Progress in Interferometry for LISA at JPL

Arm locking for space-based laser interferometry gravitational wave observatories

Laser frequency stabilization is a critical part of the interferometry measurement system of space-based gravitational wave observatories such as the Laser Interferometer Space Antenna (LISA). Arm locking as a proposed frequency stabilization technique, transfers the stability of the long arm lengths to the laser frequency. The arm locking sensor synthesizes an adequately filtered linear combination of the inter-spacecraft phase measurements to estimate the laser frequency noise, which can be used to control the laser frequency. At the University of Florida we developed the hardware-based Univ…

Experimental Demonstration of Time-Delay Interferometry for the Laser Interferometer Space Antenna

We report on the first demonstration of time-delay interferometry (TDI) for LISA, the Laser Interferometer Space Antenna. TDI was implemented in a laboratory experiment designed to mimic the noise couplings that will occur in LISA. TDI suppressed laser frequency noise by approximately 10^9 and clock phase noise by 6x10^4, recovering the intrinsic displacement noise floor of our laboratory test bed. This removal of laser frequency noise and clock phase noise in post-processing marks the first experimental validation of the LISA measurement scheme.

Comparison of LISA and Atom Interferometry for Gravitational Wave Astronomy in Space

One of the atom interferometer gravitational wave missions proposed by Dimopoulos et al.1 in 2008 was called AGIS-Sat. 2. It had a suggested gravitational wave sensitivity set by the atom state detection shot noise level that started at 1 mHz, was comparable to LISA sensitivity from 1 to about 20 mHz, and had better sensitivity from 20 to 500 mHz. The separation between the spacecraft was 1,000 km, with atom interferometers 200 m long and shades from sunlight used at each end. A careful analysis of many error sources was included, but requirements on the time-stability of both the laser wavefr…

利用时间延迟干涉组合抑制引力参考传感器数据异常

Suppressing data anomalies of gravitational reference sensors with time delay interferometry combinations

针对LISA和太极任务中引力参考传感器的数据异常问题，提出采用位置噪声抑制型时间延迟干涉通道，可在敏感频带内将异常抑制超两个数量级，且无需异常先验模型。

LISA专用倾斜到长度校准机动设计

Design of Dedicated Tilt-to-Length Calibration Maneuvers for LISA

本文针对LISA任务中的TTL噪声问题，提出通过旋转机动估计耦合系数的方法，发现特定正弦信号调制可在20分钟内高精度估计TTL系数，为在轨后处理噪声消除提供最优方案。