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Long term observation of temporal Earth's gravity field with enhancedtemporal and spatial resolution is a major objective for future satellitegravity missions. Improving the performance of the accelerometers present insuch missions is one of the main path to explore. In this context, we proposeto study an original concept of a hybrid accelerometer associating astate-of-the-art electrostatic accelerometer (EA) and a promising quantumsensor based on cold atom interferometry. To assess the performance potentialof such instrument, numerical simulations have been performed to determine itsimpact in term of gravity field retrieval. Taking advantage of the long termstability of the cold atom interferometer (CAI), it has been shown that thereduced drift of the hybrid sensor could lead to improved gravity fieldretrieval. Nevertheless this gain vanishes once temporal variations of thegravity field and related aliasing effects are taken into account. Improvedde-aliasing models or some specific satellite constellations are then requiredto maximize the impact of the accelerometer performance gain. To evaluate theachievable acceleration performance in orbit, a numerical simulator of thehybrid accelerometer has been developed and preliminary results are given. Theinstrument simulator has been in part validated by reproducing the performanceachieved with a hybrid lab prototype operating on ground. The problematic ofsatellite rotation impact on the CAI has been also investigated both withinstrument performance simulations and experimental demonstrations. It has beenshown that the proposed configuration, where the EA's proof-mass acts as thereference mirror for the CAI, seems a promising approach to allow themitigation of satellite rotation. A preliminary design has been elaboratedalong with a preliminary error, mass, volume and electrical power consumptionbudget.

Hybrid electrostatic-atomic accelerometer for future space gravity missions