Optimization of GNSS Receiver for Space Radio Occultation

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M3 Systems’ paper on Optimization of GNSS Receiver for Space Radio Occultation will be presented during ICGPSRO conference in Taiwan.

GPS radio occultation (GPS RO) is a remote sensing technique for atmospheric profiling that improves data availability and complements radiosondes data.
This work aimed at comparing GNSS signals (L1-C/A, E1OS, L5) for the purpose of atmospheric profiling. Performance has been derived taking into account clock quality and antenna gain effects.


Title : Optimization of GNSS Receiver for Space Radio Occultation
Auteurs:  N. Jardak, W. Vigneau, M3 Systems, France; R. Mathieu, F. Barbiero, CNES, Toulouse
Conférence : ICGPSRO 2016: Third International Conference on GPS Radio Occultation in 2016
Date: Wednesday, march 09, 2016
Location: Howard international house, Taipei, Taiwan


ICGSPSRO2016-M3Systems GPS
Resume :
Today’s Radio Occultation (RO) mission receivers are GPS-L1C/A. This is mainly because as part of LEO satellites, RO GNSS receivers must satisfy consumption and dimension constraints and therefore condemned to be low-cost. The literature lacks working about receiver optimization with respect to the key elements which are the GNSS signal, tracking parameters, the antenna gain and the clock quality.

This work aims at optimizing the tracking loops during RO periods. Then, the performance of L1C/A, E1BC and L5 signals are compared in terms of atmosphere profiling. The compliance of the measurements with atmospheric profiling requirements is analysed and its sensitivity to the antenna design and to the receiver clock studied.

This work has led to relevant and practical results. Recommendations were emitted about: the suited signal for atmospheric profiling, whether further antenna design investment is needed and, the choice of the receiver clock. We showed that: 1) the best choice of signal in bending angle retrieval is not the best one for the ionosphere profiling, 2) further improving the antenna design increases the measurement availability in the harsh dynamic region without effect on the compliance to atmosphere profiling and 3) clock stability choice is of utmost importance and improves the compliance.