I do not see the cited possible problem as realistic, because the GPS signal is so weak it comes in below the noise floor of the GPS receiver, and it is only by way of the processing gain based on the algorithm that the signal is actually received. Only a GPS receiver will be able to do that. Devices which receive GPS signals and retransmit the time/location information do not retransmit in the GPS band, but rather on the COMM or NAV band for which they are designed.
> From: "Pete Perkins" <[email protected]> > Date: Fri, 16 Feb 2007 12:10:30 -0800 > To: "'John Woodgate'" <[email protected]>, <[email protected]> > Subject: RE: Noise canceling headsets & aircraft safety > > All, > > None of the discussion so far had mentioned the potential > interference with GPS signals. This was one of the major factors mentioned > in an IEEE Spectrum article last year. GPS signals are typically > low-level/weak signals looking for a receiver. GPS is being substituted > more and more to replace VOR signals for routing during landing - where any > interference would be more of a problem. Cell phones are now incorporating > GPS devices also. Would anyone know if there could be a cross receiver > interference issue with multiple receivers inhaling the GPS signal and > processing it? > > This forum always provides such a wealth of views on any problem > presented. No wonder we all spend so much time reading this email. > > :>) br, Pete > > Peter E Perkins, PE > Principal Product Safety Engineer > PO Box 23427 > Tigard, ORe 97281-3427 > > 503/452-1201 fone/fax > [email protected] > > > - > ---------------------------------------------------------------- > This message is from the IEEE Product Safety Engineering Society > emc-pstc discussion list. Website: http://www.ieee-pses.org/ > > To post a message to the list, send your e-mail to [email protected] > > Instructions: http://listserv.ieee.org/request/user-guide.html > > List rules: http://www.ieee-pses.org/listrules.html > > For help, send mail to the list administrators: > > Scott Douglas [email protected] > Mike Cantwell [email protected] > > For policy questions, send mail to: > > Jim Bacher: [email protected] > David Heald: [email protected] > > All emc-pstc postings are archived and searchable on the web at: > > http://www.ieeecommunities.org/emc-pstc > - This message is from the IEEE Product Safety Engineering Society emc-pstc discussion list. Website: http://www.ieee-pses.org/ To post a message to the list, send your e-mail to [email protected] Instructions: http://listserv.ieee.org/request/user-guide.html List rules: http://www.ieee-pses.org/listrules.html For help, send mail to the list administrators: Scott Douglas [email protected] Mike Cantwell [email protected] For policy questions, send mail to: Jim Bacher: [email protected] David Heald: [email protected] All emc-pstc postings are archived and searchable on the web at: http://www.ieeecommunities.org/emc-pstc ______________________________________________________________________ This email has been scanned by the MessageLabs Email Security System. For more information please visit http://www.messagelabs.com/email ______________________________________________________________________
