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arXiv 2212.05967gr-qc
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第二代时间延迟干涉测量

Second-Generation Time-Delay Interferometry

Massimo Tinto, Sanjeev Dhurandhar, Dishari Malakar

AI总结:

针对非静止LISA阵列中与航天器间速度线性相关的残余激光噪声,本文推广TDI组合的迭代构造方法,以提升第一代生成元并构建第二代TDI空间。

摘要:

时间延迟干涉测量(TDI)是一种数据处理技术,用于消除影响不等臂天基引力波干涉仪外差多普勒测量的大幅激光相位涨落。所有TDI组合构成的空间最初是在静止阵列这一简化假设下推导出来的,在该假设下三个时间延迟算符彼此对易。在这一模型中,TDI空间的任意元素都可以写成四个TDI变量的线性组合,它们是“第一代”TDI空间的生成元。为了在真实阵列构型中充分抑制激光相位涨落,必须考虑阵列的旋转以及六个航天器间光传播时间的时间依赖性。对于激光干涉空间天线(LISA)这项由ESA与NASA合作、臂长缓慢随时间变化的任务,人们已经能够识别出若干数据组合;这些组合在航天器间速度的一阶精度下,要么精确消除激光相位涨落,要么将其抑制到低于外差测量固有噪声源(即所谓“次级”噪声)所确定的水平。本文重新分析了精确消除与航天器间速度呈线性关系的残余激光噪声项这一问题。我们发现,获得第二代TDI空间元素的过程可以通过迭代方式加以推广。这使我们能够“提升”第一代TDI空间的生成元,并构造更高阶TDI空间的元素。

英文摘要:

Time-Delay Interferometry (TDI) is the data processing technique that cancels the large laser phase fluctuations affecting the heterodyne Doppler measurements made by unequal-arm space-based gravitational wave interferometers. The space of all TDI combinations was first derived under the simplifying assumption of a stationary array, for which the three time-delay operators commute. In this model, any element of the TDI space can be written as a linear combination of four TDI variables, the generators of the "first-generation" TDI space. To adequately suppress the laser phase fluctuations in a realistic array configuration, the rotation of the array and the time-dependence of the six inter-spacecraft light-travel-times have to be accounted for. In the case of the Laser Interferometer Space Antenna (LISA), a joint ESA-NASA mission characterized by slowly time varying arm-lengths, it has been possible to identify data combinations that, to first order in the inter-spacecraft velocities, either exactly cancel or suppress the laser phase fluctuations below the level identified by the noise sources intrinsic to the heterodyne measurements (the so called "secondary" noises). Here we reanalyze the problem of exactly canceling the residual laser noise terms linear in the inter-spacecraft velocities. We find that the procedure for obtaining elements of the $2^{\rm nd}$-generation TDI space can be generalized in an iterative way. This allows us to "lift-up" the generators of the $1^{\rm st}$-generation TDI space and construct elements of the higher order TDI space.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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