A.+Pulido+Patón

ASTROD is a relativity mission concept encompassing multi-purposes. Within its main objectives are mapping the solar-system gravity, measuring the related solarsystem parameters, testing relativistic gravity and detecting gravitational waves. Since ASTROD will be after LISA, in the Cosmic Vision time-frame 2015-2025, a ten-fold improvement over LISA’s accelerometer noise goal can be expected, allowing ASTROD to test relativistic gravity to 1 ppb, and improve gravitational wave sensitivity. We discuss ways of suppressing noise due to thermal, electromagnetic and local gravitational effects to improve drag-free performance, with emphasis in the low-frequency regime (below 0.1 mHz). To measure relative displacements between the proof mass and the spacecraft capacitive and/or optical sensing are considered.We discuss various possibilities of lower-frequency gravitational-wave responses and their significance to potential astrophysical sources.
 * Low frequency sensitivity to gravitational waves for ASTROD **
 * A. Pulido Paton ****, W.T. Ni,Purple Mountain Observatory, CAS **