With the increasing variety and enhancing function of unmanned aerial vehicle(UAV) payload,data recorder,as an important avionics equipment to record UAV flight status and payload information,is also faced with the challenges of increasing recording data,complex working environment and long working hours.The design of a versatile,reliable and accessible data recorder has become an inevitable requirement for the development of the industry.This paper makes improvements to the shortcomings of the traditional UAV data recorder,such as large power consumption,large volume,high cost,low storage efficiency and poor practicability,has firstly transplanted RT-Thread embedded real-time operating system on the STM32F4 microprocessor and the Faffs file system to organize data,with SD card as the storage medium,has secondly put forward a multi-thread and multi-buffer strategy to storage data,has thirdly developed USB drive,making storaged data easily copied from the PC side for offline analysis.Finally,according to the software and hardware design,a small batch trial production is carried out.After the test,data recorder can accurately storage the multi-channel big data stream for a long time.%随着无人机任务载荷的种类日益增多,功能日益强大,数据记录仪作为记录无人机飞行状态和任务载荷信息的重要航电设备,也面临着数据量增大、工作环境复杂、工作时间长的挑战,设计一种多用途、高可靠、易存取的数据记录仪成为行业发展的必然要求.对传统无人机数据记录仪存在的功耗大、体积大、成本高、存储效率低、实用性差的缺点做出改进:在STM32F4微处理器上移植了RT-Thread嵌入式实时操作系统,以SD卡为存储介质,用Fatfs文件系统进行数据组织,创新地提出了多线程数据缓冲存储策略,并且开发了USB驱动,能够从PC端将数据拷出进行离线分析.最后根据软硬件设计进行了小批量试制,经测试能够实现多通道、大数据流输入环境下的长时间准确存储.
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