Astrodynamical Space Test of Relativity using Optical Devices I (ASTROD I) - A class-M fundamental physics mission proposal for Cosmic Vision 2015-2025: 2010 Update
Claus Braxmaier, Hansjörg Dittus, Bernard Foulon, Ertan Göklü, Catia Grimani, Jian Guo, Sven Herrmann, Claus Lämmerzahl, Wei-Tou Ni, Achim Peters, Benny Rievers, Étienne Samain, Hanns Selig, Diana Shaul, Drazen Svehla, Pierre Touboul, Gang Wang, An-Ming Wu, Alexander F. Zakharov
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15 pages, 11 figures, 1 table, based on our 2010 proposal submitted for the ESA call for class-M mission proposals, a sequel and an update to previous paper [Experimental Astronomy 23 (2009) 491-527] which was based on our last proposal submitted for the 2007 ESA call, submitted to Experimental Astronomy
This paper on ASTROD I is based on our 2010 proposal submitted for the ESA call for class-M mission proposals, and is a sequel and an update to our previous paper [Experimental Astronomy 23 (2009) 491-527; designated as Paper I] which was based on our last proposal submitted for the 2007 ESA call. In this paper, we present our orbit selection with one Venus swing-by together with orbit simulation. In Paper I, our orbit choice is with two Venus swing-bys. The present choice takes shorter time (about 250 days) to reach the opposite side of the Sun. We also present a preliminary design of the optical bench, and elaborate on the solar physics goals with the radiation monitor payload. We discuss telescope size, trade-offs of drag-free sensitivities, thermal issues and present an outlook. ASTROD I is a planned interplanetary space mission with multiple goals. The primary aims are: to test General Relativity with an improvement in sensitivity of over 3 orders of magnitude, improving our understanding of gravity and aiding the development of a new quantum gravity theory; to measure key solar system parameters with increased accuracy, advancing solar physics and our knowledge of the solar system; and to measure the time rate of change of the gravitational constant with an order of magnitude improvement and the anomalous Pioneer acceleration, thereby probing dark matter and dark energy gravitationally. It is envisaged as the first in a series of ASTROD missions. ASTROD I will consist of one spacecraft carrying a telescope, four lasers, two event timers and a clock. Two-way, two-wavelength laser pulse ranging will be used between the spacecraft in a solar orbit and deep space laser stations on Earth, to achieve the ASTROD I goals.
Astrodynamical Space Test of Relativity using Optical Devices I (ASTROD I) - A class-M fundamental physics mission proposal for Cosmic Vision 2015-2025
使用光学装置进行相对论天体动力学空间试验是一项多用途相对论飞行任务概念。ASTROD的科学目标是以前所未有的精度测量相对论和太阳系参数，探测和观测频率低至$5\times10^{-6}$ Hz的低频引力波。为了实现其目标，ASTROD将采用一个无阻力卫星星座，目标是在0.1 mHz时剩余加速度噪声为（0.3-1）$\times$ 10 $^{-15}$ m s $^{-2}$ Hz $^{-1/2}$。本文介绍了汽车加速噪声的来源和改善措施。
Acceleration disturbances and requirements for ASTROD I
使用光学装置的相对论天文动力学空间试验一号（ASTROD一号）的主要目的是通过在太阳轨道上的航天器和地面站之间进行激光测距，高精度地测试相对论重力和测量太阳系参数。为了实现这些目标，在0.1 m Hz时，检测质量块的总加速度扰动的幅度必须小于10 13 m s 2 Hz 1/2。在本文中，我们给出了一个初步的概述的来源和幅度的加速扰动，可能会出现在ASTROD我证明质量。基于加速度扰动的估计，并通过假设一个简单的控制回路模型，我们推断ASTROD I的要求。我们的估计表明，与激光干涉仪空间天线（LISA）相比，ASTROD I的大部分要求可以放宽。
