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<p>The Follow-up X-ray Telescope (FXT) is a primary scientific instrument on board the Einstein Probe (EP) astronomical satellite, which was launched in January 2024. FXT consists of two nested Wolter I-type telescopes (FXT-A and FXT-B) with a focal length of 1600 mm. The focal plane detector utilizes a PNCCD with a resolution of 384<InlineEquation ID="IEq1"> <InlineMediaObject> <ImageObject Color="BlackWhite" FileRef="10686_2025_10006_Article_IEq1.gif" Format="GIF" Height="13" Rendition="HTML" Resolution="72" Type="Linedraw" Width="19" /> </InlineMediaObject> <EquationSource Format="TEX">\(\times \)</EquationSource> <EquationSource Format="MATHML"><math> <mo>×</mo> </math></EquationSource> </InlineEquation>384 pixels. One of the key functions of FXT is to perform the real-time triggering and localization of transients and burst sources. We have developed specialized real-time trigger software that operates within the Payload Data Processing Unit of EP. This onboard software can effectively search for and locate sources, while transmitting source information in real time via the Beidou short message unit and the Very High Frequency (VHF) unit. This paper provides a comprehensive description of the design and development of the onboard software, covering software requirements, module design, and workflow. Additionally, the paper introduces both ground-based and in-orbit testing of this software, and the test results demonstrate that the software meets all design requirements.</p>

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The real-time trigger software of the follow-up X-ray telescope on board the EP satellite

  • 期刊论文

  • 发表日期：

    2025年5月27日

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  • Xiaofan Zhao,
  • Hanyu Ban,
  • Hongbo Cai,
  • Jingjing Xu,
  • Fei Li,
  • Zijian Zhao,
  • Ye Zhang,
  • Weiwei Cui,
  • Hao Wang,
  • Laidan Luo,
  • Wei Li,
  • Yong Chen

摘要

The Follow-up X-ray Telescope (FXT) is a primary scientific instrument on board the Einstein Probe (EP) astronomical satellite, which was launched in January 2024. FXT consists of two nested Wolter I-type telescopes (FXT-A and FXT-B) with a focal length of 1600 mm. The focal plane detector utilizes a PNCCD with a resolution of 384 \(\times \) × 384 pixels. One of the key functions of FXT is to perform the real-time triggering and localization of transients and burst sources. We have developed specialized real-time trigger software that operates within the Payload Data Processing Unit of EP. This onboard software can effectively search for and locate sources, while transmitting source information in real time via the Beidou short message unit and the Very High Frequency (VHF) unit. This paper provides a comprehensive description of the design and development of the onboard software, covering software requirements, module design, and workflow. Additionally, the paper introduces both ground-based and in-orbit testing of this software, and the test results demonstrate that the software meets all design requirements.