AI 中文总结
介绍加拿大氢观测站和射电瞬变探测器（CHORD）项目，其采用特定阵列架构，用于多项射电天文研究。吸取CHIME经验，强调波束控制与响应稳定性，已用工程阵列评估性能，探路者阵列在调试，完整阵列2028年投入使用。
AI 中文摘要
加拿大氢观测站和射电瞬变探测器（CHORD）是下一代宽带射电干涉仪，目前正在加拿大不列颠哥伦比亚省的自治领射电天文台建造和调试。CHORD专为精确的21厘米宇宙学、快速射电瞬变发现、谱线星系勘测和脉冲星科学而设计，采用高度冗余的大N、小直径漂移扫描阵列架构。该望远镜由一个512单元的6米碟形天线核心阵列组成，工作在300 - 1500兆赫的漂移扫描模式，还有两个位于哈特溪射电天文台和绿岸天文台的64碟形天线外伸站用于长基线瞬变定位。仪器支持多个同时进行的数字后端用于干涉相关、快速射电暴探测、脉冲星波束形成和高光谱分辨率勘测。CHORD强调精确波束控制和稳定仪器响应，吸取了加拿大氢强度映射实验（CHIME）的经验并大幅提高了灵敏度。已用三碟工程阵列评估了初始性能，目前正在调试64碟形天线探路者阵列，完整阵列将于2028年调试。
英文摘要
The Canadian Hydrogen Observatory and Radio-transient Detector (CHORD) is a next-generation wideband radio interferometer currently being constructed and commissioned at the Dominion Radio Astrophysical Observatory in British Columbia, Canada. CHORD is designed for precision 21\,cm cosmology, fast radio transient discovery, spectral line galaxy surveys, and pulsar science using a highly redundant large-N, small-diameter drift-scan array architecture. The telescope consists of a 512-element core array of 6\,m dishes operating from 300--1500\,MHz in drift-scan mode, together with two 64-dish outrigger stations located at the Hat Creek Radio Observatory and the Green Bank Observatory for long-baseline transient localization. The instrument supports multiple simultaneous digital backends for interferometric correlation, FRB detection, pulsar beamforming, and high spectral resolution surveys. CHORD is designed with an emphasis on precision beam control and stable instrumental response, incorporating lessons learned from the Canadian Hydrogen Intensity Mapping Experiment (CHIME) while providing a substantial increase in sensitivity. Initial performance has been evaluated using a three-dish engineering array, and a 64-dish pathfinder array is currently being commissioned. The full array will be commissioned in 2028.
Comments24 pages, submitted to Proceedings of SPIE 2026
