shrug-l: GPS - Accuracy Considerations

Wed Jun 22 21:26:40 EDT 2011

Now the lies and finger pointing is starting.  The FCC did not follow standard process in conducting any evaluation and Light Square wanted that way.  They now have a large investment on a product that will not work without interference.  Their new plan will seriously impact precision AG users as well as the survey industry; basically all carrier users. 

Finger pointing:

A claim frequently made by LightSquared spokesperson Jeff Carlisle, and recently by FCC chairman Julius Genachowski, that the GPS industry knew long ago about LightSquared's plan for powerful terrestrial transmitters, would be a telling point — if it were true. But it is not. The verifiable fact is that the GPS industry knew about and agreed to a plan by a previous version of the company, for a different purpose, with a different business concept, and employing a completely different technological approach, one that would not have harmed GPS transmissions and disabled GPS users the way the current plan does. Calling the 2010 LightSquared plan the same as the 2003 Motient plan is running a wolf in sheep's clothing.  

Regards,
Jim Robeson

James M. Robeson
Mapping/GIS Sales, Trimble Certified Trainer  

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-----Original Message-----
From: shrug-l-bounces at lists.dep.state.fl.us [mailto:shrug-l-bounces at lists.dep.state.fl.us] On Behalf Of swarner at gulfcounty-fl.gov
Sent: Wednesday, June 22, 2011 6:22 PM
To: Sykes, John
Cc: shrug-L at lists.dep.state.fl.us; C. Henry Depew
Subject: RE: shrug-l: GPS - Accuracy Considerations

I am by no means an expert on this topic, but I just saw a presentation at
a conference today on this topic, and Light Square says their solution is
to knock the power back 50% on the signal and to also use the lower
frequency of the two proposed bands and hold off on the upper frequency
band closest to the GPS band until a solution can be figured out.  They
claim it will fix all but some Agricultural gps receivers and virutally
have no effect on the rest.  I ask myself "how is this possible"? But
again, I have no expertise in this.  Just wanted to share what I heard
today from a Light Square rep.  
Supposedly, a 350+ page report was released this past Monday to the FCC on
their results of the test in New Mexico but I guess we will all wait and
see what comes of it.  

Scott

On Mon, 20 Jun 2011 09:23:01 -0400, "Sykes, John"
<John.Sykes at dep.state.fl.us> wrote:
> I have been following the LightSquared issue closely for the past few
> months.  LightSquared is developing a broadbrand system for smart
phones,
> I-Pads, etc.  The issue is, basically, that the bandwidth that the FCC
sold
> to LightSquared is immediately adjacent to the GPS L-Band.  Since the
> LightSquared terrestrial stations are planned to be high-powered (at
least
> compared to the GPS satellites at 11,500 miles distance), it completely
> blocks out the L-band GPS signal to civilian receivers (military
receivers
> have anti-jamming features built-in).  Several federal agencies say
these
> plans cannot go forward, as is, including DoD, FAA, NOAA, USCG, etc. 
Also,
> several congressmen and senators have co-signed a letter to the FCC
stating
> that GPS is vital to National Security and the LightSquared system
cannot
> go forward as planned.
> 
> LightSquared had claimed that they had a solution to the GPS problem but
> recent tests indicated that this did not work.  My feeling is that
> LightSquared will not be OK'd to go forward with the proposed system
until
> either; 1) a definite fix to the GPS issue is developed or 2) the FCC
> assigns a different bandwidth to the LightSquared system that does not
> interfere with the GPS system.
> 
> If you subscribe to the CORS newsletter online, it has almost weekly
> articles describing the LightSquared issue and progress towards
resolving
> it.
> 
> -- John
> 
> 
> 
> 
> 
> The Department of Environmental Protection values your feedback as a
> customer. DEP Secretary Herschel T. Vinyard Jr. is committed to
> continuously assessing and improving the level and quality of services
> provided to you. Please take a few minutes to comment on the quality of
> service you received. Copy the url below to a web browser to complete
the
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> http://survey.dep.state.fl.us/?refemail=John.Sykes@dep.state.fl.us Thank
> you in advance for completing the survey.
> 
> From: shrug-l-bounces at lists.dep.state.fl.us
> [mailto:shrug-l-bounces at lists.dep.state.fl.us] On Behalf Of C. Henry
Depew
> Sent: Sunday, June 19, 2011 1:59 PM
> To: shrug-L at lists.dep.state.fl.us
> Subject: shrug-l: GPS - Accuracy Considerations
> 
> Greetings!
>      There is a very interesting article on GPS problems in the July,
> 2011 issue of "Power & MotorYacht" (of all places" starting on page
> 34.  The impact of LightSquared broadcasts on GPS receivers may be of
> interest to you as well as the general discussion of different GPS
> coordinates from different GPS receivers.
> 
> C. Henry Depew
> sisu26 at nettally.com
> 
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