基于模糊控制的前斜视成像末制导律设计
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摘要
受干扰和目标机动的影响,飞行器在末制导初始时刻相对于目标的位置、速度和姿态存在较大的不确定性。为了确保合成孔径雷达(Synthetic Aperture Radar,SAR)末制导成像效果,要求飞行器成像时具有足够大的前斜角,因此,末制导开始至成像时刻飞行器必须通过弹道机动以满足成像要求。针对该问题,首先建立前斜视制导模型,然后基于以初始时刻的前斜角与成像前斜视角指令偏差绝对值及导数为输入、前斜角指令模式和成像前飞行时间为输出量的模糊控制算法,提出了满足前斜视成像条件的末制导律。数学仿真结果表明,该制导律可保证在偏差条件下前斜视成像条件可达,同时速度损失较小,可提高终端毁伤效应。
Affected by various disturbances and target maneuver, there is a large uncertainty in position, velocity and attitude between the aircraft and the target at the initial time of terminal guidance phase. In order to ensure the imaging effect, the aircraft is required to have a large heading angle when imaging, so that aircraft must be maneuvered to meet the imaging requirements. Aiming at solving this problem, a squint imaging guidance model is firstly established, and then a fuzzy controller is designed based on the absolute value and derivative of deviation between heading angle and heading angle command as input, the command model of heading angle and the flight time before imaging as output, finally a squint imaging terminal guidance law is proposed to meet imaging conditions. The simulation results show that the imaging conditions can be satisfied under the disturbances, but also the flight speed loss is lower and the damage effect can be effectively increased.
Affected by various disturbances and target maneuver, there is a large uncertainty in position, velocity and attitude between the aircraft and the target at the initial time of terminal guidance phase. In order to ensure the imaging effect, the aircraft is required to have a large heading angle when imaging, so that aircraft must be maneuvered to meet the imaging requirements. Aiming at solving this problem, a squint imaging guidance model is firstly established, and then a fuzzy controller is designed based on the absolute value and derivative of deviation between heading angle and heading angle command as input, the command model of heading angle and the flight time before imaging as output, finally a squint imaging terminal guidance law is proposed to meet imaging conditions. The simulation results show that the imaging conditions can be satisfied under the disturbances, but also the flight speed loss is lower and the damage effect can be effectively increased.
引文
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