Institutional Repository of Computer Application Research Laboratory
| Multisegment Overlap-Save Method for Coherent Dedispersion | |
Zhou, Chenye1; Meng, Qiao1; Liu, Wei2; Guo, Shaocong1; Zhang, Hailong3 ; Li, Gaojing1
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| 2024-12-01 | |
| Source Publication | ASTRONOMICAL JOURNAL
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| ISSN | 0004-6256 |
| Volume | 168Issue:6Pages:254 |
| Contribution Rank | 3 |
| Abstract | Dispersion occurs due to the interstellar medium, which functions as a prism and causes different time delays in radio waves of varying frequencies. The coherent dedispersion technique is often used in pulsar and fast radio burst observations to mitigate this phenomenon. The widely recognized Overlap-Save approach enables this dedispersion algorithm to efficiently perform long linear convolution. However, with the present implementation, the necessary filter length for dedispersion can reach 100 million points or more. The corresponding fast Fourier transform (FFT) points should be larger than this value and a GPU cluster can be used to tackle this demanding process. This study presents the Multisegment Overlap-Save Method (MS-OSM) to effectively address this problem. Our algorithm divides signal bands into separate short segments based on frequency component delays during dedispersion. By using the short segments shuffling technique with the Overlap-Save structure, MS-OSM can greatly reduce the FFT and inverse FFT points required down to fewer than 65,536 points. To evaluate the performance of MS-OSM, a synthetic pulsar signal is created and verified using standard software tools like DSPSR and PRESTO. The results show that MS-OSM maintains the same resolution while reducing execution time and resource usage. The validation of MS-OSM is taken by processing real pulsar observation data. |
| DOI | 10.3847/1538-3881/ad7f58 |
| Indexed By | SCI |
| Language | 英语 |
| WOS Keyword | PULSAR |
| Funding Project | MOST divided by National Key Research and Development Program of China (NKPs)https://doi.org/10.13039/501100012166[2021YFC2203502] ; National Key R&D Program of China |
| WOS Research Area | Astronomy & Astrophysics |
| WOS Subject | Astronomy & Astrophysics |
| WOS ID | WOS:001353910300001 |
| Publisher | IOP Publishing Ltd |
| Funding Organization | MOST divided by National Key Research and Development Program of China (NKPs)https://doi.org/10.13039/501100012166 ; National Key R&D Program of China |
| Citation statistics | |
| Document Type | 期刊论文 |
| Identifier | http://ir.xao.ac.cn/handle/45760611-7/7143 |
| Collection | 计算机技术应用研究室 |
| Corresponding Author | Zhou, Chenye; Meng, Qiao |
| Affiliation | 1.Southeast Univ, Inst RF & OE ICs, Sch Informat & Engn, Nanjing, Jiangsu, Peoples R China 2.Univ Calif Berkeley, Dept Astron, Berkeley, CA USA 3.Chinese Acad Sci, Xinjiang Astron Observ, Urumqi, Xinjiang, Peoples R China |
| Recommended Citation GB/T 7714 | Zhou, Chenye,Meng, Qiao,Liu, Wei,et al. Multisegment Overlap-Save Method for Coherent Dedispersion[J]. ASTRONOMICAL JOURNAL,2024,168(6):254. |
| APA | Zhou, Chenye,Meng, Qiao,Liu, Wei,Guo, Shaocong,Zhang, Hailong,&Li, Gaojing.(2024).Multisegment Overlap-Save Method for Coherent Dedispersion.ASTRONOMICAL JOURNAL,168(6),254. |
| MLA | Zhou, Chenye,et al."Multisegment Overlap-Save Method for Coherent Dedispersion".ASTRONOMICAL JOURNAL 168.6(2024):254. |
| Files in This Item: | ||||||
| File Name/Size | DocType | Version | Access | License | ||
| Zhou-2024-Multisegme（2497KB） | 期刊论文 | 出版稿 | 开放获取 | CC BY-NC-SA | View Application Full Text | |
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