOPPrediction.cpp.

getValidTime()

int gnsstk::EOPPrediction::getValidTime ( ) const

inline

access the time (MJD) of validity of these parameters; the range of validity is 'this' through 'this'+7.

Definition at line 112 of file EOPPrediction.hpp.

loadFile()

int gnsstk::EOPPrediction::loadFile

(

const std::string &

filename

)

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 56 of file EOPPrediction.cpp.

Friends And Related Function Documentation

operator<<

std::ostream& operator<< ( std::ostream &  os, const EOPPrediction &  eopp  )

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.

Member Data Documentation

A

double gnsstk::EOPPrediction::A

private

parameters used in the formulas

Definition at line 92 of file EOPPrediction.hpp.

B

double gnsstk::EOPPrediction::B

private

Definition at line 92 of file EOPPrediction.hpp.

C1

double gnsstk::EOPPrediction::C1

private

Definition at line 92 of file EOPPrediction.hpp.

C2

double gnsstk::EOPPrediction::C2

private

Definition at line 92 of file EOPPrediction.hpp.

D1

double gnsstk::EOPPrediction::D1

private

Definition at line 92 of file EOPPrediction.hpp.

D2

double gnsstk::EOPPrediction::D2

private

Definition at line 92 of file EOPPrediction.hpp.

E

double gnsstk::EOPPrediction::E

private

Definition at line 92 of file EOPPrediction.hpp.

F

double gnsstk::EOPPrediction::F

private

Definition at line 92 of file EOPPrediction.hpp.

G1

double gnsstk::EOPPrediction::G1

private

Definition at line 92 of file EOPPrediction.hpp.

G2

double gnsstk::EOPPrediction::G2

private

Definition at line 92 of file EOPPrediction.hpp.

H1

double gnsstk::EOPPrediction::H1

private

Definition at line 92 of file EOPPrediction.hpp.

H2

double gnsstk::EOPPrediction::H2

private

Definition at line 92 of file EOPPrediction.hpp.

I

double gnsstk::EOPPrediction::I

private

Definition at line 92 of file EOPPrediction.hpp.

Info

std::string gnsstk::EOPPrediction::Info

information, including the MJD of generation of these parameters.

Definition at line 106 of file EOPPrediction.hpp.

J

double gnsstk::EOPPrediction::J

private

Definition at line 92 of file EOPPrediction.hpp.

K1

double gnsstk::EOPPrediction::K1

private

Definition at line 92 of file EOPPrediction.hpp.

K2

double gnsstk::EOPPrediction::K2

private

Definition at line 92 of file EOPPrediction.hpp.

K3

double gnsstk::EOPPrediction::K3

private

Definition at line 92 of file EOPPrediction.hpp.

K4

double gnsstk::EOPPrediction::K4

private

Definition at line 92 of file EOPPrediction.hpp.

L1

double gnsstk::EOPPrediction::L1

private

Definition at line 93 of file EOPPrediction.hpp.

L2

double gnsstk::EOPPrediction::L2

private

Definition at line 93 of file EOPPrediction.hpp.

L3

double gnsstk::EOPPrediction::L3

private

Definition at line 93 of file EOPPrediction.hpp.

L4

double gnsstk::EOPPrediction::L4

private

Definition at line 93 of file EOPPrediction.hpp.

P1

double gnsstk::EOPPrediction::P1

private

more parameters used in the formulas

Definition at line 95 of file EOPPrediction.hpp.

P2

double gnsstk::EOPPrediction::P2

private

Definition at line 95 of file EOPPrediction.hpp.

Q1

double gnsstk::EOPPrediction::Q1

private

Definition at line 95 of file EOPPrediction.hpp.

Q2

double gnsstk::EOPPrediction::Q2

private

Definition at line 95 of file EOPPrediction.hpp.

R1

double gnsstk::EOPPrediction::R1

private

Definition at line 95 of file EOPPrediction.hpp.

R2

double gnsstk::EOPPrediction::R2

private

Definition at line 95 of file EOPPrediction.hpp.

R3

double gnsstk::EOPPrediction::R3

private

Definition at line 95 of file EOPPrediction.hpp.

R4

double gnsstk::EOPPrediction::R4

private

Definition at line 95 of file EOPPrediction.hpp.

SerialNo

int gnsstk::EOPPrediction::SerialNo

the number used in the file name 'EOPP<SN>.txt'

Definition at line 104 of file EOPPrediction.hpp.

ta

double gnsstk::EOPPrediction::ta

private

reference times (MJD) used in the formulas

Definition at line 90 of file EOPPrediction.hpp.

TAIUTC

int gnsstk::EOPPrediction::TAIUTC

the difference between TAI and UTC in seconds - not used in the computation

Definition at line 102 of file EOPPrediction.hpp.

tb

double gnsstk::EOPPrediction::tb

private

Definition at line 90 of file EOPPrediction.hpp.

tv

double gnsstk::EOPPrediction::tv

private

MJD of beginning of times at which this formula is valid; end time of validity is tv+7. In EOPP files, this is an integer.

Definition at line 88 of file EOPPrediction.hpp.

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

• EOPPrediction.hpp
• EOPPrediction.cpp