基于卫星位置与速度的北斗卫星广播星历拟合

提出基于卫星位置与速度的广播星历拟合算法，给出了该拟合算法的计算过程，并对传统坐标拟合算法与坐标+速度拟合算法的拟合精度及外推精度进行比较.结果表明：基于位置+速度的拟合算法是有效的，且与传统坐标拟合算法相比，该算法能显著提高拟合的速度精度，且坐标精度也略有提高.此外，在卫星轨道数据已知历元数较少时，采用坐标+速度拟合算法优势更明显.
A new fitting method based on both the position and the velocity of satellite is presented in this paper and a fitting formula is deduced. Then, the fitting and the extrapolating accuracy are compared between conventional position based fitting method and the new position velocity based fitting method. Compared with conventional fitting method, the new fitting method shows a significant improvement in velocity accuracy, with a slight improvement in position accuracy. Besides, the new method’s advantage is more obvious when the fitting epoch is few