GPS glitch

Frank Gentges fgentges at
Wed Jun 2 13:31:13 CDT 2010

GPS transmits on two frequencies, one at 1575.42 MHz (L1) and the other 
at 1227.60 MHz (L2).

The 1575 MHz signal carries the unencrypted civilian data.

The military uses both L1 and L2 frequencies and can compare position 
fixes to apply a propagation differential correction as well as the 
anitjam processing.  There are probably other things piggybacking on the 
military data stream and I suspect someone added a simple "improvement" 
that obviously did not require a full testing program before going on 
the air live.

But, somewhere they may have overlooked something and *poof* the 
military system did not work.

Frank K0BRA

On 6/2/2010 12:16 PM, andre kesteloot wrote:
> Richard Barth wrote:
>> Sounds like it was the second downlink signal (military and other 
>> high-precision receivers use both, consumer units only one) was 
>> somehow bollixed up.
> I thought the famous wobble had been removed several years ago ?
> André N4ICK
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