Premium
Impact of antenna errors on the radiometric accuracy of large aperture synthesis radiometers
Author(s) -
Camps A.,
Bará J.,
Torres F.,
Corbella I.,
Romeu J.
Publication year - 1997
Publication title -
radio science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.371
H-Index - 84
eISSN - 1944-799X
pISSN - 0048-6604
DOI - 10.1029/96rs03198
Subject(s) - remote sensing , radiometry , aperture synthesis , optics , antenna (radio) , antenna aperture , interferometry , radiometer , radiation pattern , astronomical interferometer , computer science , physics , geology , telecommunications
A classification of system errors in aperture synthesis radiometry applied to Earth observation is presented. A general procedure to quantify the impact of antenna errors on the radiometric accuracy is developed and is then particularized to an L‐band Y‐shaped interferometer called MIRAS (microwave imaging radiometer by aperture synthesis) currently under study at the European Space Agency. This work analyzes in detail the impact of antenna errors on the radiometric accuracy of the instrument. These antenna errors are grouped into amplitude and phase antenna pattern errors, antenna position errors and antenna cross polarization errors. Special attention is paid to antenna coupling effects because of their importance in the selection of a suitable inversion algorithm for large aperture synthesis interferometers: the G‐matrix techniques or the Fourier techniques proposed for MIRAS.