Assessment of Ground-Based Microwave Radiometry for Calibration of Atmospheric Variability in Spacecraft Tracking
Artikel i vetenskaplig tidskrift, 2014

In a suggested radio propagation experiment using a deep space antenna, accurate calibration of the propagation delay through the Earth’s atmosphere is essential. One or two microwave radiometers can be used for this purpose. Differences in precise locations of the radiometer(s) and antenna to be calibrated leave a residual wet path delay value. We computed the Allan Standard Deviation (ASD) of this residual, as well as the one resulting from different pointing positions in the plane of the sky, by simulations. Pointing offsets, e.g., to avoid solar radiation into the radiometer beam, lead in general to an increased ASD. However, for many observation geometries a deliberate pointing offset can compensate for the location differences. In the case studied we found a reduction of the ASD with up to 45% compared to the ASD obtained for a zero pointing offset. The size of the calculated ASD depends strongly on the model parameters used, e.g., the turbulence strength parameter C_n^2, which has a significant natural variation over a year.

Atmospheric modeling

space exploration.

microwave radiometry

Författare

A. Graziani

Universita di Bologna

Per O. J. Jarlemark

SP Sveriges Tekniska Forskningsinstitut AB

Gunnar Elgered

Chalmers, Rymd- och geovetenskap, Rymdgeodesi och geodynamik

A. Martellucci

ESTEC

M. Mercolino

European Space Operations Centre

P. Tortora

Universita di Bologna

IEEE Transactions on Antennas and Propagation

0018-926X (ISSN)

Vol. 62 5 2634-2641 6746661

Ämneskategorier

Meteorologi och atmosfärforskning

Kommunikationssystem

Fundament

Grundläggande vetenskaper

DOI

10.1109/TAP.2014.2307582