GWAC (Ground-based Wide-Angle Camera array) light curve anomaly detection method based on Grubbs criterion and ARIMA

Abstract

The invention discloses a GWAC (Ground-based Wide-Angle Camera array) light curve anomaly detection method based on a Grubbs criterion and ARIMA, which comprises steps: the Grubbs criterion is used to filter the GWAC light curve, and doubtful values are selected; the doubtful values selected through the Grubbs criterion are subjected to stability test, unstable data are subjected to differential to become a stable sequence; the finally-stable data are predicted through an ARIMA model; if a differential sequence is predicted, restoration is carried out, and a prediction value for the doubtful value is obtained; data before the current doubtful value of the sequence are subjected to the same prediction, the average value for prediction errors is solved as a prediction error standard to be compared with the prediction value for the doubtful value, and whether to be an abnormal value for the light curve is finally judged. By adopting the technical scheme of the invention, the light curve formed by brightness of astronomical stars observed by the GWAC is detected, and abnormal stars can be found out.

Description

technical field [0001] The invention relates to an abnormal detection method for GWAC light curve, in particular to a GWAC light curve abnormal detection method based on Grubbs criterion and ARIMA. Background technique [0002] Ground-based Wide-Angle Camera array GWAC (Ground-based Wide-Angle Camera array) is a Chinese-French cooperative gamma-ray burst detection astronomical satellite "Space Multi-band Variable Objects Monitor SVOM (Space Multi-band Variable Objects Monitor, space-based multi-band space variable source monitor) "The key ground equipment. GWAC’s short-time-scale 15-second exposure and large field of view capability generate images on the sky area for us. After point source extraction and cross-certification of the images, time series curves related to light intensity are generated, that is, light curves. [0003] The light curve is an astronomical representation of the brightness change of a celestial body relative to time, and it is a function of brightne...

AI Technical Summary

Problems solved by technology

[0006] In view of the above deficiencies in the prior art, the present invention provides a GWAC light curve anomaly detection method based on the Grubbs criterion and ARIMA to solve the problem of abnormal brightness detection in the GWAC light curve analysis

Images