[time-nuts] Spoofing GPS - news article

steve heidmann steveheidmann at yahoo.com
Thu Jun 28 18:02:55 UTC 2012


I can't imagine that we don't sanity check without baro , altimeters . Isn't that the inspiration
for the Kalman filter ?
 

--- On Thu, 6/28/12, J. Forster <jfor at quikus.com> wrote:


From: J. Forster <jfor at quikus.com>
Subject: Re: [time-nuts] Spoofing GPS - news article
To: "Discussion of precise time and frequency measurement" <time-nuts at febo.com>
Date: Thursday, June 28, 2012, 9:53 AM


And not the UAV of the story, I'm sure.

-John

=================


> The picture is not of a Predator, it's a Global Hawk, a much larger
> aircraft.
>
> Didier KO4BB
> On Jun 28, 2012 11:47 AM, "Brooke Clarke" <brooke at pacific.net> wrote:
>
>> Hi Dave:
>>
>> The article shows a photo of a Predator, yet what the UoT guys did was
>> hack a toy helicopter that used only the L1 civilian GPS signal.
>> My guess is that they used a home made 3rd generation GPS simulator with
>> a
>> moderate power amp and antenna.
>> http://www.prc68.com/I/5001A.**html
>> <http://www.prc68.com/I/5001A.html><- first generation single satellite
>> single signal
>> http://www.prc68.com/I/**NTgpsSTR2760.shtml<http://www.prc68.com/I/NTgpsSTR2760.shtml><-
>> second generation multi satellite and multi signal
>>
>> Note that all GPS satellites transmit on the same frequency and so in a
>> sense interfere with each other.
>> But because of the orthogonally of the codes the receiver can process
>> each
>> signal.
>> When a higher power signal is received the "capture" effect eliminates
>> the
>> weaker signals so a high power signal can easily "capture" the receiver.
>>
>> Have Fun,
>>
>> Brooke Clarke
>> http://www.PRC68.com
>> http://www.**end2partygovernment.com/**2012Issues.html<http://www.end2partygovernment.com/2012Issues.html>
>>
>> DaveH wrote:
>>
>>> http://rt.com/usa/news/texas-**1000-us-government-906/<http://rt.com/usa/news/texas-1000-us-government-906/>
>>>  Dave
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>>
>>
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