Self-Gravity Modeling for LISA
Self-Gravity Modeling for LISA
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发表时间：
2004
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通讯作者：
S. Merkowitz
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作者：
S. Merkowitz
激光干涉仪空间天线(LISA)任务是一种基于空间的引力波探测器，使用激光计量学来测量三个航天器上的验证质量之间的距离波动。对每个标准质量的总加速度扰动要求小于3 x 10(Exp 15)m/平方赫兹。航天器变形和航天器运动引起的自重噪声预计将是加速噪声预算的一个重要因素。为了使这些影响最小化，每个样品质量处的引力场必须保持尽可能小、平坦和恒定。据估计，静电场必须保持在5×10(exp-10)m/sq以下S，梯度低于3×10(exp-8)/sq S才能达到所需的噪声水平。最有可能的是，无法通过测量直接验证LISA航天器是否满足这些要求；它们必须通过模型进行验证。LISA集成建模团队开发了一种新的自重工具，该工具可以计算样件上的引力和力矩，以帮助LISA航天器的设计和验证。我们在此概述工具和使用LISA当前基线设计计算的最新自重结果。我们还介绍了将在LISA探路者任务中飞行的ST-7 DRS包的自重分析结果。
The Laser Interferometer Space Antenna (LISA) mission, a space based gravitational wave detector, uses laser metrology to measure distance fluctuations between proof masses aboard three spacecraft. The total acceleration disturbance to each proof mass is required to be below 3 x 10(exp 15) m/sq square root of Hz. Self-gravity noise due to spacecraft distortion and spacecraft motion is expected to be a significant contributor to the acceleration noise budget. To minimize these effects, the gravitational field at each proof mass must be kept as small, flat, and constant as possible. It is estimated that the static field must be kept below 5 x 10(exp -10) m/sq s with a gradient below 3 x 10(exp -8)/sq s in order to meet the required noise levels. Most likely it will not be possible to directly verify by measurements that the LISA spacecraft meets these requirements; they must be verified by models. The LISA Integrated Modeling team developed a new self-gravity tool that calculates the gravitational forces and moments on the proof masses to aid in the design and verification of the LISA spacecraft. We present here an overview of tool and the latest self-gravity results calculated using the current baseline design of LISA. We also present results of a self-gravity analysis of the ST-7 DRS package that will fly on the LISA Pathfinder mission.