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ASTROD, ASTROD I and their gravitational-wave sensitivities

Wei-Tou Ni1,2,3, Sachie Shiomi3 and An-Chi Liao3

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Astrodynamical space test of relativity using optical devices (ASTROD) is a mission concept with three spacecraft—one near the 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, measure the solar system and detect gravitational waves. ASTROD I with one spacecraft ranging optically with ground stations is the first step towards 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 Doppler tracking of spacecraft.


PACS

04.80.Nn Gravitational wave detectors and experiments

95.55.Ym Gravitational radiation detectors; mass spectrometers; and other instrumentation and techniques

42.79.-e Optical elements, devices, and systems

MSC

83C35 Gravitational waves

Subjects

Instrumentation and measurement

Optics, quantum optics and lasers

Gravitation and cosmology

Astrophysics and astroparticles

Dates

Issue 5 (7 March 2004)

Received 2 September 2003

Published 9 February 2004



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