  We propose a concept for future space gravity missions using cold atom
interferometers for measuring the diagonal elements of the gravity gradient
tensor and the spacecraft angular velocity. The aim is to achieve better
performance than previous space gravity missions due to a very low white noise
spectral behavior and a very high common mode rejection, with the ultimate
goals of determining the fine structures of the gravity field with higher
accuracy than GOCE and detecting time-variable signals in the gravity field
better than GRACE.
