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    Re: GPS ground stations
    From: Richard B. Langley
    Date: 2014 May 16, 05:02 -0700

    1. DGPS isn't quite WAAS-like. DGPS is a "local" technique in which pseudorange corrections for common in-view satellites are transmitted regionally to users at LF/MF frequencies. The U.S. DGPS system was expanded some years ago into the NDGPS (Nation-wide DGPS) System. It is still in operation although there is an on-goingreview to determine if it is still needed.
    2. There are 11 "U.S." GPS tracking stations in Russia that may be forced to suspend operations on 1 June according to the statement made by Dmitry Rogozin. Presumably, these are the International GNSS Service stations co-sponsored by NASA's JPL. Right now, there are 22 Russian stations participating in IGS according to the IGS Central Bureau website. It seems Rogozin's statement only applies to the 11 JPL-sponsored ones. A bit more here: http://www.voanews.com/content/russia-threatens-end-to-scientific-cooperation/1915526.html

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    | Richard B. Langley E-mail: lang---.ca |
    | Geodetic Research Laboratory Web: http://gge.unb.ca |
    | 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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