To solve the accuracy deficiency of simulation operational software for the track computation of a certain type of UAV, this paper proposes a novel track computation approach based on the positive and negative solution formula of ellipse. According to geodetic coordinate system and the geodetic datum related principles, the off-course track of UAV is calculated by using the micro-element analytic method, and the longitude and latitude of flying UAV in the state of a small off-course angle and the constant altitude are calculated by reducing the time interval. Test results indicate that the track of UAV under the circumstance of a small off-course angle can be calculated accurately by using this algorithm, and the track be corrected for some special cases when the UAV flying over the maximum point and/or equator, which can be also available for the off-course track computation of other air vehicles.%针对某型无人机模拟操作软件航迹计算精度存在的不足，提出了一种基于椭圆正反解公式的新的航迹计算方法。根据大地坐标系与大地基准相关原理，利用微元分析法计算无人机偏航航迹，通过缩小时间间隔，计算出等高飞行的无人机在小偏航角情形下的航迹经纬度。仿真验证结果表明，该方法能准确地计算小偏航角状态下无人机的飞行航迹，并能正确地对无人机飞越极点和赤道等特殊情况进行航迹修正，可用于其他飞行器的偏航航迹计算。
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