基于USB的天文图像获取及实时处理系统设计

Design of Astronomical Image Acquisition and Processing System Based on USB

针对某空间目标监视系统的实时目标检测需求,结合所采用CCD相机的接口形式,本文设计并实现了一套基于USB 2.0的高分辨天文图像获取及实时处理系统。首先在深入分析USB 2.0协议的基础上实现了相机数据获取接口,其次结合弱小目标检测算法流程,提出并实现了一种基于DSP+FPGA的可重构实时信息处理机的硬件实现方案。测试结果表明该设计能实现对复杂环境下低信杂比、低对比度的弱小目标的有效检测,并满足探测系统实时性的要求。

Aiming at the real-time processing requirement of one detecting system for space targets, a high resolution astronomieal image acquisition and real-time processing system based on USB 2.0 is designed combining with the interface form of CCD camera. Firstly it thoroughly analyzes the USB 2. 0 protocol and realizes the data interface. Then a project of reconfigurable real-time processor based on DSP＋ FPGA is put forward combining with the flow of dim small target algorithm. The testing results show that the design can realize effective detection of dim small target with low SNR. Furthermore the real-time requirement is satisfied.