【摘要】 卫星导航定位系统是未来全球性导航、定位的主要手段,又是未来全球精密时间和(?)率发播系统。本文扼要阐述了卫星导航定位系统的进展和前景,并讨论了下列问题:(1)国外卫星导航定位技术发展概况;(2)多站测距、测速体制问题;(3)仿(?)谱的应用问题。更多还原

【Abstract】 The satellite navigation and positioning system will not only be the principle instrument for global navigation and positioning,but also the global precision time and frequency spreading system in the fu- ture.In this paper,a brief introduction aud discussion on its advances and trends are given.It deals with (1) The progress of satellite navigation and positioning technique in the foreign lands; (2)The problem of system selection for multi station distance and velocity measurement; (3)The application of pseudo-code spectrum extension technique.更多还原