From Chaos to Clarity: Time Series Anomaly Detection in Astronomical Observations
Document Type
Conference Proceeding
Publication Date
1-1-2024
Abstract
With the development of astronomical facilities, large-scale time series data observed by these facilities is being collected. Analyzing anomalies in these astronomical observations is crucial for uncovering potential celestial events and physical phenomena, thus advancing the scientific research process. However, existing time series anomaly detection methods fall short in tackling the unique characteristics of astronomical observations where each star is inherently independent but interfered by random concurrent noise, resulting in a high rate of false alarms. To overcome the challenges, we propose AERO, a novel two-stage framework tailored for unsupervised anomaly detection in astronomical observations. In the first stage, we employ a Transformer-based encoder-decoder architecture to learn the normal temporal patterns on each variate (i.e., star) in alignment with the characteristic of variate independence. In the second stage, we enhance the graph neural network with a window-wise graph structure learning to tackle the occurrence of concurrent noise characterized by spatial and temporal randomness. In this way, AERO is not only capable of distinguishing normal temporal patterns from potential anomalies but also effectively differentiating concurrent noise, thus decreasing the number of false alarms. We conducted extensive experiments on three synthetic datasets and three real-world datasets. The results demonstrate that AERO outperforms the compared baselines. Notably, compared to the state-of-the-art model, AERO improves the F1-score by up to 8.76% and 2.63% on synthetic and real-world datasets respectively.
Identifier
85200477361 (Scopus)
ISBN
[9798350317152]
Publication Title
Proceedings - International Conference on Data Engineering
External Full Text Location
https://doi.org/10.1109/ICDE60146.2024.00050
e-ISSN
23750286
ISSN
10844627
First Page
570
Last Page
583
Grant
62172423
Fund Ref
Chinese Academy of Sciences
Recommended Citation
Hao, Xinli; Chen, Yile; Yang, Chen; Du, Zhihui; Ma, Chaohong; Wu, Chao; and Meng, Xiaofeng, "From Chaos to Clarity: Time Series Anomaly Detection in Astronomical Observations" (2024). Faculty Publications. 929.
https://digitalcommons.njit.edu/fac_pubs/929
