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March 28, 2026Zhongguo kexue. Wulixue Lixue Tianwenxue0 citations

X/Ka Dual-band Astrometry Based on High-Throughput Correlation Processing Technique

XHXuan HeFSFengchun ShuFTFengxian Tong

Key Points

  • To perform high-precision astrometry using a dual-band X/Ka system and to evaluate the capabilities of a new data processing platform.
  • Conducted 10 VLBI absolute astrometry observations using a 13-meter radio telescope.
  • Built a dedicated domestic data processing platform for high-throughput processing.
  • Utilized a standardized dual-band data processing workflow.
  • Successfully detected 107 out of 108 radio sources observed, including 18 not previously cataloged in ICRF3-XKa.
  • Achieved a median weighted residual time delay of approximately 20 ps, outperforming standard S/X observations.
  • Single calculation accuracy for right ascension and declination averaged 0.64 mas and 0.82 mas, respectively.

Abstract

面向X/Ka双频高精度天体测量与Ka频段深空导航的需求，在国内首次利用13米射电望远镜观测网开展了10次VLBI绝对天体测量，自主搭建了国内首套专用数据处理平台，实现了干涉测量数据吞吐率高达23 Gbps的高通量相关处理，建立了国内首套标准化X/Ka双频数据处理流程。数据处理结果表明，在108颗目标射电源中成功探测到107颗，其中18颗未被ICRF3-XKa射电源表收录，占已探测射电源总数的16.8%，为扩展X/Ka频段天球参考架提供了独有样本。10次观测实验的加权拟后残余时延中位数约为20 ps，优于传统S/X双频观测约25 ps的典型值，并显著优于美国深空网X/Ka双频观测的43.6 ps，射电源赤经和赤纬位置单次解算精度中位数分别为0.64 mas和0.82 mas，表明当前观测条件下我国X/Ka双频天体测量已达到较高精度水平。此外，量化分析了国内观测网Ka频段的探测灵敏度，通过增加积分时间和观测带宽等观测策略，可使当前国内观测网的射电源流量密度探测极限从约0.2 Jy进一步提升至0.1 Jy。观测结果成功验证了我国在X/Ka双频天体测量领域具备自主的观测与高精度数据处理能力，将用于X/Ka频段天球参考架的构建与精化。

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Cite This Study

He et al. (2026) studied this question.

synapsesocial.com/papers/69c771f08bbfbc51511e21a6https://doi.org/10.1360/sspma-2026-0066
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