摘要：Europe’s second Galileo In-Orbit Validation Element (GIOVE-B) test satellite was launched on April 27, 2008, at 22:16 UTC and began transmissions on May 7.
On the same day, we observed signals in the L1, E5a, and E5b bands, with the L1 spectrum showing multiplexed binary offset carrier (MBOC) modulation. We then identified the generators for the PRN codes in each band, using the approach described in our previous Institute of Navigation (ION) conference papers listed in the Additional Resources section at the end of this article. We revealed these codes to be 13- or 14-stage Gold codes, different from the memory codes in the Galileo Interface Control Document (ICD).
