无旋转倾角的NAV/CNAV型GEO广播星历拟合  

GEO NAV/CNAV-type Broadcast Ephemeris Fitting without Rotation of Inclination

作　　者：杜兰[1] 刘泽军 周佩元 方善传 刘利[2] 马高峰[3] 

机构地区：[1]信息工程大学导航与空天目标工程学院,河南郑州450001 [2]北京环球信息应用开发中心,北京100094 [3]信息工程大学地理空间信息学院,河南郑州450001

出　　处：《测绘学报》2017年第3期297-306,共10页Acta Geodaetica et Cartographica Sinica

基　　金：国家自然科学基金(41204022;41374042;U1431115)~~

摘　　要：目前北斗GEO的星历拟合算法和用户卫星位置算法均引进了人为设置的5°倾角旋转,此外,少数星历参数还有超限现象。取消GEO的旋转倾角和抑制参数超限能够统一北斗混合星座的用户算法。基于第一类无奇点根数,分析了无旋转倾角的GEO两步法星历参数拟合算法。讨论了GEO的参数超限原因,提出采用固定1至2个超限参数取值的缩减参数拟合法。北斗GEO卫星在非地影期和地影期的拟合试验表明,拟合成功率和拟合精度能够保证,拟合用户距离误差(URE)的平均值优于3mm;缩减参数拟合法能够抑制特定时段下的参数超限问题,但是拟合URE放大到2cm。The GPS-type broadcast ephemerides are currently used by BDS constellation. However, a 5°-rotation added on the original orbital inclination is needed in the GEOs ephemeris parameters fitting algorithm as well as in the user satellite position computation because of the singularity due to small inclination. Besides, the phenomena of exceeding the given boundary happen occasionally for some ephemeris parameters of GEOs. In order to unify the user ephemerides algorithm for the hybrid constellation, a two-step GEO broadcast ephemerides fitting algorithm was analyzed based on the first class nonsingular orbital elements. After the investigation on the reason for the variations of some ephemeris parameters out of limited range, a reduced fitting parameter set was adopted by giving the underlying one or two parameters with fixed values. Fit simulations for 5 GEOs during both eclipsing and non-eclipsing periods show that the two-step fitting algorithm has considerable robustness to ensure the success rate and fitting accuracy. The mean fitting user range error of GEOs with 2 h for NAV and 3 h data set for CNAV are better than 3 mm. For specific fit arcs with the boundary-exceeding problem, it can be fully avoided by using the fitting algorithm with a reduced fitting parameter set. However, the fitting URE will increase to 2 cm. © 2017, Surveying and Mapping Press. All right reserved.

关 键 词：GEO卫星 广播星历参数 无奇点根数 摄动 用户距离误差 

分 类 号：P228[天文地球—大地测量学与测量工程]