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    Re: Do We Still Need to Use Sextants?
    From: Richard B. Langley
    Date: 2013 Apr 6, 10:22 -0300

    On 2013-04-06, at 6:50 AM, Yves Robin-Jouan wrote:
    
    > About jamming, a way to cope with it is to use directive antennas (passive 
    or active devices). It is difficult with MEO satellites like GPS and GNNS 
    ones. But it is easier with GEO satellites like for WAAS or EGNOS 
    augmentation.
    
    Sorry to keep referring to GPS World, but here is a recent article on 
    controlled-reception-pattern GPS antennas:
    
    http://www.gpsworld.com/innovation-getting-control-off-the-shelf-antennas-for-controlled-reception-pattern-antenna-arrays/
    
    -- 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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