MetOp GRAS: Signal tracking performance results

Author

Bonnedal, Magnus ; Lindgren, Thomas ; Carlström, Anders ; Christensen, Jacob

Author_Institution

RUAG Space, Göteborg, Sweden

fYear

2010

fDate

8-10 Dec. 2010

Firstpage

1

Lastpage

4

Abstract

The GRAS radio occultation instrument on board MetOp has continuously provided measurement data during almost four years. The measurement data are here used as a means to analyze the signal tracking performance of the GRAS instrument. The results demonstrate that the atmospheric Doppler shift is measured to an accuracy of 1.1 mm/s and that the on-board Doppler model is accurate within 4 m/s (or 20 Hz). It is also found that rapid signal amplitude fluctuation, exceeding 10 dB, frequently occur at higher altitudes than expected and that it is possible to improve the signal tracking during such events.

Keywords

Doppler shift; occultations; radio receivers; satellite navigation; satellite tracking; GNSS receiver; GRAS radio occultation instrument; MetOp GRAS; atmospheric Doppler shift; atmospheric sounding; board Doppler model; rapid signal amplitude fluctuation; signal tracking; Accuracy; Atmospheric measurements; Atmospheric modeling; Doppler effect; Extraterrestrial measurements; Instruments; Noise; atmosphere dynamics; performance analysis; radio occultation;

fLanguage

English

Publisher

ieee

Conference_Titel

Satellite Navigation Technologies and European Workshop on GNSS Signals and Signal Processing (NAVITEC), 2010 5th ESA Workshop on

Conference_Location

Noordwijk

Print_ISBN

978-1-4244-8740-0

Type

conf

DOI

10.1109/NAVITEC.2010.5707985

Filename

5707985