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Advancing space-based gravitational wave astronomy: Rapid parameter estimation via normalizing flows

Science China(Physics,Mechanics & Astronomy) 2024年第3期67卷 20-33页

作者： Minghui Du Bo Liang He Wang Peng Xu ziren luo Yueliang Wu Center for Gravitational Wave Experiment National Microgravity LaboratoryInstitute of MechanicsChinese Academy of SciencesBeijing 100190China Key Laboratory of Gravitational Wave Precision Measurement of Zhejiang Province Hangzhou Institute for Advanced StudyUniversity of Chinese Academy of SciencesHangzhou 310024China Shanghai Institute of Optics and Fine Mechanics Chinese Academy of SciencesShanghai 201800China International Centre for Theoretical Physics Asia-Pacific University of Chinese Academy of SciencesBeijing 100049China Taiji Laboratory for Gravitational Wave Universe(Beijing/Hangzhou) University of Chinese Academy of SciencesBeijing 100049China Lanzhou Center of Theoretical Physics Lanzhou UniversityLanzhou 730000China Hangzhou Institute for Advanced Study University of Chinese Academy of SciencesHangzhou 310024China Institute of Theoretical Physics Chinese Academy of SciencesBeijing 100190China

Gravitational wave(GW) astronomy is witnessing a transformative shift from terrestrial to space-based detection, with missions like Taiji at the forefront. While the transition brings unprecedented opportunities for exploring massive black hole binaries(MBHBs), it also imposes complex challenges in data analysis, particularly in parameter estimation amidst confusion noise.Addressing this gap, we utilize scalable normalizing flow models to achieve rapid and accurate inference within the Taiji environment. Innovatively, our approach simplifies the data's complexity, employs a transformation mapping to overcome the year-period time-dependent response function, and unveils additional multimodality in the arrival time parameter. Our method estimates MBHBs several orders of magnitude faster than conventional techniques, maintaining high accuracy even in complex backgrounds. These findings significantly enhance the efficiency of GW data analysis, paving the way for rapid detection and alerting systems and enriching our ability to explore the universe through space-based GW observation.

关键词： Taiji program gravitational wave detection parameter estimation machine learning

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Exploring the nature of black hole and gravity with an imminent merging binary of supermassive black holes

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Science China(Physics,Mechanics & Astronomy) 2023年第3期66卷 76-87页

作者： Xingyu Zhong Wen-Biao Han ziren luo Yueliang Wu Shanghai Astronomical Observatory Chinese Academy of SciencesShanghai 200030China Taiji Laboratory for Gravitational Wave Universe(Beijing/Hangzhou) University of Chinese Academy of SciencesBeijing 100049China Hangzhou Institute for Advanced Study University of Chinese Academy of SciencesHangzhou 310124China School of Astronomy and Space Science University of Chinese Academy of SciencesBeijing 100049China Institute of Mechanics Chinese Academy of SciencesBeijing 100190China Shanghai Frontiers Science Center for Gravitational Wave Detection Shanghai 200240China Institute of Theoretical Physics Chinese Academy of SciencesBeijing 100190China International Centre for Theoretical Physics Asia-Paciﬁc University of Chinese Academy of SciencesBeijing 100190China Key Laboratory of Gravitational Wave Precision Measurement of Zhejiang Province Hangzhou 310124China

A supermassive binary black-hole candidate SDSS J1430+2303 reported recently motivates us to investigate an imminent binary of supermassive black holes as potential gravitational wave source, and the radiated gravitational waves at the end of the merger are shown to be in the band of space-borne detectors. We provide a general analysis on the required detecting sensitivity needed for probing such type gravitational wave sources and make a full discussion by considering two typically designed configurations of space-borne antennas. If a source is so close, it is possible to be detected with Taiji pathfinder-plus which is proposed to be an extension for the planned Taiji pathfinder by just adding an additional satellite to the initial two satellites. The gravitational wave detection on such kind of source enables us to explore the properties of supermassive black holes and the nature of gravity.

关键词： gravitation wave SMBHBs Taiji pathfinder

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Research on Telescope TTL Coupling Noise in Intersatellite Laser Interferometry

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Photonic Sensors 2020年第3期10卷 265-274页

作者： Zhi WANG Tao YU Ya ZHAO ziren luo Wei SHA Chao FANG Yukun WANG Shaoxin WANG Keqi QI Yongxian WANG Xuanwen XU Changchun Institute of Optics Fine Mechanics and PhysicsChinese Academy of SciencesChangchun 130033China University of Chinese Academy of Sciences Beijing 100049China Institute of Mechanics Chinese Academy of SciencesBeijing 100190China Jilin University Changchun 130022China

The detection mission of gravitational waves in space is that the accuracy of the long-baseline intersatellite laser interferometry on the million-kilometer order needs to reach the order of 8 pm/Hz.Among all noise sources that affect the interferometry accuracy,tilt-to-length(TTL)coupling noise is the second largest source of noise after shot noise.This paper focuses on studying the contribution of TTL coupling noise of the telescope system in the intersatellite scientific interferometer.By referring to the laser interferometer space antenna(LISA)’s noise budget,TTL coupling noise is required to be within±25μm/rad(±300μrad).Therefore,this paper focuses on studying both the mechanism of TTL coupling noise due to the noise sources of the telescope and the method of suppressing the TTL noise,which can lay a foundation for noise distribution and the development of engineering prototypes in subsequent tasks.

关键词： Intersatellite laser interferometry telescope TTL coupling noise

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Recent Status of Taiji Program in China

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空间科学学报 2022年第4期42卷 536-538页

作者： luo ziren ZHANG Min WU Yueliang Taiji Laboratory for Gravitational Universe University of Chinese Academy of SciencesBeijing 100049 Hangzhou Institute for Advanced Study University of Chinese Academy of SciencesHangzhou 310024 Institute of Mechanics Chinese Academy of SciencesBeijing 100190 International Center for Theoretical Physics Asia-Pacific UCASBeijing100190

The Taiji-1 satellite is a pilot satellite mission of Taiji program,which is used to verify Taiji’s key technology and also to testify the feasibility of Taiji roadmap.Taiji-1 was launched on 31 August 2019 and its designed mission was successfully completed.The in-orbit scientific achievements of Taiji-1 satellite in the first stage have been published and now it has entered the extended task phase.Taiji-2 will prepare all the technology needed by Taiji-3,and remove all the technical obstacles faced by Taiji-3.

关键词： Gravitational wave Taiji program Global gravity field model

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基于MBSE的空间引力波探测系统指标管理及其探测灵敏度分析

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图学学报 2024年第2期45卷 259-267页

作者：朱伊明张玉珠陈斌彭晓东高辰刘宇唐文林强丽娥徐鹏罗子人中国科学院国家空间科学中心北京100190 中国科学院大学计算机学院北京100049 中国科学院力学研究所北京100190 国科大杭州高等研究院浙江杭州310024

为了将空间引力波探测系统论证过程中顶层指标分解与系统级性能分析过程动态关联,提供对空间科学任务全生命周期信息的管理与应用分析能力,提出了基于模型的系统工程(MBSE)的空间引力波探测系统指标管理及其探测灵敏度分析方法。通过系... 详细信息

为了将空间引力波探测系统论证过程中顶层指标分解与系统级性能分析过程动态关联,提供对空间科学任务全生命周期信息的管理与应用分析能力,提出了基于模型的系统工程(MBSE)的空间引力波探测系统指标管理及其探测灵敏度分析方法。通过系统建模语言(SysML)构建空间引力波探测系统指标参数模型,并解析模型内容,筛选和记录指标参数,最后,通过探测灵敏度这一评价空间引力波探测系统探测能力的主要标准,实现空间引力波探测系统对不同科学目标的探测性能分析。结果表明,该方法可统一管理和追溯所有指标内容,为空间引力波探测系统顶层指标论证和系统级性能评价提供了支持。

关键词： MBSE SysML 模型解析引力波探测灵敏度

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A comprehensive simulation of weak-light phase-locking for space-borne gravitational wave antenna

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Science China(Technological Sciences) 2016年第5期59卷 730-737页

作者： DONG YuHui LIU HeShan luo ziren LI YuQiong JIN Gang National Microgravity Laboratory (NML) Institute of Mechanics Chinese Academy of Sciences Beijing 100190 China University of Chinese Academy of Sciences Beijing 100190 China QUEST Centre of Quantum Engineering and Space-Time Research Leibniz Universitat Hannover Hannover 30167 Germany Max-Planck-Institude for Gravitational Physics (Albert Einstein Institute) Hannover 30167 Germany

A comprehensive simulation was performed to better understand the impacts and effects of the additional technical noises on weak-light phase-locking for LISA. The result showed that the phase of the slave laser tracked well with the received transmitting light under different noise level, and the locking precision was limited by the phase readout noise when the laser frequency noise and clock jitter noise were removed. This result was then confirmed by a benchtop experimental test. The required LISA noise floor was recovered from the simulation which proved the validity of the simulation program. In order to convert the noise function into real time data with random characteristics, an algorism based on Fourier transform was also invented.

关键词：相位锁定综合模拟弱光引力波噪声电平天线星载仿真程序

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Principle demonstration of fine pointing control system for inter-satellite laser communication

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Science China(Technological Sciences) 2015年第3期58卷 449-453页

作者： DONG YuHui LIU HeShan luo ziren LI YuQiong JIN Gang National Microgravity Laboratory (NML) Institute of Mechanics Chinese Academy of Sciences University of Chinese Academy of Sciences

Due to high data rates and reliability,inter-satellite laser communication has developed rapidly in these days.However,the stability of the laser beam pointing is still a key technique which needs to be solved;otherwise,the beam pointing jitter noise would reduce the communication quality or,even worse,would make the inter-satellite laser communication impossible.For this purpose,a bench-top of the fine beam pointing control system has been built and tested for inter-satellite laser communication.The pointing offset of more than 100rad is produced by the steering mirror.With beam pointing control system turned on,the offset could be rapidly suppressed to lower than 100 nrad in less than 0.5 s.Moreover,the pointing stability can be kept at 40 nrad for yaw motion and 62 nrad for pitch motion,when the received beam jitter is set at 20rad.

关键词：星间激光通信指向控制系统通信原理卫星间指向稳定性演示波束指向俯仰运动

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Taiji-1 Satellite Mission

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空间科学学报 2020年第5期40卷 691-692页

作者： luo ziren ZHANG Min WU Yueliang Taiji Laboratory for Gravitational Universe University of Chinese Academy of ScienceBeijing 100049 Institute of Mechanics Chinese Academy of ScienceBeijing 100190 International Centre for Theoretical Physics Asia-Pacific University of Chinese Academy of ScienceBeijing 100190

China’s first satellite to conduct experiments on key technologies related to space-based gravitational wave detection,Taiji-1,has successfully completed its in-orbit tests,making a breakthrough in the country’s gravitational wave detection.With the success of Taiji-1’s in-orbit tests,the first goal of Chinese Academy of Science’s three-step strategy to implement the Taiji program has been successfully achieved.

关键词： Gravitational wave Taiji program Drag-free control system

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激光干涉引力波空间阵列核心问题的综合讨论

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科学通报 2019年第24期64卷 2468-2474页

作者：罗子人张敏靳刚中国科学院力学研究所北京100190 中国科学院大学工程科学学院北京100049

空间激光干涉引力波探测计划,例如欧洲航天局主导和美国参加的LISA(Laser Interferometer Space Antenna)计划[1]、中国的“太极”计划[2]和“天琴”计划[3]等,瞄准中低频段(0.1mHz^lHz)的引力波波源.这个频段的引力波事件被认为具有更... 详细信息

空间激光干涉引力波探测计划,例如欧洲航天局主导和美国参加的LISA(Laser Interferometer Space Antenna)计划[1]、中国的“太极”计划[2]和“天琴”计划[3]等,瞄准中低频段(0.1mHz^lHz)的引力波波源.这个频段的引力波事件被认为具有更重要的天文学、宇宙学以及物理学意义[4-6],其典型的波源包括超大(和中等)质量黑洞双星的并合、极端(和中等)质量比黑洞双星的绕转、银河系内数以百万计的致密双星系统以及随机引力波背景等.

关键词：激光干涉引力波空间双星系统欧洲航天局探测计划低频段质量比

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基于模型预测控制的分布式储能型风力发电场惯性控制策略

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上海交通大学学报 2022年第10期56卷 1285-1293页

作者：沈阳武宋兴荣罗紫韧沈非凡黄晟国网湖南省电力有限公司电力科学研究院长沙410000 湖南大学电气与信息工程学院长沙410082

分布式储能型(DES)风力发电机组是解决规模化风力发电接入引起系统频率稳定问题的有效手段.提出一种基于模型预测控制(MPC)的分布式储能型风力发电场惯性控制方法,首先建立分布式储能型风力发电场的线性化预测模型,在此基础上结合MPC控... 详细信息

分布式储能型(DES)风力发电机组是解决规模化风力发电接入引起系统频率稳定问题的有效手段.提出一种基于模型预测控制(MPC)的分布式储能型风力发电场惯性控制方法,首先建立分布式储能型风力发电场的线性化预测模型,在此基础上结合MPC控制框架,设计考虑储能损耗成本和风机转子转速均衡变化的MPC惯性控制优化模型和策略,以实现惯量控制期间风力发电机组转子转速的均衡变化.仿真结果表明:所提控制策略可以有效协调分布式储能型风力发电机组中风力发电单元和储能系统单元的有功功率输出,降低储能系统的充放电损耗成本,并保证风力发电场内所有风机转速在惯性控制期间趋于平均,避免由于风机转速下降过度而导致风力发电机组退出调频的问题.分布式储能型风力发电场惯性控制策略有利于提高电网频率稳定性,对保障电网的安全运行具有重要意义.

关键词：风力发电场惯性控制分布式储能模型预测控制

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