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首页> 外文会议>Conference on Gravitational-Wave Detection, Aug 23-25, 2002, Waikoloa, Hawaii, USA >The use of drag-free spacecraft in the detection of low-frequency gravitational radiation
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The use of drag-free spacecraft in the detection of low-frequency gravitational radiation

机译：无阻力航天器在探测低频重力辐射中的用途

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摘要

The detection of low-frequency gravitational radiation (i.e. below 1 Hz) requires a space-borne detector, principally to escape the effects of seismic noise which plague ground-based detectors at low frequencies. Although the seismic disturbance is eliminated, the space environment introduces its own set of problems. For example, solar radiation pressure. This can be shielded by the technique of "drag-free control", whereby the spacecraft encompassing the test mass (or interferometer mirror, etc) provides protection from the external disturbances. A feedback control system ensures that the spacecraft remains "centered" on the internal mass, whilst at the same time being physically de-coupled from it (to the maximum practical extent). As well as attenuating the external disturbances, the drag-free control system must minimize the relative motion between the spacecraft and test mass, in order to reduce forces arising from dynamic coupling between the two. Missions like LISA which will perform ultra-precise interferometric measurements require drag-free thruster and sensor technologies with extremely low noise levels. An overview of the requirements and the technologies currently being pursued for the LISA drag-free control system is presented.
机译：低频重力辐射（即低于1 Hz）的检测需要一个太空探测器，主要是为了逃避地震噪声的影响，而低频地震困扰着地面探测器。尽管消除了地震干扰，但空间环境却带来了自己的一系列问题。例如，太阳辐射压力。这可以通过“无阻力控制”技术来屏蔽，其中，包围测试质量块（或干涉仪镜等）的航天器可以免受外界干扰。反馈控制系统可确保航天器在内部质量上保持“居中”，同时又与内部物理分离（达到最大实际程度）。除了减轻外部干扰外，无阻力控制系统还必须最小化航天器与测试质量之间的相对运动，以减小两者之间动态耦合产生的力。像LISA这样的任务将执行超高精度的干涉测量，需要无阻力的推进器和传感器技术，且其噪声水平必须极低。概述了LISA无拖曳控制系统的要求和当前正在追求的技术。

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