摘要
针对我国卫星测控系统统一S频段(Unified S Band,USB)设备对流层折射误差修正问题,引入了目前在全球卫星导航系统(Global Navigation Satellite System,GNSS)和甚长基线干涉(Very Long Baseline Interferometry,VLBI)等技术领域应用广泛的2种对流层经验映射函数模型:Neill映射函数(Neill Mapping Function,NMF)和全球投影函数(Global Mapping Function,GMF),利用国内4个不同纬度USB设备的实测跟踪数据计算了上述2种模型的距离对流层折射误差,并以基于测站局部探空数据的射线描迹法计算结果为基准,分析了2种模型与基准的偏差以及两模型之间的互差。实测数据的计算结果表明,2种模型完全可应用于USB设备测距对流层折射误差修正;NMF模型和GMF模型在我国中高纬地区的精度优于低纬地区,跟踪仰角大于30°时,所有地区的修正偏差均小于15 cm;NMF模型和GMF模型的距离修正量互差随跟踪仰角的增加而迅速减小,10°以上仰角二者互差小于1 cm。
For the troposphere refractive error correction of USB of satellite TT&C system,two tropospheric empirical mapping functions NMF and GMF that widely used in GNSS and VLBI were used to correct the troposphere refractive error for USB range data from four domestic tracking stations distributing in different latitudes,based on the ray tracing method and local radiosonde data,the precision of two models were evaluated and compared.The results show that:① NMF and GMF can both be used to correct the troposphere refractive error of USB;② the precision of NMF and GMF in middle latitude regions is higher than that in low latitude regions;for the elevation angle is greater than 30°,the precision in both low latitude and middle latitude regions are less than 15 cm;③ the difference of two models is rapidly decreased with the increase of elevation angle and less than 1 cm for elevation greater than 10°.
作者
王丹
淡鹏
WANG Dan;DAN Peng(State Key Laboratory of Astronautic Dynamics,Xi’an 710043,China;Xi’an Satellite Control Center,Xi’an 710043,China)
出处
《无线电工程》
2020年第8期666-671,共6页
Radio Engineering
基金
国家自然科学基金资助项目(61302098)。
