目前高炮应急射击时主要有两种火控诸元求解方法：视在航路法和陀螺仿真法。前者目标航向角、俯仰角对角度测量误差过于敏感；后者则是建立在圆周运动假定下，对于沿直线飞行的目标存在模型误差。针对前述不足，提出了一种新的适用于高炮数字化瞄准具的应急射击诸元求解方法，特点是在目标匀速直线运动假定下，由装定的两个距离光环(指示距离环、开火距离环)求得目标速度和航捷点斜距，再结合瞄准线角速度信息得到瞄准线提前角，最终解算出射击诸元。理论分析表明：一方面，在相同的目标速度误差影响下该方法的提前量误差比视在航路法的提前量误差减小一半，以至于诸元误差对角度测量误差不敏感；另一方面，该方法较陀螺仿真法具有模型优势，模型误差不再是影响射击诸元误差的重要因素。最后，仿真结果证明了该方法的有效性。

At present, there are mainly two methods for solving the fire equation in antiaircraft gun emergency shooting, one is ＂observational trajectory＂ method, and the other is ＂gyro simulation＂ method. The formcr＇s heading and pitch are too sensitive to angle measurement error, and the latter, built up under the circular motion supposition, contains model error for the straight-line flying object. A new method is put forward for solving the fire equation of digital collimator. It is supposed that the target takes uniform motion in a straight line, and then the target＇s velocity and approach point＇s slant-range are estimated by utilizing two distance rings. Furthermore, the LOS advance angle and the firing data can be calculated by utilizing angular velocity. The theoretical analysis shows that： on the one hand, under the same target speed error, the new method＇s initial lead error is only half of the ＂observational trajectory＂ method, so the firing data are not so sensitive to angle measurement error. On the other hand, the new method is superior to the ＂gyro simulation＂ method at model error. Simulation proved the validity of the new method.