基于IEEE1394总线的图像采集处理系统实现

针对卫星激光通信的瞄准捕获跟踪(PAT)系统的图像处理子系统对光信号的检测要求处理速度快,抗干扰能力和实时性强等特点,设计了基于IEEE1394总线的图像采集处理系统来接收CCD传出的图像数据。采用CCD摄像机作为整个系统的光信号探测器,并利用基于IEEE1394总线的图像采集处理系统来接收CCD传出的图像数据。采用了数字信号处理器DSP作为图像处理系统的主控单元,并采用了两片1394芯片分别实现链路层和物理层。对于系统的软件设计,根据角偏差算法的特点,设计处理数据方式为:每采集一个等时数据包就对该数据包进行处理并将结果累加,到下一幅图像传输开始时完成对上一幅图像的处理。经调试,该系统成功应用于卫星激光通信试验系统的激光束位置偏差信号的检测,它具有硬件实现简单,处理速度快,软件升级性好等特点。

Implementation of Image Acquisition and Processing System Based on IEEE 1394 Bus

Since the detect of optical signal in the pointing,acquisition and tracking(PAT) system of intersatellite optical communication(IOC)PAT system requires processing fast and better anti-jamming ability,an image acquisition and processing subsystem is designed.A CCD camera is taken as the optical signal detector of PAT system,and an image acquisition and processing system based on IEEE 1394 bus and DSP is designed,which receives image data of CCD.A Digital Signal Processor(DSP) chip is developed as main controller of the image processing system.Base on IEEE1394 transport protocols,two high-performance general-purpose 1394 chips are used as link-layer controller and physical layer controller.In the software design,for calculating angle position deflection,data processe mode based on single date packet is proposed.Whenever DSP receives a isochronous packet,the packet is processed immedietaly and the result is accumulated.When the transimission of next frame image starts,the last frame image has been processed.Experiment shows that the system successfully realizes the detecting of laser bean position signal in the satellite laser communications.The system hardware is easy to be realized,processe rate is fast,and software is very upgradable.