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燃气发生器导弹发射系统是由内腔光滑的发射筒、活塞、内环和燃气发生器构成的，位于导弹和发射筒后端之间。活塞的截面积与发射筒的横截面积基本相同。邻近发射筒后端的内环构成燃气从后端排出的喉道，活塞截面积与喉道面积的比Ａｐ／Ａｔ可用与推进剂物理特性有关的函数式表示。
Gas generator The missile launch system consists of a smooth launcher tube, piston, inner ring and gas generator located between the missile and the rear end of the launch tube. The piston cross-sectional area and the cross-sectional area of the launch tube is basically the same. The inner ring adjacent to the rear end of the barrel forms the throat where the gas is discharged from the rear end. The ratio Ap / At of piston cross-sectional area to throat area can be expressed as a function of the physical properties of the propellant.