Comparing data of two airborne L-band radiometers with different spatial resolution over a heterogeneous land surface

Abstract

This paper describes a first attempt of comparing data of the two airborne L-band radiometers EMIRAD and HUT-2D over land surface. While HUT-2D is an imaging system with a high spatial resolution, EMIRAD delivers data averaged over a relatively large

Detection of a Sea Surface Salinity Gradient Using Data Sets of Airborne Synthetic Aperture Radiometer HUT-2-D and a GNSS-R Instrument

“…Also, for the purpose of resolution enhancement (as in [222]), e.g. the simultaneous measurements of HUT-2D and real aperture EMIRAD (ElectroMagnetic Institute RADiometer) during airborne campaigns in 2008 and 2010 provide interesting datasets [90], [92], [156]. Also, synergies between GNSS-R technology and L-band radiometry continues e.g.…”

“…The main work carried out for the thesis is related to studies of the per- Besides the three publications given above the author has written or contributed to several publications in this context: [85], [87], [89], [90], [104], [105], [124], [133], [156], [167], [176], [178], [92], [202], [203], [204], [205], [206], [207], [208], [209], [210], [211].…”

“…In [Publication VI] an experimental study on the end-to-end performance of the airborne HUT-2D radiometer is presented. There, measurements of several well-known (the galactic pole area, Milky Way, water) or semi- The two latest figures-of-merit have been improved after enhancing the thermal stability by proper modeling of the receivers' equivalent noise temperature behaviour, as reported in [156]. However, those merits are yet in the level of <2 K (1σ) for the image bias and <0.5 K/ • C for the stability and they cannot be claimed spectacular in general radiometry.…”

“…However, this thermal model for the Radio Frequency (RF) parts of the receivers was introduced only after the SMOS soil moisture validation campaign in 2010. During the campaign HUT-2D data was compared with data of another radiometer and the thermal dependency was concluded[156]. External offset visibilities, caused by mutual coupling are subtracted from the visibilities.…”