![Robustness gallery (left to right). Yellow boxes denote detections morphologically classified as linear, while red boxes indicate signals with curvature. (a) Target drifting narrowband track + broadband impulsive transient, with the corresponding MSWNet cleaned map and predicted box. (b) Target + curved interfering track, with the cleaned map and predicted box. (c) Target + quasi-sinusoidally modulated interference, with the cleaned map and predicted box. (d) Target spanning patch boundaries (tiling), with the stitching result across patches. The brightened area is overlapping region and the green box is the equivalent detection obtained after cross-patch stitching. -- [astro-ph.IM]](https://i0.wp.com/astrobiology.com/wp-content/uploads/2026/07/A-Wavelet-1.png?fit=1200%2C672&ssl=1)
[astro-ph.IM] Building on prior FAST targeted and blind SETI campaigns toward 33 exoplanet systems, we introduce a wavelet-integrated search pipeline for narrowband technosignature candidates in radio dynamic spectra.
At its core, the pipeline uses a Multi-Scale Wavelet Net (MSWNet) to produce an interpretable multi-resolution representation, followed by a lightweight parameter estimator for endpoint localization.
Rather than relying solely on hard-threshold drift searches, the pipeline reframes narrowband detection as wavelet-guided feature extraction followed by endpoint regression, morphology-aware filtering, raw-data S/N validation, and multi-beam anticoincidence veto. Applied to real FAST data, the pipeline recovers representative events from prior analyses and produces a compact set of veto-ready candidates for downstream inspection.
The resulting workflow preserves interpretability, low regression complexity, and auditable threshold control, making it readily transferable to other radio surveys and large-scale technosignature searches.
Zi-Qi Li, Jian-Kang Li, Zhe-Wei Luo, Chen-Xu Guan, Yu-Tong Fan, Zhen-Zhao Tao, Xiao-Hang Luan, Bo-Lun Huang, Yu Hu, Peng-Yu Li, Pu-Fan Liu, Kang Jiao, Tong-Jie Zhang, Hai-Yan Zhang, Peng Jiang, Rui Li, Liang Gao
Comments: 19 pages, 10 figures. Resubmitted to AJ after revisions
Subjects: Instrumentation and Methods for Astrophysics (astro-ph.IM)
Cite as: arXiv:2605.23739 [astro-ph.IM] (or arXiv:2605.23739v2 [astro-ph.IM] for this version)
https://doi.org/10.48550/arXiv.2605.23739
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Submission history
From: Zi-Qi Li
[v1] Fri, 22 May 2026 15:13:59 UTC (25,463 KB)
[v2] Tue, 7 Jul 2026 17:32:40 UTC (25,462 KB)
https://arxiv.org/abs/2605.23739
Astrobiology, SETI,
