[aprssig] GPS possible disruption SE US Jan 20 - Feb 22

[mwbesemer at cox.net]

That is possible, and could probably be implemented via the WAAS system, 
in areas that are augmented by WAAS.

However, keep in mind that either jamming or offsetting GPS for aviation 
or maritime customers would be relatively ineffective due to the fact 
that those platforms are required to have redundancy in their navigation 
systems via another source.  (GPS backed by INS, DNS, Omega, LORAN, 
etc.)  Also, when near or over land, VORTACs are available for aircraft 
use (although they could be shut off in case of emergency).

Consider, however, the case of smart-munitions.  Those that are 
GPS-guided (are likely to) go into a fail-safe mode if GPS guidance was 
completly disrupted (jammed).  This mode might result in the 
self-destruction of the weapon or in the safeing of the weapon 
(rendering it non-explosive, although you still would not want it 
landing on your house).

I'm only speculating on all of this (of course) but I did spend the 
majority of the past 30 years doing RT&E/DT&E with the military.  Most 
likely, we will NOT hear anything specific regarding the results/purpose 
of this test (unless Wikileaks gets a hold of it!) for the next 25 years 
or so.  There are some things that the public really doesn't need (or 
want) to know about.

73,

Mike
WM4B




On Thu, Jan 20, 2011 at 12:03 PM, Lynn W. Deffenbaugh (Mr) wrote:

> But with a jammer, the receiver knows they don't have a fix and 
> something's up.  I'm more thinking an experimental scrambler/offsetter 
> that allows GPS receivers within the cone of influence to arrive at a 
> solution based on the received signals and generate fix, but they 
> really aren't at the location the fix describes.  And the GPS consumer 
> won't know that they're being mis-lead (literally!).
>
> Lynn (D) - KJ4ERJ - Author of APRSISCE for Windows Mobile and Win32
>
> mwbesemer at cox.net wrote:
>> Nope... you're thinking about it from the wrong angle.
>>
>> Ever heard of a GPS Jammer?
>>
>> Mike
>> WM4B
>>
>>
>> On Thu, Jan 20, 2011 at 11:36 AM, Gregg Wonderly wrote:
>>
>>> It sounds like a transmitter at 40,000ft that might be a "relay" of 
>>> existing GPS data.  Perhaps they are trying to figure out how to 
>>> make GPS work on the ground in cities with tall buildings?
>>>
>>> Gregg
>>> w5GGW
>>>
>>> On 1/20/2011 9:15 AM, Earl Needham wrote:
>>>> I'm just wondering what they're doing that might disrupt GPS...
>>>>
>>>> Vy 7 3
>>>> Earl
>>>> KD5XB
>>>>
>>>> KD5XB -- Earl Needham http://groups.yahoo.com/group/cw_bugs Quoting 
>>>> from the Coast Guard: ZUT Posted via Blackberry
>>>>
>>>> -----Original Message-----
>>>> From: Steve Noskowicz<noskosteve at yahoo.com>
>>>> Sender: aprssig-bounces at tapr.org
>>>> Date: Thu, 20 Jan 2011 07:12:37
>>>> To: TAPR APRS Mailing List<aprssig at tapr.org>
>>>> Reply-To: TAPR APRS Mailing List<aprssig at tapr.org>
>>>> Subject: Re: [aprssig] GPS possible disruption SE US Jan 20 - Feb 
>>>> 22
>>>>
>>>>
>>>> --- On Lynn W. Deffenbaugh (Mr)  wrote:
>>>>> ... I was looking for the coordinates that I could understand ...
>>>>>   Lynn (D) - KJ4ERJ -
>>>>
>>>> -   -   -   -   -   -
>>>>
>>>> I often say that... "Can you explain that in terms I know?" (;-)
>>>>
>>>> 304906N = 30.4906 Deg North
>>>>
>>>> 0802811W = 80.2811 Deg West
>>>>
>>>> Google maps finds it A-OK.
>>>>
>>>> If you'd like it, I have an Excel spreadsheet that does conversions 
>>>> between all forms of these.  That is:
>>>> 1 - Degrees.decimal   (As shown above)
>>>> 2 - Degrees,  Minutes.decimal
>>>> 3 - Degrees,  Minutes,  Seconds.decimal
>>>>
>>>> Contact via my web site or MYCALL at arrl.net
>>>>
>>>>
>>>
>>>
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>>
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