Astrodynamical Space Test of Relativity using Optical Devices Original Research Article

We present the ASTROD (Astrodynamical Space Test of Relativity using Optical Devices) mission concept of using drag-free spacecraft in solar orbits together with a constellation of Earth orbiting satellites (including spacecraft near the Lagrange points) which provides high-precision measurement of relativistic effects, better determination of the orbits of major asteroids, improvement in the measurement of Gfot, measurement of solar angular momentum via Lense-Thirring effect and the detection of low-frequency gravitational waves in a single mission.