[time-nuts] New GPS Signals

brooke at pacific.net brooke at pacific.net
Wed Mar 25 16:11:38 UTC 2009


There are three new civilian GPS signals, L1C, L2C and L5.
The original civilian signal, L1 is at 1575.42 MHz (154 * 10 * F0,
F0=1.023 MHz).

L1C is at the same frequency as L1 but uses the code like Japan.

The new L2C signal is at 1227.60 MHz (120*10*F0).  Allowing for path
length corrections.

The new L5 signal is at 1176.45 MHz (115*10*F0).  This is intended for
aircraft safety.  It also has the largest frequency difference to L1 so
should also be the best for determining the path length through the
ionosphere/troposphere allowing for a more accurate time fix.

I'm hoping my Polaris Guide receiver will get upgraded firmware to get
these signals as well as have WAAS added.  See:

Are there any new timing GPS receivers that take advantage of the new

Have Fun,

Brooke Clarke

> Fellow time-nuts,
> GPS IIR-20 was succsessfully launched:
> http://www.losangeles.af.mil/news/story.asp?id=123141115
> Expect it to show up on the receivers eventually. Currently only PRN01
> is unused.
> Cheers,
> Magnus
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