The paper briefly reviews the guidance laws and their implementation in surface-to-air missiles. The trajectories for the line-of-sight and proportional navigation guidance laws are discussed and the effect of steering on demand for increased lateral acceleration is appreciated. The mathematical model is then evolved to estimate the launch angle of the missile, ie, bearing and elevation, in the direction of the future position of the moving air target as well as the steering commands in pitch and yaw planes in accordance with the proportional navigation guidance law, to enable collision with the target.
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