Multisegment Overlap-Save Method for Coherent Dedispersion
文献类型：期刊论文
| 作者 | Zhou, Chenye1; Meng, Qiao1; Liu, Wei3; Guo, Shaocong1; Zhang, Hailong2 ; Li, Gaojing1
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| 刊名 | ASTRONOMICAL JOURNAL
 |
| 出版日期 | 2024-12-01 |
| 卷号 | 168期号:6页码:254 |
| ISSN号 | 0004-6256 |
| DOI | 10.3847/1538-3881/ad7f58 |
| 产权排序 | 3 |
| 英文摘要 | 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. |
| WOS关键词 | PULSAR |
| 资助项目 | 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研究方向 | Astronomy & Astrophysics |
| 语种 | 英语 |
| WOS记录号 | WOS:001353910300001 |
| 出版者 | IOP Publishing Ltd |
| 资助机构 | 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 |
| 源URL | [http://ir.xao.ac.cn/handle/45760611-7/7142]  |
| 专题 | 新疆天文台_计算机技术室 |
| 通讯作者 | Zhou, Chenye; Meng, Qiao |
| 作者单位 | 1.Southeast Univ, Inst RF & OE ICs, Sch Informat & Engn, Nanjing, Jiangsu, Peoples R China 2.Chinese Acad Sci, Xinjiang Astron Observ, Urumqi, Xinjiang, Peoples R China 3.Univ Calif Berkeley, Dept Astron, Berkeley, CA USA |
| 推荐引用方式 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. |
入库方式： OAI收割
来源：新疆天文台
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