NavList:
A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding
Re: Do We Still Need to Use Sextants?
From: Richard B. Langley
Date: 2013 Apr 6, 10:22 -0300
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@unb.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/ | -----------------------------------------------------------------------------
