[time-nuts] iGPS?

[Jim Lux]

On 5/18/15 11:06 AM, Brooke Clarke wrote:
> Hi Bob:
>
> In the link in the message from Brian it explains that iGPS is for
> military users of the Iridium system.
> The key feature is to allow a moving vehicle to lock on the GPS signal
> while being jammed.  They do that and also get a more accurate fix by
> using signals from the Iridium satellites.
>
> I see a potential problem in that the Iridium signals are close in
> frequency to GPS and a broad band jammer might cause a problem for both
> of them.
>


Any system that is concerned about jamming is probably going to be 
immune to broadband jamming: after all, GPS signals are already below 
the noise floor.  Broadband jamming is a pretty ineffective use of RF power.