根据对阿尔卑斯山隧道的研究表明、采用G PS技术代替传统的地面测量法,虽然由于山形复杂和穿越国界使隧道增加了困难,但从精确性、可靠性和经济性三方面来衡量,仍值得推荐。这种予测在当前也是适用的,虽然目前轨道上的G PS卫星星数远比计划的最后星数为少。 According to the study of the Alps tunnel, the use of G PS technology instead of the traditional ground measurement method, although complicated by the mountainous complex and difficult to cross the border to the tunnel, but still worth the three aspects of accuracy, reliability and economy recommend. This prediction is also applicable today, although the current number of G PS satellites in orbit is far less than the planned final number of stars.