Aiming at the problems of in-flight initial alignment of the dynamic roll angle for INS/GPS integrated navigation system relying on external measurement or trajectory must be predicable,a dynamic roll angle in-flight initial alignment method based on only GPS information and INS acceleration was proposed.This method used the velocity measured by GPS receiver and the acceleration measured by accelerator to calculate the in-flight dynamic roll angle directly,it was sim-ple and fast,meanwhile large amount of calculation and datum are unnecessary,external sensors are unnecessary.%针对惯性/卫星(INS/GPS)组合系统空中动态启动下初始滚转角给定依赖外部测量或弹道滚转角必须可预测的问题，提出了基于 GPS 测量信息和 INS 测量加速度信息的 INS/GPS 组合系统的空中动态初始滚转角粗对准的方法。该方法利用 GPS 接收机测量速度和 INS 中加速度计测量加速度信息直接解算初始滚转角，充分利用了这两类信息测量精度较高的优点，且算法简单、计算量小、粗对准需要的信息量少和时间短，不需要增加外部传感器。试验结果分析表明，该方法对载体动态运动滚转角粗对准的精度受到载体运动加加速度大小、载体运动攻角和侧滑角大小的影响。为了提高系统的适应性和精度，必须进一步采用高精度非线性模型及滤波算法进行精对准。
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