【作者】 吴创新；

【导师】 李悦丽；

【作者基本信息】 国防科学技术大学 ， 信息与通信工程， 2008， 硕士

【摘要】 采用合成孔径雷达(SAR)可获得远距离高分辨率的雷达图像,并具有全天时、全天候的特性,可以大大提高雷达的信息获取能力,已经在地球遥感、海洋研究、资源勘测及军事侦察等方面得到广泛应用[1][2]。为满足机载合成孔径雷达实时成像中图像实时下传,系统运动补偿和实时控制的要求,本文重点研究了机载SAR实时成像系统中通信控制卡的设计与实现,为图像数据传输和系统控制构建了高性能的、高可靠性的信息处理平台。机载SAR图像具有数据量大,数据率高的特点,成像结果直接传输给遥测系统会给数据下传造成很大的压力,通信控制卡需将图像数据进行压缩后再传输以大大减小下传的数据量,这对通信控制卡的实时信号处理能力提出了很高的要求。此外,机载SAR系统在实时成像过程中需要进行运动补偿,各种运动参数测量设备以及雷达系统的设备都采用串口进行数据传输,给通信控制卡带来了很大的通信压力,需要解决这一通信瓶颈问题。本文主要针对以上两个问题研究了通信控制卡的设计实现。首先,为提高通信控制卡的实时处理能力,采用了ADI公司的高性能DSP芯片ADSP TS201S来实现高速信号处理,并以两片DSP组成分布式并行系统的方式进一步提高板卡的性能;其次,为解决多低速串口与板卡高速处理器的数据通信瓶颈问题,选择专用串口芯片SC16C554,基于FIFO工作模式有效地实现了高速DSP与多路低速串口的高效率数据通信;此外,基于CPCI总线设计了多DSP的通信控制卡,开发了板卡的驱动程序,研究了板卡热插拔功能的设计实现,提出了一种CPCI板卡电源管理的方法;最后实现了机载SAR系统通信控制卡,并对电路的各部分功能进行了调试和测试,验证了该设计的有效性。更多还原

【Abstract】 SAR is a kind of imaging radar, which can acquire high resolution in both range and azimuth direction. It can greatly enhance the ability of information acquirement for its all time and all weather character, so it is widely used in the fields of global remote sensing, ocean research and resource exploration. To meet the needs of image data’s real-time transfer, and real-time control, a communication and control card is introduced in this dissertation, which build a high performance and high reliability platform for image data transform and system control.Airborne SAR image data, with the character of large capacity and high data rate, when it is transmitted directly to the telemetry system, will bring great pressure to the transmission channel. After the communication and control card compresses the image data, the data capacity will reduce in large scale, but it requires high performance processor in the system to process image data. Besides, on the process of imaging, motion compensation is needed. But all sorts of parameter measurement devices and radar system devices transmit data by serial port, which will bring big pressure to the communication system.This dissertation is mainly related to the design and implementation of the communication and control card. Firstly, ADI company’s high performance DSP ADSP TS201S is used in the design to improve the system’s processing performence. Two DSPs which form a parallel system are used to make the system faster. Secondly, to solve the problem of the communication bottleneck between low-speed UART and high speed processors, SC16C554 is used in the design and its FIFO operation mode support a good way to solve this problem. Besides, the card’s driver and hot swap function is developed in this essay, a power management way is bring forward in the end of the essay. After testing and debugging the whole system, the results demonstrate that the card is efficient and reliable.更多还原