Title :
MetOp GRAS: Signal tracking performance results
Author :
Bonnedal, Magnus ; Lindgren, Thomas ; Carlström, Anders ; Christensen, Jacob
Author_Institution :
RUAG Space, Göteborg, Sweden
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;
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
DOI :
10.1109/NAVITEC.2010.5707985
