航空大气数据参数仿真系统设计
Aeronautical Atmospheric Data Parameters Simulation System Design

大气数据机向飞行器提供实时的高度和空速信息，是飞行器关键的设备。为满足在地面定期校验大气数据机准确性的需求，本文设计了一套航空大气数据参数仿真系统，此系统主要由气路系统、气压传感器、下位机、上位机组成。气路系统包括气泵、电磁比例阀、高频电磁阀、以及储气罐等。气压传感器包括绝压传感器和差压传感器，会实时采集气压数据，并反馈给上位机完成闭环控制。下位机以单片机FM33LE025为核心搭建了电源模块、数模转换模块、PWM输出模块等多个功能电路。上位机将用户输入的设定气压值和传感器采集到的实际气压值生成相应的控制指令，并将其传输至下位机控制气路系统输出满足需求的气压。系统调试后运行稳定，仿真出的静压值和动压值符合测试标准及预期效果，验证了该参数仿真系统的可行性。
The atmospheric data machine is a key component of the aircraft, and it supplies real-time altitude and airspeed information. To satisfy the requirement for regular ground calibration of the atmospheric data machine’s accuracy, the aeronautical atmospheric data parameter simulation systems have been designed. These systems consist of an air circuit system, barometric pressure sensors, a lower computer, and an upper computer. The air circuit system is comprised of an air pump, electromagnetic proportional valves, high-frequency solenoid valves, and storage tanks. The barometric pressure sensors include absolute and different pressure sensors. They are responsible for the real-time collection of air pressure data, which is then fed back to the upper computer to achieve closed-loop control. The lower computer is centered on the MCU FM33LE025, and incorporates several functional circuits, including a power supply module, digital-to-analog conversion module, PWM output module, etc. Control instructions are generated by the upper computer using the user-defined setpoint and sensor-collected pressure data. These instructions are then transmitted to the lower computer for air circuit system regulation, enabling the required air pressure to be produced. Following debugging, stable system operation is confirmed, with simulated static and dynamic pressures verified to comply with test standards and expected outcomes. This confirms the viability of the parameter simulation system.