yi jing mi dan dian ding wei ji shu gu ji GPS zhui zong zhan zhi jue dui wei yi su du

quan qiu ding wei xi tong Global Positioning System GPS bei guang fan ying yong zai da di kong zhi wang de jian li zhui zong zhan wei yi su du gu ji deng gao jing du de ying yong zhong chuan tong shang wang wang shi yi xiang dui ding wei de fang shi huo de gao jing du zhi zhui zong zhan wei yi du dan suo zhi jie de dao de ye shi ge zhui zong zhan jian de xiang dui su du er yi IGS International GNSS Service chan pin jing mi xing li jing mi shi zhong chan pin ding wei de jing mi dan dian ding wei Precise Point Positioning PPP ji shu ze ju you ke zhi jie huo de zai guo ji can kao kuang jia xia International Terrestrial Reference Frame ITRF de jue dui wei zhi jie deng you shi dan you yu shang shu IGS chan pin wei ge fen xi zhong xin zhi chi yue zhi jie de jia quan ping jun qi yuan dian he di xin zhi jian cun zai cha yi lian dai ying xiang le PPP de ding wei cheng guo yin ci yi PPP suo suan de de zhui zong zhan wei yi su du zhi jing que du ye jiu zhi de tan tao ben yan jiu yi jun yun fen bu quan qiu de 33 ge IGS zhui zong zhan yu 2002 nian zhi 2010 nian de guan ce zi liao yi PPP fang shi gu ji qi wei yi su du bing yu zai ITRF xia de wei yi su du xiang bi