导弹在高海情条件下掠海飞行,要求高度回路既要有较大的开环传递比,又要有滤除海浪和降低测量误差的能力。采用组合测高方案,导弹平飞高度的变化同时从加速度表和无线电高度表两条支路进入高度控制回路。测高回路带宽一般接近于高度表环节的带宽,其动态响应略优于无线电高度表环节,因此允许高度控制回路刚度略大一些。从单支路进入测高回路的误差或干扰则会被抑制或滤除。导弹平飞高度的稳态精度由无线电高度表保证。经计算、分析,统计出的经验公式方便有效,精度满足工程要求,按此公式选取参数G_2和G_1,其滤海浪环节的动态品质较好,对回路设计无不利影响。仿真试验证实了此设计合理准确,比采用计算机优化设计还要优越。 Missiles flying in the sea under conditions of high sea conditions, requiring a high degree of loop both have a larger open-loop transfer ratio, but also have the ability to filter out waves and reduce measurement errors. Using combined height measurement program, the missile level flight altitude change from the accelerometer and radio altimeter two branches into the height control loop. The height of the altimeters loop is generally close to that of the altimeters, and its dynamic response is slightly better than that of the radio altimeters, thus allowing the rigidity of the height control loop to be slightly larger. Errors or disturbances that enter the altimetry loop from a single leg are suppressed or filtered out. The steady-state accuracy of a missile’s flying height is guaranteed by a radio altimeter. The empirical formula calculated, analyzed and statistically calculated is convenient and effective, and the accuracy meets the engineering requirements. The parameters G_2 and G_1 are selected according to the formula, and the dynamic quality of the filtering ocean wave link is good, which has no adverse effect on the circuit design. The simulation test proves that the design is reasonable and accurate, which is superior to using the computer to optimize the design.