近年来,北斗导航系统建设逐渐完善,北斗三号区域短报文通信(Reginal Short Message Communication, RSMC)服务已进入行业应用越来越广的关键时期。WiFi信号与北斗三号RSMC出站信号频率接近,在实际使用过程中,2个系统可能存在兼容性问题...近年来,北斗导航系统建设逐渐完善,北斗三号区域短报文通信(Reginal Short Message Communication, RSMC)服务已进入行业应用越来越广的关键时期。WiFi信号与北斗三号RSMC出站信号频率接近,在实际使用过程中,2个系统可能存在兼容性问题。针对WiFi信号干扰对北斗三号RSMC出站信号性能的影响问题,介绍了北斗三号RSMC出站信号的空口特性,分析了WiFi信号对北斗三号RSMC出站信号的带外干扰和带内干扰,基于等效载噪比的分析方法,从载噪比损失方面对干扰的强度做了仿真分析,并给出了改进方法。研究结果为WiFi和北斗区域短报文服务兼容并存提供技术基础。展开更多
The RSMC Tokyo-Typhoon Centre was designated by the WMO and established in 1989.The Centre provides tropical cyclone information via GTS,Typhoon Centre Website,and/or other means.The Centre also implements several reg...The RSMC Tokyo-Typhoon Centre was designated by the WMO and established in 1989.The Centre provides tropical cyclone information via GTS,Typhoon Centre Website,and/or other means.The Centre also implements several regional initiatives in the western North Pacific mostly as part of activities of the Typhoon Committee.This report summarizes tropical cyclone analysis and forecast products and recent activities at the RSMC Tokyo–Typhoon Centre.展开更多
The World Meteorological Organization(WMO) is planning to implement a Global Multi-hazard Alert System(GMAS) to aggregate official warning^1 information issued by authorities around the world and to serve as a one-sto...The World Meteorological Organization(WMO) is planning to implement a Global Multi-hazard Alert System(GMAS) to aggregate official warning^1 information issued by authorities around the world and to serve as a one-stop shop to support the humanitarian organizations of the United Nations(UN), National Meteorological and Hydrological Services(NMHSs) and other global users including the media. It aims to enhance the authority and visibility of NMHSs and other alerting authorities. To aid effective dissemination of warnings to GMAS, the Common Alerting Protocol(CAP) was considered as a standard and robust format to use. In respect of GMAS infrastructure, the World Weather Information(WWIS) and the Severe Weather Information Centre(SWIC) of WMO as well as the WMO Alert Hub now being implemented are identified as core components, among others. The SWIC is being upgraded with GIS capability for displaying authoritative warnings and tropical cyclone(TC) information, and for use as a display platform of GMAS. Apart from warnings from NMHSs, authoritative TC warnings and advisories issued by Regional Specialized Meteorological Centres(RSMCs) and Tropical Cyclone Warning Centres(TCWCs) are also indispensable information for GMAS. As the existing TC warnings and advisories, now more or less in free text format, are mainly targeted for human users and are not intended for automatic parsing by computer software, it is proposed to make available the TC advisories in a machine-readable format so that TC information can be effectively ingested into GMAS and made available to the UN humanitarian organizations, NMHSs and other global users. In this respect, some enhancement measures to TC advisories are proposed. This calls for active collaboration of Members of the Typhoon Committee in the GMAS project.展开更多
文摘近年来,北斗导航系统建设逐渐完善,北斗三号区域短报文通信(Reginal Short Message Communication, RSMC)服务已进入行业应用越来越广的关键时期。WiFi信号与北斗三号RSMC出站信号频率接近,在实际使用过程中,2个系统可能存在兼容性问题。针对WiFi信号干扰对北斗三号RSMC出站信号性能的影响问题,介绍了北斗三号RSMC出站信号的空口特性,分析了WiFi信号对北斗三号RSMC出站信号的带外干扰和带内干扰,基于等效载噪比的分析方法,从载噪比损失方面对干扰的强度做了仿真分析,并给出了改进方法。研究结果为WiFi和北斗区域短报文服务兼容并存提供技术基础。
文摘The RSMC Tokyo-Typhoon Centre was designated by the WMO and established in 1989.The Centre provides tropical cyclone information via GTS,Typhoon Centre Website,and/or other means.The Centre also implements several regional initiatives in the western North Pacific mostly as part of activities of the Typhoon Committee.This report summarizes tropical cyclone analysis and forecast products and recent activities at the RSMC Tokyo–Typhoon Centre.
文摘The World Meteorological Organization(WMO) is planning to implement a Global Multi-hazard Alert System(GMAS) to aggregate official warning^1 information issued by authorities around the world and to serve as a one-stop shop to support the humanitarian organizations of the United Nations(UN), National Meteorological and Hydrological Services(NMHSs) and other global users including the media. It aims to enhance the authority and visibility of NMHSs and other alerting authorities. To aid effective dissemination of warnings to GMAS, the Common Alerting Protocol(CAP) was considered as a standard and robust format to use. In respect of GMAS infrastructure, the World Weather Information(WWIS) and the Severe Weather Information Centre(SWIC) of WMO as well as the WMO Alert Hub now being implemented are identified as core components, among others. The SWIC is being upgraded with GIS capability for displaying authoritative warnings and tropical cyclone(TC) information, and for use as a display platform of GMAS. Apart from warnings from NMHSs, authoritative TC warnings and advisories issued by Regional Specialized Meteorological Centres(RSMCs) and Tropical Cyclone Warning Centres(TCWCs) are also indispensable information for GMAS. As the existing TC warnings and advisories, now more or less in free text format, are mainly targeted for human users and are not intended for automatic parsing by computer software, it is proposed to make available the TC advisories in a machine-readable format so that TC information can be effectively ingested into GMAS and made available to the UN humanitarian organizations, NMHSs and other global users. In this respect, some enhancement measures to TC advisories are proposed. This calls for active collaboration of Members of the Typhoon Committee in the GMAS project.
