http://www.gpstk.org/foswiki/pub/Documentation/GPSTkPublications/precision-gps-hhstt-ion-gnss-2006.pdf http://www.gpstk.org/foswiki/pub/Documentation/GPSTkPubli

http://www.gpstk.org/foswiki/pub/Documentation/GPSTkPublications/precision-gps-hhstt-ion-gnss-2006.pdf http://www.gpstk.org/foswiki/pub/Documentation/GPSTkPublicat... I think I overstated but still it is possible. Millimeter survey grade is commercial.