> Yes, what about L5? I thought that was going to be the "new" civilian > frequency that was going to revolutionize GPS. If the FCC is hellbent on > approving Light Squared's request, L5 might be our only option.
IOC level (18) of L5 sending satellites probably available in the 2016-2019 range. FOC (min 24) between 2018 and 2022. We are now used to 30+ working GPS satellites. http://www.gpsworld.com/gnss-system/gps-modernization/future-wave-11401?page_id=7 Of course > the transition would be very nasty and expensive. Regarding nuclear > powered > satellites, I suspect that spy satellites are nuclear powered but since > they > are classified, who knows. Perhaps future GPS satellites with higher > powered > transmitters could be nuclear powered and classified. When did GPSIII studies start? ca 2000? First launch now predicted 2014-15. Lesson: It takes a lot of time to get new shining features up in space. Also consider the new military M-code. "The M-code is a binary-offset-carrier (BOC) signal a split spectrum signal that places most of its power near the edges of the allocated GPS frequency bands, thereby having negligible impact on the legacy signals." http://www.gpsworld.com/gnss-system/gps-modernization/innovation-mboc-signal-options-11721 Looking at the picture in a L1C article http://www.gpsworld.com/files/gpsworld/nodes/2011/11401/L1C-3.jpg You will see the M-code lower band making a nice shield against the evil L^2 for the narrow band civil GPS signal(s). -- Björn _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
