【作者】 支新军；

【导师】 艾勇；

【作者基本信息】 武汉大学 ， 物理电子学， 2004， 硕士

【摘要】 本论文主要是完成空间光通信PAT系统中信标光光信号的处理，得出信标光的像面位置误差信号，为后续伺服控制系统提供输入信号。根据目前空间光通信对信标光处理子系统提出的高实时性和高精度性的要求以及课题的需要，本论文提出用数字信号处理芯片DSP来解决空间光通信中信标光的像面位置误差信号提取的问题，其优点就是系统体积小、重量轻、功耗低、实时性高、精度高等。通过硬件和软件的有机结合来加速图像的处理。硬件部分主要包括图像采集模块、视频A／D模块、图像数据缓冲模块、接口逻辑控制模块、基于DSP的图像处理模块和电源管理模块等，实现了图像信号的采集、数字化、缓冲和处理。为了提高系统的实时性，做到数据采集和数据处理的并发进行，本论文在硬件上采用了乒乓结构的双FIFO缓冲结构，并且设计了DSP的假读机制简化了双FIFO缓冲结构的逻辑控制电路。软件部分主要包括系统上电复位初始化程序、中断向量表、图像处理核心算法和命令文件，实现了图像数据的预处理和对目标的高速、高精度定位。在图像处理核心算法中积极探讨了针对空间光通信信标光图像特征的目标搜索、阈值分割、目标识别、目标定位和目标跟踪算法。本论文的最后设计了系统的测试模型，给出了测试结果，并对系统的实时性做了精确的评估。更多还原

【Abstract】 A research and design of optical signal processing subsystem in PAT system of space optical communication is proposed in this dissertation. The subsystem can extract the image position error signal of beacon beam that supplies the input signal of the latter serving system. According to the current high real time peculiarity and high precision demands of beacon beam processing subsystem of space optical communication and the requirements of our project, the method that uses digital signal processor (DSP) to solve the image position error signal extraction of beacon beam is proposed in this dissertation. It have the following advantages: the small system volume, the slight weight, the small power, the high real time peculiarity and the high precision and so on. The combination of hardware and software accelerates the image processing. The part of hardware includes mainly the module of image acquisition, the module of video A/D, the module of image buffer, the module of interface logic control, the module of image processing based on DSP and the module of power management. The hardware modules accomplish the image acquisition, digitization, buffer and processing. In order to improve the real time peculiarity of the subsystem and achieve the synchronization of image acquisition and processing, the subsystem adopts double FIFO buffers of pingpong structure, and devises the fake reading mechanism of DSP to simplify the logic control circuit of double FIFO buffers of pingpong structure. The part of software includes mainly the initialization program for resetting, the interruption table, the core algorithm of image processing and command file. The software modules accomplish the image pre-processing and the high speed and high precision locating of beacon beam. The core algorithms of image processing actively research the algorithms including object searching, threshold partition, object recognition, object locating and object tracking. At last, the testing model of the subsystem is devised, and the result is given, furthermore the real time peculiarity of the subsystem is evaluated in the dissertation.更多还原