| 相控阵馈源MVDR波束合成器缓解RFI仿真 |
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| 引用本文： | 尹德江,张立云.相控阵馈源MVDR波束合成器缓解RFI仿真[J].天文学报,2023(1):9-97. |
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| 作者姓名： | 尹德江 张立云 |
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| 作者单位： | 贵州大学物理学院物理与天文系 贵阳 550025;贵安超算中心 贵阳 550025 |
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| 基金项目： | 国家自然科学基金项目(11963002、U1631236), 中国科学院天文大科学研究中心FAST重大成果培育项目, 贵州大学培育项目(201911)资助 |
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| 摘 要： | 相控阵馈源(Phased array feeds, PAFs)接收机作为下一代微波接收机,为大口径射电天文望远镜的射电干扰(Radio Frequency Interference, RFI)缓解工作带来了新的解决方法. PAFs接收机对射电望远镜焦平面的电磁波进行空域采样,返回时域阵列信号,使用最小方差无失真响应(Minimum Variance Distortionless Response, MVDR)波束合成器可以自适应地识别RFI的方向,同时抑制RFI在输出信号中的功率,从而达到提升射电望远镜灵敏度的效果.仿真结果表明MVDR波束合成器对有源高能量的射电干扰有很强的识别能力和一定程度的缓解能力,同时,该波束合成器对各阵元信道中加性噪声累积引起的无源干扰有很强的抑制能力,因此, PAFs接收机的MVDR波束合成器可以增强日益复杂电磁波环境下射电望远镜的抗干扰能力.
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| 关 键 词： | 波束合成器 射频干扰 信号识别 |
| 收稿时间： | 2022/2/3 0:00:00 |
Statistical Analysis of Physical Parameters of Pulsars |
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| YIN De-jiang,ZHANG Li-yun.Statistical Analysis of Physical Parameters of Pulsars[J].Acta Astronomica Sinica,2023(1):9-97. |
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| Authors: | YIN De-jiang ZHANG Li-yun |
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| Institution: | Department of Physics and Astronomy, Guizhou University, Guiyang 550025;Guian Supercomputing Center, Guiyang 550025 |
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| Abstract: | Thanks to the excellent performance of FAST (Five-hundred-meter Aperture Spherical radio Telescope), the number of pulsars has increased rapidly. It is very important to analyze the physical parameters of known pulsars. The overall properties of pulsars are studied by analyzing the related physical parameters such as spatial position, period, surface magnetic flux density and so on. A large number of pulsars were detected by FAST near the galactic disk, which reflect the superiority of its detection ability. The diagram of the relationship between the period and the time derivative of period of pulsars has been updated. At present, 57 pulsars have crossed the classical ``death line'', and five were discovered by FAST. Finally, the physical parameters of the binary pulsar systems are statistically analyzed, the binary pulsar systems are evolving towards the direction of low eccentricity and the decrease mass of the companion star. Moreover, 9 are located above the ``spin-up line''. FAST is making China into the golden age of pulsar discovery, which will further promote the rapid development of pulsar physics. |
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| Keywords: | pulsars: general stars: statistics binaries: general |
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