Machine learning approach to radio frequency interference(RFI) classification in Radio Astronomy
Date
2016-03
Authors
Journal Title
Journal ISSN
Volume Title
Publisher
Stellenbosch : Stellenbosch University
Abstract
ENGLISH ABSTRACT: Radio frequency interference (RFI) presents a large problem for radio telescopes. Interference prevents observations from being made, or extends the duration required for observations. This thesis investigates different methods to automatically classify RFI signals. Data from different sources was cap-
tured at the SKA site. Both Gaussian Mixture Model (GMM) and K-nearest neighbors (KNN) classifiers were used to analyse the data. Both performed adequately, with the KNN slightly outperforming the GMM. Different feature extraction methods were also investigated.
AFRIKAANSE OPSOMMING: Radio frekwensie steurseine verteenwoordig `n groot probleem vir radio tele- skope. Steurseine verhoed teleskope om waarnemings te maak. Hierdie tesis ondersoek verskeie metodes om steurseine automaties te identifiseer en klasi- fiseer. Data van bekende steurseine op die SKA terrein is versamel. Verkeie voorverwerkingtegnieke word ondersoek en dan geannaliseer met bekende sta- tistiese modelle soos `n GMM en KNN. Beide lewer aanvaarbare resultate. Verskeie metodes om kenmerke te onttrek word ook ondersoek.
AFRIKAANSE OPSOMMING: Radio frekwensie steurseine verteenwoordig `n groot probleem vir radio tele- skope. Steurseine verhoed teleskope om waarnemings te maak. Hierdie tesis ondersoek verskeie metodes om steurseine automaties te identifiseer en klasi- fiseer. Data van bekende steurseine op die SKA terrein is versamel. Verkeie voorverwerkingtegnieke word ondersoek en dan geannaliseer met bekende sta- tistiese modelle soos `n GMM en KNN. Beide lewer aanvaarbare resultate. Verskeie metodes om kenmerke te onttrek word ook ondersoek.
Description
Thesis (MEng)--Stellenbosch University, 2016.
Keywords
Radio astronomy, UCTD, Radio -- Interference, Electromagnetic interference, Radio -- Transmitters and transmission, Radio -- Antennas, Radio - Recievers and reception, Radio frequency interference