ASTROD, ASTROD I and their gravitational-wave sensitivities

Research paper by Wei-Tou Ni, Sachie Shiomi, An-Chi Liao

Indexed on: 02 Sep '03Published on: 02 Sep '03Published in: General Relativity and Quantum Cosmology


ASTROD (Astrodynamical Space Test of Relativity using Optical Devices) is a mission concept with three spacecraft -- one near L1/L2 point, one with an inner solar orbit and one with an outer solar orbit, ranging coherently with one another using lasers to test relativistic gravity, to measure the solar system and to detect gravitational waves. ASTROD I with one spacecraft ranging optically with ground stations is the first step toward the ASTROD mission. In this paper, we present the ASTROD I payload and accelerometer requirements, discuss the gravitational-wave sensitivities for ASTROD and ASTROD I, and compare them with LISA and radio-wave PDoppler-tracking of spacecraft.