摘要
分析了脉冲星相位观测量的特点,介绍了采用单差、先双差后单差、航天器钟差辅助检验等三种模糊度搜索方法。利用仿真数据对比了三种方法检验的效果。通过计算,先双差后单差检核方法明显优于单差检核的方法。解算航天器钟差同样可起到辅助检核的作用,提高模糊度搜索的成功率。模糊度搜索受时间误差、脉冲星位置误差的影响较小,受相位误差影响较大。进行模糊度搜索时,在寻求较少模糊度组合数的同时,应优选几何结构好、测距误差小的脉冲星组合。
In this paper the characteristics of pulsar phase measurements are analysed. Three ambiguity searching methods are introduced. The first one only use single-difference measurements. The second one use first double and then single difference measurements. The third one use spacecraft clock offset combined with the single-difference measurements. Using simulation data the three methods are contrasted. Through calculation the second method is more useful than the first one. Clock offset also can help improving the ratio of succeed. The influences of clock offset, pulsar position error are small. And the influences of phase error are large. When we seek small ambiguity combination number, we should better select pulsars which have good geometry distribution and small range measurement error.
出处
《宇航学报》
EI
CAS
CSCD
北大核心
2009年第2期510-514,共5页
Journal of Astronautics
关键词
脉冲星导航
模糊度
搜索空间
Pulsar navigation
Ambiguity
Searching space
