星载电子设备多余物数据采集系统的设计

　　为实现尺寸较大、内部结构较为复杂的星载电子设备的多余物自动检测，设计了以EZ-USB FX2和CPLD芯片为核心器件的数据采集卡，实现了四通道的同步数据采集和传输。此系统包括数据采集、数据缓存以及数据控制和传输，分别采用了采样率为500 k 的12位A/D转换器件AD7892、16 k×18位的FIFO CY7C4265、EPM7064和USB芯片CY7C68013。重点介绍了数据采集系统的硬件组成和软件设计，包括USB的固件程序、CPLD的控制程序和主机用户程序。实验结果表明，该系统能达到稳定传输速度为15.4 MB/s，保证了四通道同时以500 k的采样率工作的稳定性和正确性。

　　Abstract:

　　In order to implement the remainder auto-detection of large and complex electric equipment in the satellite， a four-channel data acquisition card is designed based on EZ-USB FX2 and the CPLD in the paper. It realizes the function of the synchronous data acquisition and transmission. The system includes data collection， data caching， data control and transmission， respectively using A/D conversion device AD7892 with 12-bit， 500 k sampling rate， 16k×18bit FIFO CY7C4265， EPM7064 and USB chip CY7C68013. This paper focuses on hardware and software design about the data acquisition system， including the USB firmware， CLPD control program and the host user program. Experimental results show that the stable data transmission speed of the system is 15.4MB/s， which ensure the stability and validity.