Sunday, January 27, 2008

Weird results (PRN127 is really GAGAN?)

Nothing special,
just posting some strange acquisition results I've been achieving in Nottingham (UK). How can it be that GAGAN signal (PRN127) was stronger than EGNOS?

Figure 1: INMARSAT 4-F1 (PRN127) orbit data. Courtesy of

Fig. 2: The code search space, definitely an acquisition...

Fig. 3: The SBAS PRNs correlation result hystogram. PRN127 is stronger than PRN120, PRN124, and PRN126?

Fig 4: As a comparison, the GPS PRNs correlation result hystogram...

Fig. 5: And finally, ESA's creature (should I say Surrey's creature maybe?) is still happily transmitting its data... Go Galileo, go!

P.S.: The front-end is this time a Rakon GRM6800 (nice piece of hw believe me).