00870nam0 2200241 450 00002656020090917120531.020090917d1993----km-y0itay50------baengITy-------001yyDifferential GPS explainedan exposè of the surprisingly simple principles behind todays most advanced positioning technologyby Jeff Hurn[Sunnyvale, Calif.]Trimble Navigation19931 v.ill.22 cmDifferential GPS explained43351Astronomia geodetica526.6420Astronomia geodetica e posizionale. Posizione geograficaHurn,Jeff633627ITUNIPARTHENOPE20090917RICAUNIMARC000026560G 526.64/7G 379DSA2009Differential GPS explained43351UNIPARTHENOPE