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速率捷联系统包括惯性组合和弹上计算机两大部份,惯性组合由两个三自由度的速率陀螺和三个加速度表组成,均与飞行器相固连。速率陀螺的输出与飞行器的角速度成正比。速率捷联系统与平台系统一样,用来建立惯性座标系,作为导航计算的基准。要建立惯性座标系,需要给陀螺测量的角速度赋以初值。而发射前飞行器受风的影响产生随机摆动,如何求得飞行器在某瞬间的初始姿态角,就是本文要解决的问题。
The speed strapdown system includes two parts: the inertial combination and the on-board computer. The inertial combination consists of two three-degree-of-freedom rate gyros and three accelerometers, both of which are connected with the aircraft. The output of the rate gyro is directly proportional to the angular velocity of the aircraft. Like the platform system, the rate strapdown system is used to establish an inertial coordinate system as a basis for navigation calculations. To establish an inertial coordinate system, the angular velocity of the gyroscope needs to be assigned an initial value. However, before launching the aircraft, the influence of the wind has a random swing. How to find the initial attitude of the aircraft at an instant is the problem to be solved in this paper.