Low Earth orbit (LEO) satellites are a promising type of navigation augmentation satellite for current global navigation satellite systems. Aiming at the navigation function, an effective broadcast ephemeris model needs to be designed for LEO satellites. An enhanced integration-type broadcast ephemeris model is proposed in this study. First, the short-term periodical variation characteristics of LEOs’ accelerations in the Earth-centered Earth-fixed coordinate system are analyzed. The Chebyshev polynomials and harmonic functions are then applied to represent the variation perturbation of accelerations. Tests using simulated and real data from LEO satellites at altitudes from 600 to 1400 km are conducted to evaluate the fit accuracy of the proposed models in terms of arc length, integration method, integration step length, orbital altitude, inclination, eccentricity, etc. The fit accuracy is dramatically improved compared to that of the current GLONASS integration-type broadcast model, where fit errors less than 10 cm are achieved with an arc length of 20 min.

低地球轨道（LEO）卫星是当前全球导航卫星系统中一种很有前途的导航增强卫星。针对导航功能，需要针对低轨卫星设计有效的广播星历模型。本研究提出了一种增强集成型广播星历模型。首先，分析了地心地球固定坐标系中近地天体加速度的短期周期性变化特征。然后应用切比雪夫多项式和调和函数来表示加速度的变化扰动。使用来自 600 至 1400 km 高度的 LEO 卫星的模拟和真实数据进行测试，从弧长、积分方法、积分步长、轨道高度、