Semi-Supervised Novelty Detection with Adaptive Eigenbases, and Application to Radio Transients

author: Kiri L. Wagstaff, Machine Learning and Instrument Autonomy Group, Jet Propulsion Laboratory, California Institute of Technology (Caltech)
produced by: NASA Ames Video and Graphics Branch
published: June 27, 2012,   recorded: October 2011,   views: 2830
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Description

We present a semi-supervised online method for novelty detection and evaluate its performance for radio astronomy time series data. Our approach uses adaptive eigenbases to combine 1) prior knowledge about uninteresting signals with 2) online estimation of the current data properties to enable highly sensitive and precise detection of novel signals. We apply the method to the problem of detecting fast transient radio anomalies and compare it to current alternative algorithms. Tests based on observations from the Parkes Multibeam Survey show both e ective detection of interesting rare events and robustness to known false alarm anomalies.

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