摘要
CMACast是中国气象局基于DVB-S2标准的新一代卫星数据广播系统,使用亚洲卫星4号星一个完整的C波段转发器对中国及亚太地区进行气象资料、卫星遥感资料及流媒体视频的广播。该文详细介绍了CMACast的系统结构、主要功能和关键技术,并与中国气象局现有的3个广播系统PCVSAT,DVB-S和FENGYUNCast以及EUMETCast,GEONETCast Americas进行了比较。比较结果表明:CMACast覆盖面广,技术领先,功能强大,是目前世界领先的卫星数字广播系统。预计2012年初CMACast全面建成并投入使用,CMACast系统建成后,将全面整合PCVSAT,DVB-S和FENGYUNCast 3个系统的业务和用户,成为中国气象局唯一的广播系统,并作为GEONETCast的亚洲区域中心,向亚太地区进行GEOSS数据的广播。
Due to broad coverage,low-cost user equipment and easy installation,data broadcast system based on commercial communication satellite has been considered to be the most effective way for data dissemination worldwide.CMA has implemented three satellite broadcast systems,PCVSAT,DVB-S and FENGYUNCast since 1998.PCVSAT and DVB-S,which are Ku band systems covering China and surrounding area, are primarily used to distribute land and air based observation data and products.FENGYUNCast,which is a C-band system covering Asia and part of the south-western Pacific area,is primarily used to distribute space-based observation data and derived products from Fengyun series satellites of China.FENGYUNCast becomes part of GEONETCast Centre of GENONETCast Network in Asia-Pacific region in 2008. Currently PCVSAT,DVB-S and FENGYUNCast have 2400,700 and 200 users respectively. The coexistence of three broadcast system causes inefficiency and inconvenience to both CMA and users. In 2008,CMA started to build a new system,CMACast,to consolidate the services and users of the three systems together.CMACast is a multimedia dissemination system based on the second-generation Digital Video Broadcast（DVB-S2） technology with both file and multimedia transmission capability,employing a whole 36 MHz C-band transponder of AsiaSat-4 and the transmission capacity can reach up to 70 Mbps. Besides high data rate,CMACast is expected to enhance user management and data exchange cooperation with other regional GEONETCast Network Centres（GNC）,including EUMETCast and GEONETCast Americas. CMACast is not only the main component of CMA national and international communication system,but also the main component of WMO IGDDS and GEONETCast.The inf rastructural,main function and key technology of CMACast and its comparison between PCVSAT,DVB-S,FENGYUNCast,EUMETCast and GEONETCast Americas are introduced.Infrastructural introduction includes system architecture,coverage and capacity.Main function includes file broadcast,multimedia broadcast,data exchang
出处
《应用气象学报》
CSCD
北大核心
2012年第1期113-120,共8页
Journal of Applied Meteorological Science
基金
公益性行业(气象)科研专项"气象灾害预警信息发布关键技术研究"(GYHY200806013)
