空间太阳望远镜高速数据传输系统  

High Rate Data Transmission System for Space Solar Telescope

作　　者：耿立红[1] 

机构地区：[1]中国科学院云南天文台,云南昆明650011

出　　处：《云南天文台台刊》2002年第1期68-69,共2页Publications of the Yunnan Observatoty

摘　　要：“空间太阳望远镜”是中国的一项非常重要的天文卫星计划。卫星上将搭载 5个有效载荷 ,在可见光、远紫外、硬X射线、软X射线、Hα和射电波段同时观测太阳 ,其中的主光学望远镜口径达 1m。各有效载荷的CCD器件和其它敏感器件每天采集的科学数据量经过预处理后达 50Gbytes,再由数据压缩系统压缩至 8Gbytes,并储存在海量存储器中。如此庞大的数据量要求空间太阳望远镜的科学数据传输系统以高达 60Mbps的码速率向地面站传送。本文所有的工作均围绕着空间太阳望远镜高速数据传输系统展开 :1 .根据空间太阳望远镜的需求 ,综合研究、分析了它的科学数据传输系统的性能指标和特点 ,并作总体的方案设计 ;2 .设计开发了科学数据传输系统的信道编码和信道解码单元。信道编码单元将把海量存储器中的数据转换为适于QPSK射频调制格式化的串行数据流 ,信道解码单元实现相反的过程 ,文中详细给出了信道编码系统的原理、方法和实验结果。设计中引入了新的设计思想和方法 ,通信协议与现有地面站兼容 ;3 .完成了信道编码、解码环路的地面试验 ,结果表明信道编码、解码系统的技术指标完全符合空间太阳望远镜的要求。在理想无噪声条件下 ,闭环试验数据传输结果无误码 ,数据传输率达 60Mbps,是目前国内科学数据传输系统码速率?The Space Solar Telescope (SST) is a very important astronomical satellite project in China. It will carry on five observing instruments and the main optical telescope with the aperture of 1m to observe simultaneously in different wave bands for the white light, UV light, hard X-ray, soft X-ray, Hα line and radio emission etc. The quantity of the scientific data collected by CCDs and other sensors of the five payloads every day will reach 50 Gbtes. The huge data will be then compressed to about 8 Gbtes by a data compression system and saved in a memory system.Hence it needs to transmit the scientific data down to the satellite ground station at a bit rate of 60Mbps within about 43minutes. In this paper, a high rate scientific data transmission system (DTS) is introduced as follows: Firstly, the DTS is designed and its characteristics are studied and analyzed comprehensively according to the requirements of the SST. Secondly, the Channel Encoding-Decoding unit of the DTS is designed and developed. The Channel Encoding unit will be used to translate the parallel data stored in the memory into two streams of serial formatted data, which are fit for QPSK radio modulation, and the Channel Decoding unit will be used to realize the reversed processes. Some new ideas of communication system are included in the design. And the protocol of this system is completely compatible with that of the existent satellite ground station. Thirdly, ground experiments on the base-band link system of the Channel Encoding-Decoding unit are made. As results, the specifications of the Channel Encoding-Decoding unit have perfectly fulfilled the requirements of the SST, among which no error exists in ideal no-noise situation and the data rate has reached 60Mbps-the highest data transmission rate at present in the satellite scientific data transmission systems in China. Fourthly,the software simulation is an important process to guarantee the scheme design. Several simulations on methods, principles and hardware design are given. At

关 键 词：卫星通信 数据传输 信道编码解码 仿真 空间太阳望远镜 

分 类 号：P111.2[天文地球—天文学]