掠海拖靶高度控制系统

针对掠海恒高拖靶的飞行性能需求,设计了基于ARM7TDMI-S处理器的拖靶嵌入式高度控制系统。首先分析了拖靶在拖带飞行过程中的受力情况,指出对拖靶的控制只需要建立一个高度回路;在此基础上设计了硬件系统,合理分配了系统硬件资源;采用了无线电高度表和加速度计;分别测量拖靶的实时高度和升降速率;利用专用集成芯片驱动舵机工作,达到恒高飞行的目的。为了提高拖靶的高度控制精度和响应速度,设计了基于比例-微分控制的高度控制律,推导出了计算机迭代算法,给出了实时操作系统下嵌入式应用软件的主要任务流程框图。设计了半实物仿真试验,给出了仿真结果,验证了系统设计的正确性和工作的可靠性,满足实际使用要求。

A Height Control System for Sea Skimming Towed Target

An embedded height control system of the towed target was designed based on ARM7TDMI-S processor to fit its low level sea-skimming flight.First force analysis was made to the towed target and it was indicated that the control of the towed target needed only one height control loop.Then the hardware system was designed and its resources were assigned rationally.To keep flight at a constant height a radar altimeter and an accelerometer were used for measuring the real-time height and the vertical velocity and special chips were used for the control of the actuator.The proportional-differential height control law was designed to improve its height-control precision and response speed.The iterative algorithm was derived and the flow chart of the main missions of the embedded application software in the real-time operating system was provided.The correctness of the design and the functional reliability of the system were proved by hardware-in-loop experiments which can meet the requirements of practical use.