Fast Searches for Astronomical Transients Based on Focal-Field Feature Matching

Fast Searches for Astronomical Transients Based on Focal-Field Feature Matching
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基于焦场特征匹配的天文瞬变快速搜索

DOI:
10.1109/lawp.2019.2894790
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发表时间:
2019-01
影响因子:
4.2
通讯作者:
Yang Shizhong
Yang Shizhong
中科院分区:
计算机科学2区
文献类型:
--
作者:
Wu Decheng;Cao Hailin;Fan Jin;Chen Zhoujian;Liu Sheng;Tan Xiaoheng;Yang Shizhong

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由于快速瞬变(例如快速射电爆发)是短持续时间事件,因此望远镜应该需要宽的瞬时视场(FoV)。与传统的波束扫描技术不同,这封信提出了一种使用焦场特征匹配进行瞬态无线电目标检测的新方法。基于抛物面天线反射器的离轴聚焦特性,建立了基于各种入射角度和频率的焦场分布(FFD)数据库。结合瞬态的频率特征,提出了一种改进的多频联合估计压缩感知方法。通过重建索引和FFD特征数据库的关系可以识别瞬变的方向。此外,根据接收到的能量分布,提出了数据库选择方法作为预处理,以降低算法复杂度。使用简化的天线模型来生成 FFD 数据库。仿真结果表明该方法能够准确估计瞬态位置。此外,与传统的多波束扫描系统相比,该方法增加了射电望远镜的视场角,可以提供对瞬变的扩展检测。
Since fast transients such as fast radio bursts are short-duration events, the telescope should require a wide instantaneous field of view (FoV). Unlike the traditional beam-scanning technology, this letter proposes a new approach for transient radio target detection using focal-field feature matching. Based on the off-axis focusing characteristics of the parabolic antenna reflector, the focal-field distribution (FFD) database is established on the basis of various incident angles and frequencies. Combining the frequency feature of the transients, an improved compressed sensing method using the multiple-frequency joint estimation is proposed. The direction of the transients can be identified through the relationship of the reconstructed index and FFD feature database. Moreover, according to the received energy distribution, a database-selection method is proposed as a preprocessing to reduce the algorithm complexity. A simplified antenna model is used to generate the FFD database. The simulation results demonstrate that this approach can accurately estimate the transient position. In addition, compared with the traditional multibeam scanning system, the proposed method increases the FoV of the radio telescope and can provide an extended detection for transients.
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