收集2000—2023年Web of ScienceTM和CNKI数据库中关于声景与健康的相关文献,利用CiteSpace软件进行可视化文献计量分析,共筛选出544篇有效论文。研究发现:该领域论文数量呈现稳定增长趋势;研究机构整体分布较为分散,尽管单个机构内部...收集2000—2023年Web of ScienceTM和CNKI数据库中关于声景与健康的相关文献,利用CiteSpace软件进行可视化文献计量分析,共筛选出544篇有效论文。研究发现:该领域论文数量呈现稳定增长趋势;研究机构整体分布较为分散,尽管单个机构内部合作紧密,但跨机构合作尚显不足,互动交流有待加强;研究热点已从初期的环境噪声逐渐转向声景感知,探讨声景与生态效益的关联;声景与健康领域的热门话题表现为多学科多理论相互融合、研究载体日趋细化、研究方法多样化以及新兴技术不断引入。鉴于目前该领域存在的跨学科合作和数字化应用不足,未来研究应更加注重跨学科合作和人工智能等新技术应用,进一步提高对精准度与实践性的重视程度。研究结果揭示了国内外声景与健康研究的总体特点、热点问题及发展趋势。展开更多
Beam-hopping technology has become one of the major research hotspots for satellite communication in order to enhance their communication capacity and flexibility.However,beam hopping causes the traditional continuous...Beam-hopping technology has become one of the major research hotspots for satellite communication in order to enhance their communication capacity and flexibility.However,beam hopping causes the traditional continuous time-division multiplexing signal in the forward downlink to become a burst signal,satellite terminal receivers need to solve multiple key issues such as burst signal rapid synchronization and high-per-formance reception.Firstly,this paper analyzes the key issues of burst communication for traffic signals in beam hopping sys-tems,and then compares and studies typical carrier synchro-nization algorithms for burst signals.Secondly,combining the requirements of beam-hopping communication systems for effi-cient burst and low signal-to-noise ratio reception of downlink signals in forward links,a decoding assisted bidirectional vari-able parameter iterative carrier synchronization technique is pro-posed,which introduces the idea of iterative processing into car-rier synchronization.Aiming at the technical characteristics of communication signal carrier synchronization,a new technical approach of bidirectional variable parameter iteration is adopted,breaking through the traditional understanding that loop struc-tures cannot adapt to low signal-to-noise ratio burst demodula-tion.Finally,combining the DVB-S2X standard physical layer frame format used in high throughput satellite communication systems,the research and performance simulation are con-ducted.The results show that the new technology proposed in this paper can significantly shorten the carrier synchronization time of burst signals,achieve fast synchronization of low signal-to-noise ratio burst signals,and have the unique advantage of flexible and adjustable parameters.展开更多
文摘收集2000—2023年Web of ScienceTM和CNKI数据库中关于声景与健康的相关文献,利用CiteSpace软件进行可视化文献计量分析,共筛选出544篇有效论文。研究发现:该领域论文数量呈现稳定增长趋势;研究机构整体分布较为分散,尽管单个机构内部合作紧密,但跨机构合作尚显不足,互动交流有待加强;研究热点已从初期的环境噪声逐渐转向声景感知,探讨声景与生态效益的关联;声景与健康领域的热门话题表现为多学科多理论相互融合、研究载体日趋细化、研究方法多样化以及新兴技术不断引入。鉴于目前该领域存在的跨学科合作和数字化应用不足,未来研究应更加注重跨学科合作和人工智能等新技术应用,进一步提高对精准度与实践性的重视程度。研究结果揭示了国内外声景与健康研究的总体特点、热点问题及发展趋势。
基金This work was supported by the Key Research and Development Program of Shaanxi(2022ZDLGY05-08)the Application Innovation Program of CASC(China Aerospace Science and Technology Corporation)(6230107001)+2 种基金the Research Project on Civil Aerospace Technology(D040304)the Research Project of CAST(Y23-WYHXJS-07)the Research Foundation of the Key Laboratory of Spaceborne Information Intelligent Interpretation(2022-ZZKY-JJ-20-01).
文摘Beam-hopping technology has become one of the major research hotspots for satellite communication in order to enhance their communication capacity and flexibility.However,beam hopping causes the traditional continuous time-division multiplexing signal in the forward downlink to become a burst signal,satellite terminal receivers need to solve multiple key issues such as burst signal rapid synchronization and high-per-formance reception.Firstly,this paper analyzes the key issues of burst communication for traffic signals in beam hopping sys-tems,and then compares and studies typical carrier synchro-nization algorithms for burst signals.Secondly,combining the requirements of beam-hopping communication systems for effi-cient burst and low signal-to-noise ratio reception of downlink signals in forward links,a decoding assisted bidirectional vari-able parameter iterative carrier synchronization technique is pro-posed,which introduces the idea of iterative processing into car-rier synchronization.Aiming at the technical characteristics of communication signal carrier synchronization,a new technical approach of bidirectional variable parameter iteration is adopted,breaking through the traditional understanding that loop struc-tures cannot adapt to low signal-to-noise ratio burst demodula-tion.Finally,combining the DVB-S2X standard physical layer frame format used in high throughput satellite communication systems,the research and performance simulation are con-ducted.The results show that the new technology proposed in this paper can significantly shorten the carrier synchronization time of burst signals,achieve fast synchronization of low signal-to-noise ratio burst signals,and have the unique advantage of flexible and adjustable parameters.
