Annex 2: Outline of New IERS Conventions Edition

The IERS Conventions outline that is currently authorized by the IERS CC is shown below. Proposed modifications to this outline by the (to-be-selected) Chapter Editor-in-Chief, Chapter Expert(s), and/or IERS CC staff member may be considered after a thorough review by the entire IERS CC staff.

In addition, some IERS Conventions chapters are used by a wide-range of scientists and engineers who may have applications requiring less complexity, accuracy, and precision than the general IERS community. Therefore, where appropriate, Chapter Editors should consider including information regarding conventional models, procedures, and software that provide results addressing this concern, even if it requires additional sections to be added to the currently authorized outline.


1. General definitions and numerical standards

1.1 Permanent tide
1.2 Numerical standards


2. Conventional celestial reference systems and frames

2.1 The ICRS

2.1.1 Equator
2.1.2 Origin of right ascension

2.2 The ICRF

2.2.1 Optical realization of the ICRF
2.2.2 Availability of the frame

2.3 Dynamical realization of the ICRS.


3. Terrestrial reference systems and frames

3.1 Concepts and terminology

3.1.1 Basic concepts
3.1.2 TRF in space geodesy
3.1.3 Crust-based TRF
3.1.4 The International Terrestrial Reference System
3.1.5 Realizations of the ITRS

3.2 ITRF products

3.2.1 The IERS network
3.2.2 History of ITRF products
3.2.3 ITRF2005
3.2.4 ITRF2008, the current reference realization of the ITRS
3.2.5 ITRF as a realization of the ITRS
3.2.6 Transformation parameters between ITRF solutions

3.3 Access to the ITRS


4. Transformation between the ITRS and the GCRS

4.1 Introduction

4.2 The framework of IAU 2000/2006 resolutions

4.2.1 IAU 2000 resolutions
4.2.2 IAU 2006 resolutions

4.3 Implementation of IAU 2000 and IAU 2006 resolutions

4.3.1 The IAU 2000/2006 space-time reference systems
4.3.2 Schematic representation of the motion of the Celestial Intermediate Pole (CIP)
4.3.3 The IAU 2000/2006 realization of the Celestial Intermediate Pole (CIP)
4.3.4 Procedures for terrestrial-to-celestial transformation consistent with IAU 2000/2006 resolutions

4.4 Coordinate transformation consistent with the IAU 2000/2006 resolutions

4.4.1 Expression for the transformation matrix for polar motion
4.4.2 Expression for the CIO based transformation matrix for Earth rotation
4.4.3 Expression for the equinox based transformation matrix for Earth rotation
4.4.4 Expression for the transformation matrix for the celestial motion of the CIP
4.4.5 Expression for the equinox-based transformation matrix for precession-nutation

4.5 Parameters to be used in the transformation

4.5.1 Motion of the Celestial Intermediate Pole in the ITRS
4.5.2 Position of the Terrestrial Intermediate Origin in the ITRS
4.5.3 Earth Rotation Angle
4.5.4 Forced motion of the Celestial Intermediate Pole in the GCRS
4.5.5 Free Core Nutation
4.5.6 Position of the Celestial Intermediate Origin in the GCRS
4.5.7 ERA based expressions for Greenwich Sidereal Time

4.6 Description of the IAU 2000/2006 precession-nutation model

4.6.1 The IAU 2000A and IAU 2000B nutation model
4.6.2 Description of the IAU 2006 precession
4.6.3 IAU 2006 adjustments to the IAU 2000A nutation
4.6.4 Precession developments compatible with the IAU 2000/2006 model
4.6.5 Summary of different ways of implementing IAU 2006/2000A precession-nutation

4.7 The fundamental arguments of nutation theory

4.7.1 The multipliers of the fundamental arguments of nutation theory
4.7.2 Development of the arguments of lunisolar nutation
4.7.3 Development of the arguments for the planetary nutation

4.8 Prograde and retrograde nutation amplitudes

4.9 Algorithms for transformations between ITRS and GCRS

4.10 Notes on the new procedure to transform from ICRS to ITRS1


5. Geopotential

5.1 Conventional model based on the EGM2008 model

5.2 Effect of solid Earth tides

5.2.1 Conventional model for the solid Earth tides
5.2.2 Treatment of the permanent tide

5.3 Effect of the ocean tides

5.3.1 Background on ocean tide models
5.3.2 Ocean tide models

5.4 Solid Earth pole tide

5.5 Ocean pole tide

5.6 Conversion of tidal amplitudes defined according to different conventions


6. Displacement of terrestrial reference points

6.1 Models for conventional displacement of reference markers on the crust

6.1.1 Effects of the solid Earth tides
6.1.2 Local site displacement due to ocean loading
6.1.3 S1-S2 atmospheric pressure loading
6.1.4 Rotational deformation due to polar motion
6.1.5 Ocean pole tide loading

6.2 Models for other non-conventional displacement of reference markers on the crust

6.3 Models for the displacement of reference points of instruments

6.3.1 Models common to several techniques
6.3.2 Very long baseline interferometry
6.3.3 Global navigation satellite systems


7. Tidal variations in the Earth's rotation

7.1 Effect of the tidal deformation (zonal tides) on Earth's rotation

7.2 Diurnal and semi-diurnal variations due to ocean tides

7.3 Tidal variations in polar motion & polar motion excitation due to long period ocean tides


8. Models for atmospheric propagation delays

8.1 Tropospheric model for optical techniques

8.1.1 Zenith delay models
8.1.2 Mapping function
8.1.3 Future developments

8.2 Tropospheric model for radio techniques

8.3 Sources for meteorological data

8.4 Ionospheric model for radio techniques

8.4.1 Ionospheric delay dependence on radio signals including higher order terms
8.4.2 Correcting the ionospheric effects on code and phase


9. General relativistic models for space-time coordinates and equations of motion

9.1 Time coordinates

9.2 Transformation between proper time and coordinate time in the vicinity of the Earth

9.3 Equations of motion for an artificial Earth satellite

9.4 Equations of motion in the barycentric frame


10. General relativistic models for propagation

10.1 VLBI time delay

10.1.1 Historical background
10.1.2 Specifications and domain of application
10.1.3 The analysis of VLBI measurements: definitions and interpretation of results
10.1.4 The VLBI delay model.

10.2 Ranging technique