星敏感器地基评测系统的设计研究

Design and Implementation of a Ground Evaluation System for Star Sensor Camera

为了能够方便、准确地评价星敏感器的成像质量,设计了一款专门用于评价成像质量的图像采集系统。该系统基于PCI总线接口,以FPGA作为核心控制逻辑,用双SRAM的双缓存结构实现了图像数据的大量传输。在软件上采用多线程方法实现了图像的显示和存储,并加入了图像评价模块,从而精确检测出了星敏感器的工作性能。多次严格试验表明,该系统工作稳定、可靠,其采集的图像数据不失真。当系统运行在16位的情况下,其峰值图像传输速率可达到40 Mbps。

To evaluate the imaging quality of a star sensor camera easily and accurately, an image acquisition system for evaluating imaging quality is designed specially. Based on a PCI bus interface, the system takes a FPGA chip as its core control logic and implements the large mass transfer of image data by using a dual SRAM buffer structure. In software, it uses a multithread approach for image displaying and storage and adds in an image evaluating module. So, it can detect the performance of the star sensor camera accurately. Several rigorous test results show that the system can operate stably and reliably and the image data collected are distortionless. When running in the case of 16 bits, the system has its peak image transfer rate up to 40 Mbps.