如何构建空间攻防网络是空间作战的一项关键技术。深入分析研究了CCSDS分包遥测、分包遥控、AOS建议及主网模型,提出了基于IP over CCSDS的空间攻防网络设计概念,分析和选择了相关的数据交换协议,构建了空间网络与地面网络端到端通信网...如何构建空间攻防网络是空间作战的一项关键技术。深入分析研究了CCSDS分包遥测、分包遥控、AOS建议及主网模型,提出了基于IP over CCSDS的空间攻防网络设计概念,分析和选择了相关的数据交换协议,构建了空间网络与地面网络端到端通信网络协议栈模型,并对CCS-DS技术在我国航天测控通信网中的应用提出了改造建议和应用思路。展开更多
CCSDS为空间数据在地面的传输提出了标准的传输协议——空间链路扩展(Space Link Extension)协议。目前,国际上已有多个航天组织利用此协议搭建SLE传输系统开展合作,但当前的传输系统在一些情况下并不是十分可靠,出现了诸如测站系统复...CCSDS为空间数据在地面的传输提出了标准的传输协议——空间链路扩展(Space Link Extension)协议。目前,国际上已有多个航天组织利用此协议搭建SLE传输系统开展合作,但当前的传输系统在一些情况下并不是十分可靠,出现了诸如测站系统复杂度过高,多测站同时执行任务时数据冗余量大,系统传输过程中发生故障难以及时恢复以及高速数据传输过程中遇到资源瓶颈等问题。阐述构建可靠SLE系统的意义,通过对在SLE传输任务中遇到的问题的分析,从系统配置策略、传输任务中物理和逻辑主备策略及高速数据拆分策略三个方面提出高可靠CCSDS SLE系统的设计方案。展开更多
Deep space communication is quite different from conventional ground communication due to its time-varying,complexity and large signal delay,which consequently affects communication quality and system efficiency.Adjus...Deep space communication is quite different from conventional ground communication due to its time-varying,complexity and large signal delay,which consequently affects communication quality and system efficiency.Adjusting the transmission parameters when the channel environment changes during the communication can guarantee the performance index of the system,and therefore improve communication efficiency. An adaptive transmission scheme of transceiver based on Consultative Committee for Space Data Systems(CCSDS)protocols is proposed in this paper. According to the variation of the deep space channel,the symbol rate of transmission data is adjusted dynamically by estimating the signal-to-noise ratio(SNR) of the receiver in real time and adjusting the channel environment. This scheme can improve the channel utilization and system throughput under the premise of limiting the system bit error rate. Furthermore,this scheme is successfully implemented in Xilinx Virtex-5 FPGA board.展开更多
Multispectral time delay and integration charge coupled device （TDICCD） image compression requires a low- complexity encoder because it is usually completed on board where the energy and memory are limited. The Cons...Multispectral time delay and integration charge coupled device （TDICCD） image compression requires a low- complexity encoder because it is usually completed on board where the energy and memory are limited. The Consultative Committee for Space Data Systems （CCSDS） has proposed an image data compression （CCSDS-IDC） algorithm which is so far most widely implemented in hardware. However, it cannot reduce spectral redundancy in mukispectral images. In this paper, we propose a low-complexity improved CCSDS-IDC （ICCSDS-IDC）-based distributed source coding （DSC） scheme for multispectral TDICCD image consisting of a few bands. Our scheme is based on an ICCSDS-IDC approach that uses a bit plane extractor to parse the differences in the original image and its wavelet transformed coefficient. The output of bit plane extractor will be encoded by a first order entropy coder. Low-density parity-check-based Slepian-Wolf （SW） coder is adopted to implement the DSC strategy. Experimental results on space multispectral TDICCD images show that the proposed scheme significantly outperforms the CCSDS-IDC-based coder in each band.展开更多
文摘如何构建空间攻防网络是空间作战的一项关键技术。深入分析研究了CCSDS分包遥测、分包遥控、AOS建议及主网模型,提出了基于IP over CCSDS的空间攻防网络设计概念,分析和选择了相关的数据交换协议,构建了空间网络与地面网络端到端通信网络协议栈模型,并对CCS-DS技术在我国航天测控通信网中的应用提出了改造建议和应用思路。
文摘CCSDS为空间数据在地面的传输提出了标准的传输协议——空间链路扩展(Space Link Extension)协议。目前,国际上已有多个航天组织利用此协议搭建SLE传输系统开展合作,但当前的传输系统在一些情况下并不是十分可靠,出现了诸如测站系统复杂度过高,多测站同时执行任务时数据冗余量大,系统传输过程中发生故障难以及时恢复以及高速数据传输过程中遇到资源瓶颈等问题。阐述构建可靠SLE系统的意义,通过对在SLE传输任务中遇到的问题的分析,从系统配置策略、传输任务中物理和逻辑主备策略及高速数据拆分策略三个方面提出高可靠CCSDS SLE系统的设计方案。
文摘Deep space communication is quite different from conventional ground communication due to its time-varying,complexity and large signal delay,which consequently affects communication quality and system efficiency.Adjusting the transmission parameters when the channel environment changes during the communication can guarantee the performance index of the system,and therefore improve communication efficiency. An adaptive transmission scheme of transceiver based on Consultative Committee for Space Data Systems(CCSDS)protocols is proposed in this paper. According to the variation of the deep space channel,the symbol rate of transmission data is adjusted dynamically by estimating the signal-to-noise ratio(SNR) of the receiver in real time and adjusting the channel environment. This scheme can improve the channel utilization and system throughput under the premise of limiting the system bit error rate. Furthermore,this scheme is successfully implemented in Xilinx Virtex-5 FPGA board.
基金supported by the National High Technology Research and Development Program of China (Grant No. 863-2-5-1-13B)
文摘Multispectral time delay and integration charge coupled device （TDICCD） image compression requires a low- complexity encoder because it is usually completed on board where the energy and memory are limited. The Consultative Committee for Space Data Systems （CCSDS） has proposed an image data compression （CCSDS-IDC） algorithm which is so far most widely implemented in hardware. However, it cannot reduce spectral redundancy in mukispectral images. In this paper, we propose a low-complexity improved CCSDS-IDC （ICCSDS-IDC）-based distributed source coding （DSC） scheme for multispectral TDICCD image consisting of a few bands. Our scheme is based on an ICCSDS-IDC approach that uses a bit plane extractor to parse the differences in the original image and its wavelet transformed coefficient. The output of bit plane extractor will be encoded by a first order entropy coder. Low-density parity-check-based Slepian-Wolf （SW） coder is adopted to implement the DSC strategy. Experimental results on space multispectral TDICCD images show that the proposed scheme significantly outperforms the CCSDS-IDC-based coder in each band.
