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前言从1964年以来,美国海军卫星导航系统就开始提供精确的全球定位数据,从来没有间断过,这是一个显著的成就。子午仪目前存在的问题是,定位间隔变化大,人们对它缺乏兴趣。这些问题都需要讨论和解决。本文首先简单地介绍子午仪的一般情况,接着探讨它存在的问题,重点叙述该系统的生存迹象,最后提出解决现存问题的建议。
Preface Since 1964, the United States Navy’s satellite navigation system has provided accurate global positioning data and has never stopped it. This is a remarkable accomplishment. The problem with the meridian is that there is a large variation in the positioning interval and people are not interested in it. These issues need to be discussed and resolved. This article begins with a brief introduction of the general situation of a meridian instrument, then discusses its existing problems, focuses on the survival of the system, and finally puts forward proposals to solve the existing problems.