| 基于BDS广播星历的卫星坐标拟合精度分析 |
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| 引用本文： | 刘双童,王明孝,杨树文,杨明泽,杨立华.基于BDS广播星历的卫星坐标拟合精度分析[J].全球定位系统,2018,43(3):51-55. |
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| 作者姓名： | 刘双童 王明孝 杨树文 杨明泽 杨立华 |
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| 作者单位： | 1.兰州交通大学 测绘与地理信息学院,甘肃 兰州 730070 |
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| 摘 要： | 针对利用广播星历计算卫星位置时,需反复计算、效率较低的问题。提出利用切比雪夫多项式对广播星历进行卫星轨道拟合,即先计算部分固定时间间隔的卫星坐标作为已知节点,利用不同的拟合阶数,将拟合点与直接法求出的对应点求差,分析其拟合精度。实例表明,只要采取合适的拟合时间间隔和拟合阶数,广播星历拟合精度就可以满足要求。
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| 关 键 词： | BDS 广播星历 切比雪夫多项式 卫星坐标 拟合精度 |
Fitting Accuracy Analysis of Satellite Coordinate Based on BDS Broadcast Ephemeris |
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| Affiliation: | Faculty of Geomatics, Lanzhou Jiaotong University, Gansu Province, Lanzhou 730070, ChinaGansu Provincial Engineering Laboratory for National Geographic State Monitoring, Gansu Province, Lanzhou 730070, ChinaPost-Doctor Research Center of PLA 68029 Troops, Gansu Province, Lanzhou 730020, ChinaLanzhou Precision Sand Table Model Intelligent Manufacturing Co., Ltd., Gansu Province, Lanzhou 730020, China |
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| Abstract: | Aiming at the question of repeated calculations and low efficiency when calculating satellite positions using the broadcast ephemeris,this paper proposes the use of Chebyshev polynomials to fit satellite orbit for broadcast ephemeris by calculating the satellite coordinates of some fixed time intervals as known nodes. Using different fitting orders to find difference between the fitting point and the corresponding point obtained by the direct method and analyzing the fitting accuracy.The examples show that the broadcast ephemeris fitting accuracy can meet the requirements as long as the fitting time interval and the fitting order are taken properly. |
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