基于TDICCD空间相机图像模拟源系统设计

空间相机地面检测系统在投入使用之前,必须进行严格的自检功能测试。为了解决测试时与庞大的CCD相机系统对接造成的时间和物力资源浪费问题,本文结合TDICCD空间相机工作原理,设计了一种空间相机图像模拟源系统。本系统通过USB总线进行图像数据的下传,然后经SRAM缓存,并以流水线作业方式下载到FLASH中实现8通道图像数据的固存。并且可实现对相机行频大小、图像大小进行调整的功能,进而模拟不同型号空间相机。实验结果表明,该图像模拟源USB接口的下载速度可达到40 MB/s,空间相机地面检测系统显示的图像与上位机发送的图像一致,无数据丢失和误码的情况。该相机图像模拟源设计灵活,性能稳定可靠,适用范围广。

Design of image simulation system of TDICCD space camera

Space camera ground detection system before being put into service must be carried out self-test function testing strictly. In order to solve the problem of waste of time and resources when testing with the massive CCD camera system, we design a kind of space camera image simulation system based on the working principle of TDICCD space camera. The system obtained the image data through USB bus interface. The image data transfer through the SRAM cache. To realize the permanent storage, the image data are stored in FLASH. This system may realize the change of camera line frequency and image size, so it can simulate different models of space camera. The experimental results show that the speed of data download comes to 40 MB/s from USB interface, and the image display by the space camera ground detection system is consistent with the original image sent by the host computer, without loss of data and error conditions. The camera image simulation system is flexible, stable and reliable performance, wide application range.