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    Re: Do We Still Need to Use Sextants?
    From: Richard B. Langley
    Date: 2013 Apr 6, 09:37 -0300

    On 2013-04-05, at 5:48 PM, Frank Reed wrote:
    
    > Does anybody know if "dual band" GNSS jammers already exist? Can nefarious 
    no-goodniks already take out GPS and GLONASS at the same time? I assume the 
    technology is so similar that this is the case. But again, I'm just guessing 
    here.
    
    Some jammers cover both the L1 and L2 bands. If the jamming signals are broad 
    enough, they will also jam GLONASS. See my GPS World Innovation column for 
    January 2012 for some details on "commercial" jammers:
    http://www.gpsworld.com/gnss-systeminnovation-know-your-enemy-12475/
    By the way, spoofing of GPS signals is more insidious than jamming.
    
    > -FER
    > 
    > PS: Or we could place the sensors above the weather! We position very 
    high-altitude drones with GPS and celestial backup every hundred miles or so 
    along major coasts. They report their positions with higher power signals 
    that are difficult to jam. Then ships below could triangulate off that.
    
    Another possibility is to bring back Loran-C, which is far more difficult to 
    jam. The Europeans are doing that with eLoran. See, for example,
    http://www.gpsworld.com/making-europes-seaways-safe-for-enavigation/
    
    And there is a good overview of GNSS (= global navigation satellite systems, 
    the generic term that includes GPS, GLONASS, Galileo, BeiDou, etc.) security 
    here:
    http://www.gpsworld.com/directions-2013-the-future-of-gnss-security/
    
    -- Richard Langley
    
    -----------------------------------------------------------------------------
    | Richard B. Langley                            E-mail: lang---.ca         |
    | Geodetic Research Laboratory                  Web: http://www.unb.ca/GGE/ |
    | Dept. of Geodesy and Geomatics Engineering    Phone:    +1 506 453-5142   |
    | University of New Brunswick                   Fax:      +1 506 453-4943   |
    | Fredericton, N.B., Canada  E3B 5A3                                        |
    |        Fredericton?  Where's that?  See: http://www.fredericton.ca/       |
    -----------------------------------------------------------------------------
    
    

       
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