Phase calibration of the EISCAT Svalbard Radar interferometer using optical satellite signatures
2006 (English)In: Annales Geophysicae, ISSN 0992-7689, E-ISSN 1432-0576, Vol. 24, no 9, 2419-2427 p.Article in journal (Refereed) Published
The link between natural ion-line enhancements in radar spectra and auroral activity has been the subject of recent studies but conclusions have been limited by the spatial and temporal resolution previously available. The next challenge is to use shorter sub-second integration times in combination with interferometric programmes to resolve spatial structure within the main radar beam, and so relate enhanced filaments to individual auroral rays. This paper presents initial studies of a technique, using optical and spectral satellite signatures, to calibrate the received phase of a signal with the position of the scattering source along the interferometric baseline of the EISCAT Svalbard Radar. It is shown that a consistent relationship can be found only if the satellite passage through the phase fringes is adjusted from the passage predicted by optical tracking. This required adjustment is interpreted as being due to the vector between the theoretical focusing points of the two antennae, i.e. the true radar baseline, differing from the baseline obtained by survey between the antenna foot points. A method to obtain a measurement of the true interferometric baseline using multiple satellite passes is outlined.
Place, publisher, year, edition, pages
2006. Vol. 24, no 9, 2419-2427 p.
radio science, interferometry, instruments and techniques, ionosphere, auroral ionosphere, field-aligned currents, auroral ionosphere, spectra, instabilities, echoes, system
Astronomy, Astrophysics and Cosmology
IdentifiersURN: urn:nbn:se:kth:diva-16068ISI: 000241281000009ScopusID: 2-s2.0-33751085117OAI: oai:DiVA.org:kth-16068DiVA: diva2:334110
QC 20100525 QC 20111005. 12th Biannual EISCAT International Workshop. Swedish Inst Space Phys, Kiruna, SWEDEN. AUG 29-SEP 02, 2005 2010-08-052010-08-052011-10-05Bibliographically approved