12,000

We have over 12,000 students, from over 100 countries, within one of the safest campuses in the UK

93%

93% of Lancaster students go into work or further study within six months of graduating

Home > Research > Publications & Outputs > Two new approaches to spatial interpolation wit...
View graph of relations

« Back

Two new approaches to spatial interpolation with inherent sidelobe suppression for imaging riometers

Research output: Contribution to conferenceOther

Published

Publication date12/2005
Number of pages14
Pages23-36
Original languageEnglish

Conference

ConferenceProceedings of the 31st Annual European Meeting on Atmospheric Studies by Optical Methods and 1st International Riometer Workshop
Period1/01/00 → …

Abstract

Absorption images as obtained by imaging riometers such as IRIS are usually created by interpolating between absorption values for individual beams. For IRIS, the locations of the beam centres serve as grid points for subsequent linear interpolation. Although generally producing good results, the fact that the actual shape of the imaging beams is not considered, potentially introduces errors and can lead to misinterpretations. In this paper, two alternative interpolation methods are introduced. Method A is based on measuring the similarity between simulated reception of individual point sources and actually received data. Method B uses a mathematical model of the sky brightness distribution parametrised by the received data. All interpolation methods are applied to power data, as opposed to absorption data, in order to avoid any errors that might be introduced by intermediate processing steps, especially QDC (quiet-day curve) generation. We apply all methods to synthetically generated test data as well as to three exemplary real datasets which are also compared to a calculated sky brightness distribution obtained from a skymap.