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	Synthetic direct demodulation method and its applications in Insight-HXMT data analysis
	Huo, Zhuoxi; Zhang, Yang
	2018
卷号	620页码:A151
关键词	methods: data analysis methods: numerical techniques: image processing X-rays: general
DOI	10.1051/0004-6361/201732388
英文摘要	Aims. A modulation equation relates the observed data to the object where the observation is approximated by a linear system. Reconstructing the object from the observed data is therefore equivalent to solving the modulation equation. In this work we present the synthetic direct demodulation (synDD) method to reduce the dimensionality of a general modulation equation and solve the equation in its sparse representation. Methods. A principal component analysis is used to reduce the dimensionality of the kernel matrix and k-means clustering is applied to its sparse representation in order to decompose the kernel matrix into a weighted sum of a series of circulant matrices. The matrix-vector and matrix-matrix multiplication complexities are therefore reduced from polynomial time to linear-logarithmic time. A general statistical solution of the modulation equation in sparse representation is derived. Several data-analysis pipelines are designed for the Hard X-ray modulation Telescope (Insight-HXMT) based on the synDD method. Results. In this approach, a large set of data originating from the same object but sampled irregularly and/or observed with different instruments in multiple epochs can be reduced simultaneously in a synthetic observation model. We suggest using the proposed synDD method in Insight-HXMT data analysis especially for the detection of X-ray transients and monitoring time-varying objects with scanning observations.
WOS研究方向	Astronomy & Astrophysics
语种	英语
WOS记录号	WOS:000452732000004
内容类型	期刊论文
源URL	[http://ir.ihep.ac.cn/handle/311005/282251]
专题	硬X射线调制望远镜卫星 高能物理研究所_粒子天体物理中心
推荐引用方式 GB/T 7714	Huo, Zhuoxi,Zhang, Yang. Synthetic direct demodulation method and its applications in Insight-HXMT data analysis[J],2018,620:A151.
APA	Huo, Zhuoxi,&Zhang, Yang.(2018).Synthetic direct demodulation method and its applications in Insight-HXMT data analysis.,620,A151.
MLA	Huo, Zhuoxi,et al."Synthetic direct demodulation method and its applications in Insight-HXMT data analysis".620(2018):A151.

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