Axel GARCIA-PENA is an assistant professor with the SIGnal processing and NAVigation (SIGNAV) research axis of the TELECOM team of ENAC (French Civil Aviation University), Toulouse, France, since February 2011. His research interests are GNSS signal and receiver design, GNSS satellite payload analysis and navigation with SoO . He received his double engineer degree in 2006 in digital communications from SUPAERO and UPC, and his PhD in 2010 from the Department of Mathematics, Computer Science and Telecommunications of the INPT (Polytechnic National Institute of Toulouse), France.