Synthetic direct demodulation method and its applications in Insight-HXMT data analysis
文献类型：期刊论文
| 作者 | Huo, Zhuoxi; Zhang, Yang |
| 出版日期 | 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 |
| 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. |
入库方式： OAI收割
来源：高能物理研究所
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