Radio-frequency interference mitigating hyperspectral L-band radiometer release_oi3mjqhr3ffb3gjk4gyagv5qdm

by Peter Toose, Alexandre Roy, Frederick Solheim, Chris Derksen, Tom Watts, Alain Royer, Anne Walker

Published in Geoscientific Instrumentation, Methods and Data Systems by Copernicus GmbH.

2017   p39-51

Abstract

<strong>Abstract.</strong> Radio-frequency interference (RFI) can significantly contaminate the measured radiometric signal of current spaceborne L-band passive microwave radiometers. These spaceborne radiometers operate within the protected passive remote sensing and radio-astronomy frequency allocation of 1400–1427<span class="thinspace"></span>MHz but nonetheless are still subjected to frequent RFI intrusions. We present a unique surface-based and airborne hyperspectral 385 channel, dual polarization, L-band Fourier transform, RFI-detecting radiometer designed with a frequency range from 1400 through  ≈ <span class="thinspace"></span>1550<span class="thinspace"></span>MHz. The extended frequency range was intended to increase the likelihood of detecting adjacent RFI-free channels to increase the signal, and therefore the thermal resolution, of the radiometer instrument. The external instrument calibration uses three targets (sky, ambient, and warm), and validation from independent stability measurements shows a mean absolute error (MAE) of 1.0<span class="thinspace"></span>K for ambient and warm targets and 1.5<span class="thinspace"></span>K for sky. A simple but effective RFI removal method which exploits the large number of frequency channels is also described. This method separates the desired thermal emission from RFI intrusions and was evaluated with synthetic microwave spectra generated using a Monte Carlo approach and validated with surface-based and airborne experimental measurements.
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