[time-nuts] Speaking of Costas loops
Dennis Ferguson
dennis.c.ferguson at gmail.com
Fri Jul 5 14:36:45 EDT 2013
On 5 Jul, 2013, at 09:18 , Jim Lux <jimlux at earthlink.net> wrote:
> I believe that the original WAAS repurposed transponders intended for other L-band satellite signals (e.g. Sirius/XM/LightSquared).
I'm not sure. The original WAAS satellites, I think these
http://nssdc.gsfc.nasa.gov/nmc/spacecraftDisplay.do?id=1996-070A
http://nssdc.gsfc.nasa.gov/nmc/spacecraftDisplay.do?id=1997-027A
indeed were commercial L-band satellites, as you suggest, but they still
note that
Each INMARSAT-3 also carried a navigation transponder designed to
enhance the accuracy, availability and integrity of the GPS and
Glonass satellite navigation systems.
which leaves the impression that particular bit of hardware might be
special-purpose.
Dennis Ferguson
More information about the time-nuts
mailing list