基于频率采样方法的FIR甲板运动补偿器设计

摘要

The vertical motion of the aircraft carrier is a major cause behind carrier-based aircraft landing error. In order to enhance the landing precision of carrier-based aircraft in high sea state,the automatic carrier landing system incorporates a deck motion compensator to generate the compensation command that corresponds with the vertical deck motion. This command guides the aircraft's tracking motion precisely and reduces the landing error significantly. In most cases,the deck motion compensator can realize the ex⁃pected compensation effect within the compensation frequency region,but it usually induces a high gain re⁃gion outside the compensation range,which amplifies the high frequency component of deck motion and threatens the aircraft flight safety. In order to compensate deck motion effectively and reduce the influence of the high frequency component of deck motion,the frequency response of a discrete deck motion compen⁃sator is designed in this paper through an automatic landing frequency sampling system,and a deck motion compensator with digital Finite Impulse Response(FIR)is also designed by using the frequency sampling method. The simulation results indicate that the proposed FIR deck motion compensator can decrease the aircraft landing deviation effectively.%航空母舰甲板垂向运动是舰载机高海况着舰误差的主要因素，为提高舰载机在高海况下的自动着舰精度，自动着舰系统采用甲板运动补偿器根据甲板垂向运动生成补偿指令，以驱动舰载机精确跟踪甲板运动，从而减少着舰误差。常规甲板运动补偿器在补偿频率范围内虽然可以实现预期补偿效果，但在补偿频率范围外存在高增益区域，对甲板运动中的高频分量起放大作用，并且将其混入生成的补偿指令中，会对舰载机飞行安全产生影响。为在有效补偿的同时减少对甲板运动高频分量的放大作用，通过对舰载机自动着舰系统的频率响应按频率进行采样，设计出离散甲板运动补偿器频率响应，采用频率采样法设计数字式有限冲击响应（FIR）甲板运动补偿器。仿真结果表明：所设计的基于频率采样方法的FIR甲板运动补偿器在有效补偿由甲板运动引起的舰载机着舰误差的同时，可有效降低甲板运动高频分量的影响，提高着舰精度。