摘要
空间分辨率的大幅提高导致了低轨遥感卫星产生海量遥感数据,致使现有X频段星地数传通道压力急剧增加。针对此问题,文章分析了采用Ka频段进行星地海量数据传输的必要性。为了综合衡量数据传输性能,合理利用地面站资源,提出遥感卫星传输效能因子指标,依据此指标,对地面站的利用方案进行了优化设计。理论分析与仿真试验结果表明:采用Ka频段传输,在传输速率达到目前X频段最高速率3倍时,典型地面站的链路可用率达到95%以上,显著提高了数传系统的综合传输效能。
Rapidly increasing spatial resolution of LEO remote sensing satellite leads to mass remote sensing data, which results in much pressure on satellite-to-earth data transmission at X-band. To solve the problem, the necessity of transmission at Ka-band is analyzed in this paper. On this basis, to evaluate the data transmission performance synthetically and utilize ground station resource reasonably, a figure of transmission effectiveness factor is proposed, and an optimum design of data transmission scheme for ground station application is conducted. Results of theoretical analyses and simulation show that compared with the current maximum transmis- sion rate at X-band, the transmission rate at Ka-band is multiplied by 3, while link availability of typical ground station is over 95%, which improves the overall transmission effectiveness signifi- cantly.
出处
《航天器工程》
2013年第1期72-77,共6页
Spacecraft Engineering
关键词
低轨遥感卫星
KA频段
星地数据传输
效能
链路可用率
LEO remote sensing satellite； Ka-band
satellite-to-earth data transmission
effec-tiveness
link availability
