Publication Date:
2018-02-09
Description:
Radio frequency interference (RFI) is an ever-increasing problem for remote sensing and radio astronomy, with radio telescope arrays especially vulnerable to RFI. Localising the RFI source is the first step to dealing with the culprit system. In this paper, a new localisation algorithm for interferometric arrays with low array beam sidelobes is presented. The algorithm has been adapted to work both in the near-field and far-field (only the direction of arrival can be recovered when the source is in the far-field). In the near-field the computational complexity of the algorithm is linear with search grid size compared to cubic scaling of the state-of-the-art 3D MUSIC method. The new method is as accurate as 3D MUSIC. The trade-off is that the proposed algorithm requires a once-off a priori calculation and storing of weighting matrices. The accuracy of the algorithm is validated using data generated by LOFAR (Low Frequency Array) while a hexacopter was flying around it and broadcasting a continuous-wave signal. For the flight, the mean distance between the differential GPS positions and the corresponding estimated positions of the hexacopter is 2 m at a wavelength of 6.7 m.
Print ISSN:
0048-6604
Electronic ISSN:
1944-799X
Topics:
Geosciences
,
Physics
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