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人们永远生活在特定时空之中,对于时间和空间位置信息的需求可谓与生俱来。卫星导航技术正好满足了人们对时空信息的需求,因而成为人类社会重要的基础设施。利用空中的导航卫星,卫星导航系统对地面、海洋、大气层以及太空中的用户提供高精度的时间和位置信息。它所提供的位置与时间服务应用于经济、国防、科技、社会等各个领域,如信息、海洋、环保、测绘、交通、铁路、航运、农业、林业等。其
People always live in a specific space and time, the demand for information on the location of time and space can be described as innate. Satellite navigation technology just meets people’s demand for space-time information and thus becomes an important infrastructure for human society. Using aerial navigation satellites, satellite navigation systems provide high-precision time and location information to users in the ground, in the sea, in the atmosphere, and in space. It provides the location and time services applied to various fields such as economy, national defense, science and technology, society, such as information, marine, environmental protection, surveying and mapping, transportation, railway, shipping, agriculture and forestry. its