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Bibliographic Details
Main Authors:	Ding, Jialang, Lin, Guanhong, Zhou, Dejia, Zhang, Jianli, Duan, Ran, Liu, Fei, Ma, Xiaoyun, Zhang, Jie, Liu, Meng, Miao, Chenchen, Liang, Yuan, Liu, Liaoyuan, Zhan, Yingrou, Chu, Yuting, Qiao, Jing, Wang, Wei, Wang, Zerui, Liu, Menquan, Guo, Meng, Li, Di, Wang, Pei, Wang, Xuanyu, Yan, Xiaohui
Format:	Preprint
Published:	2026
Subjects:	Instrumentation and Methods for Astrophysics
Online Access:	https://arxiv.org/abs/2604.20640
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Table of Contents:

We present a Python/CuPy FX software correlator for small radio interferometer arrays and evaluate it on QUEST (Qilu University Explorer Survey Telescope). The system combines multi-threaded data ingest, pinned-memory host-device transfers, GPU-accelerated correlation, Polyphase Filter Bank channelization, MAD-based RFI flagging, and delay/phase calibration in a single workflow aimed at array commissioning. On a single NVIDIA RTX 4090D GPU, the implementation reaches a peak throughput of 1.51 GB/s, which is sufficient for real-time operation in the four-antenna mode tested here. After calibration, the visibility phase across a clean 1.32-1.38 GHz band is flattened to a residual scatter of a few degrees. Using the calibrated visibilities, we form a four-antenna synthesis image of Cassiopeia A; the CLEANed image recovers a compact source at the phase center and reduces image-domain background fluctuations from order 0.1 to a few 0.01 Jy/beam. These results indicate that the software is suitable for small-array commissioning and initial synthesis imaging on QUEST. A GNSS-based beam measurement is included as a supporting commissioning check.

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