基于第一类无奇点根数的LEO历书参数设计

摘要

GNSS技术蓬勃发展,在国防建设和国民经济发展中发挥了重要作用.但也因其无法快速解算整周模糊度、复杂环境下适应性差、完好性差等缺点,限制了其作用的最大发挥.基于LEO通信卫星星座的系统增强可以很好地克服这些缺点.要实现该增强系统,基础之一就是如何生成LEO卫星的历书星历.为解决这个问题,从第一类无奇点出发对GPS标准历书进行改造,提出了一套专用于LEO卫星的10参数历书集,并推导了历书计算公式.对600～1 500 km轨道高度的2～7 d的LEO卫星轨道进行了拟合实验.结果表明,高度600 km时长2d,高度700 km时长4d,高度800 km时长7d历书拟合的用户距离误差(URE)的均方根误差(RMS)分别优于936.021,944.087和956.183 m.%With the development of GNSS technology,it has played an important role in the defense construction and the economic development.But its maximum application is limited because its slow integer ambiguity calculating,poor adaptability under complicated environment and the disadvantage of poor integrity.The enhanced system based on the LEO satellite constellation communication can be very good to overcome these shortcomings.In order to achieve the enhanced system,how to generate the almanac ephemeris is one of the basis.To solve this problem,in this paper,based on the first class of non-singularity variables,the GPS standard almanac is modificated,a set of dedicated to LEO satellite ephemeris set of 10 parameters is put forward,and ephemeris calculation formula is deduced.About 600 to 1 500 km altitude of 2 to 7 days of the LEO satellite orbit fitting experiment is carried out.Results show that root mean square (RMS) of the user range error (URE) of 600 km of 2 days,700 km of 4 days,the height more than 800 km of 7 days ephemeris fitting are better than 936.021,944.087 and 956.183 m respectively.