GNSS+SINS组合导航在地固系中计算有诸多优点,但GNSS信号缺失时的高度阻尼比较复杂。本文从空间直角坐标系与大地坐标系的关系出发,结合地固系捷联惯导的导航方程,提出了一种地固系高度阻尼算法。经仿真测试证明,应用此算法在地固系高度阻尼,可以达到与导航系相同的效果,证明了算法的有效性。 GNSS + SINS combined navigation has many advantages in georeforming, but the height damping in the absence of GNSS signal is more complicated. Based on the relationship between Cartesian coordinate system and geodetic coordinate system, this paper presents a geo-system height-damping algorithm based on the navigation equation of solid-based SINS. The simulation test proves that this algorithm can achieve the same effect as that of the navigation system by applying the algorithm to dampening the ground at a high level, and the validity of the algorithm is proved.