NATIONAL REPORT OF THE FEDERAL REPUBLIC OF ... - IAG Office

72 Commission 2 – Gravity Field
metry and Earth Dynamics, sponsored by the European
Space Agency (ESA), culminated in a book edited by
FLURY and RUMMEL (2005) of the same name. In it, the
study participants lay out the requirements from various
Earth science disciplines on future gravity field satellite
missions. A number of mission scenarios are simulated to
investigate whether future missions can meet such requirements
SNEEUW et al. (2005).
More recently (April 2007) IAPG organized, together with
SRON (Netherlands) and ESA, a dedicated workshop on
the Future of Satellite Gravimetry. The workshop identified
two main theoretical challenges for future gravity missions:
1) aliasing of fast time variations into the gravity solutions,
and 2) separability of individual mass sources. Potential
future measurement concepts, like atomic interference and
optical clocks, were presented. Moreover the workshop
participants, both from Europe and USA, engaged in more
political and strategic discussions as to the organization and
realization of future gravity missions.
Formation flying may help in solving some of the limitations
of current gravity field missions. The feasibility and
utility of formation flight for future dedicated missions was
investigated by SNEEUW and SCHAUB (2005). From a more
practical viewpoint GERLACH and VISSER (2006) investigated
the potential geodetic use of the geomagnetics
mission SWARM. Unless a dedicated mission is funded
for the post-GRACE and -GOCE era, the SWARM constellation
of three satellites, all carrying GNSS-receivers,
may be one of the few sources of satellite gravimetry in the
years to come.
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