1. The Four Candidate Earth Explorer Core Missions Consultative Workshop 12-14 October 1999, Granada, Spain, Revised 2006-01-05 by CCT GOCE S 59 Performance Processing Scheme from Level 0 to Level 3 Mature Processing Methods and Algorithms

2. The Four Candidate Earth Explorer Core Missions Consultative Workshop 12-14 October 1999, Granada, Spain, Revised 2006-01-05 by CCT GOCE S 60 Performance Simulation Input

3. The Four Candidate Earth Explorer Core Missions Consultative Workshop 12-14 October 1999, Granada, Spain, Revised 2006-01-05 by CCT GOCE S 61 Performance End-to-End Simulation Scheme

4. The Four Candidate Earth Explorer Core Missions Consultative Workshop 12-14 October 1999, Granada, Spain, Revised 2006-01-05 by CCT GOCE S 62 instrument errors satellite errors instrument/satellite coupling errors post processing errors Performance Four Error Classes

5. The Four Candidate Earth Explorer Core Missions Consultative Workshop 12-14 October 1999, Granada, Spain, Revised 2006-01-05 by CCT GOCE S 63 Performance The 4 Error Classes: Simulated Results Instrument Error Coupling Error Satellite Error Post-Flight Error Total Error this total error is used in the geoid and gravity field retrievals

6. The Four Candidate Earth Explorer Core Missions Consultative Workshop 12-14 October 1999, Granada, Spain, Revised 2006-01-05 by CCT GOCE S 64 Performance Spherical Harmonic Error Spectrum

7. The Four Candidate Earth Explorer Core Missions Consultative Workshop 12-14 October 1999, Granada, Spain, Revised 2006-01-05 by CCT GOCE S 65 Performance Spectral Error Results 1 cm geoid and 1 mgal gravity field accuracies are well recovered at wavelength of 100 km (degree and order 200)

8. The Four Candidate Earth Explorer Core Missions Consultative Workshop 12-14 October 1999, Granada, Spain, Revised 2006-01-05 by CCT GOCE S 66 Performance Spatial Error Results 1 cm geoid and 1 mgal gravity field accuracies are well recovered at wavelength of 100 km (degree and order 200) for all latitudes except near the poles.

9. The Four Candidate Earth Explorer Core Missions Consultative Workshop 12-14 October 1999, Granada, Spain, Revised 2006-01-05 by CCT GOCE S 67 Performance Science Requirements: Summary

10. The Four Candidate Earth Explorer Core Missions Consultative Workshop 12-14 October 1999, Granada, Spain, Revised 2006-01-05 by CCT GOCE S 68 Performance Simulation Results 10 1 the simulated results suggest excellent performance versus scientific requirements

11. The Four Candidate Earth Explorer Core Missions Consultative Workshop 12-14 October 1999, Granada, Spain, Revised 2006-01-05 by CCT GOCE S 69 Performance Solid Earth Physics

12. The Four Candidate Earth Explorer Core Missions Consultative Workshop 12-14 October 1999, Granada, Spain, Revised 2006-01-05 by CCT GOCE S 70 Performance Oceanography

13. The Four Candidate Earth Explorer Core Missions Consultative Workshop 12-14 October 1999, Granada, Spain, Revised 2006-01-05 by CCT GOCE S 71 Performance Geodesy

14. The Four Candidate Earth Explorer Core Missions Consultative Workshop 12-14 October 1999, Granada, Spain, Revised 2006-01-05 by CCT GOCE S 72 GOCE will be the first gravity gradiometer in space an ambient temperature, capacitive gradiometer instrument is selected in combination with GPS high-low tracking GOCE will map the Earth’s gravity field in three dimensions providing a: - geoid error < 1 cm at 100 km spatial resolution - gravity field error << 1 mgal at 100 km spatial resolution The GOCE data will complement data from altimetric missions, Oersted, CHAMP, GRACE, ICESAT and Cryosat Conclusions Uniqueness and Complementarity

15. The Four Candidate Earth Explorer Core Missions Consultative Workshop 12-14 October 1999, Granada, Spain, Revised 2006-01-05 by CCT GOCE S 73 the gradiometer accelerometers and GPS receiver are based on European technology the drag free system technology offers new opportunities in a wide range of applications including E.O. from low orbit altitude a multi-disciplinary user community within fields of Solid Earth Physics, Geodesy and Oceanography is well prepared to utilize the new and accurate gravity field and geoid data at high spatial resolution Conclusions Advancement of European E.O. capabilities

16. The Four Candidate Earth Explorer Core Missions Consultative Workshop 12-14 October 1999, Granada, Spain, Revised 2006-01-05 by CCT GOCE S 74 all technologies have been demonstrated (except micro-thrusters) and the development schedule is acceptable an end-to-end and closed loop simulator provides realistic and comprehensive insight into system performance from the sensor level to the retrievals of the gravity field and geoid signals the processing schemes (from Level 0 to Level 3) and algorithm maturity are meeting the requirements impact studies show very promising results for applications in the disciplines of solid Earth physics, absolute ocean circulation and geodesy Conclusions Feasibility and Level of Maturity

17. The Four Candidate Earth Explorer Core Missions Consultative Workshop 12-14 October 1999, Granada, Spain, Revised 2006-01-05 by CCT GOCE S 75 Conclusions Timeliness and Programmatics the GOCE Mission is very timely in the context of the user needs and their associated readiness no implementation constraints exist the proposed launch in 2004 is in the low activity region of the solar cycle) the expected launch in late 2006 still OK.