Optimizing the Co-Design of Message Structure and Channel Coding to Reduce the TTD for a Galileo 2nd Generation Signal

Lorenzo Ortega (1, 2) , Charly Poulliat (1, 3) , Marie-Laure Boucheret (1, 3) , Marion Aubault-Roudier (4) , Hanaa Al Bitar-El Natour (5)

1 IRIT-SC - Signal et Communications
2 TéSA - Télécommunications Spatiales et Aéronautiques - Telecommunications for Space ant Aeronautics
3 Toulouse INP - Institut National Polytechnique (Toulouse)
4 CNES - Centre National d'Études Spatiales [Toulouse]
5 TAS - Thales Alenia Space [Toulouse]

Recently, the joint design of the GNSS message structure and the associated channel‐coding scheme have been investigated as a means to reduce the Time‐To‐First‐Fix (TTFF) and particularly the time to retrieve the Clock and Ephemerides Data (CED). In this context, a new method to co‐design the navigation message and the channel‐coding scheme structure is proposed in this paper. This new co‐design enables us to reduce the time to retrieve the CED while enhancing error‐correction capabilities under degraded channel conditions. In order to fulfill such requirements, some structured coding schemes are designed, which provide both maximum distance separable (MDS) and full diversity properties under a non‐ergodic channel assumption.

Mots clés: Time-To-First-Fix (TTFF); Clock and Ephemerides Data (CED); Message structure; Channel coding; Galileo

Domaines: Traitement du signal et de l'image [eess.SP]

Lorenzo Ortega, Charly Poulliat, Marie-Laure Boucheret, Marion Aubault-Roudier, Hanaa Al Bitar-El Natour. Optimizing the Co-Design of Message Structure and Channel Coding to Reduce the TTD for a Galileo 2nd Generation Signal. Navigation, 2020, 67 (3), pp.471-492. ⟨10.1002/navi.382⟩. ⟨hal-02941370⟩