[time-nuts] GPS Interference Question
bownes at gmail.com
Fri Sep 30 14:49:31 UTC 2011
Right. The fixed location apps are not all that hard. But the mobile
ones are going to be a big problem.
Not to mention getting them certified for the application. The GPS you
have in your car is not certified for life critical applications. The
one I have in my ambulance is. And let's not even get into commercial
flight certification. A technical issue, but one verging on politics.
To answer your question #3, it is one of two specific kinds of
attenuator. Generally a band-pass (passes the GPS frequency only) or
notch filter (attenuates the undesired frequency only). As Jim said,
these things don't only impact the desired frequency. For more
information, take a look here:
Short answer, yes it can be done, in a limited set of applications.
Until you reach layer 8.
On Fri, Sep 30, 2011 at 10:02 AM, Marco IK1ODO -2 <ik1odo at spin-it.com> wrote:
> At 15:44 30-09-11, Jason wrote:
>> To filter out the L2 signal, would an actual GPS receiver have to be
>> replaced / modified?
>> Or would a more simple and cheaper alternative be to get a new antenna
>> (with fancy filtering) to replace my existing roof-top
>> antenna and expect all my old equipment to be happy?
> I think that a new antenna/filter/amplifier unit would be ok. But the
> problem is the installed base of receivers, including all those costly units
> used for geodesy or navigation, that have embedded antennas. Those will be
> hard to modify.
> 73 - Marco IK1ODO
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