摘要
在遥感卫星的数传系统中,采用虚拟信道方式对多路遥感数据进行数传合路,形成标准帧格式信息流以适合空间物理信道传输。针对缓存容量受限的条件,提出了两种数传合路方案:第一种方案是将全部虚拟信道同时数传合路到I帧和Q帧;第二种方案是将其中一半虚拟信道数传合路到I帧,将另外一半虚拟信道数传合路到Q帧。采用仿真技术对两种数传合路方案的缓存容量需求进行了动态分析,结果表明:采用第二种方案时缓存容量需求更低,只须采用地址空间深度为8K的缓存器即可满足数传合路处理需求。第二种数传合路方案已应用到某卫星工程项目的数传系统产品中,通过了地面测试、试验以及在轨飞行验证。文章提出的技术途径可为后续航天器更多种类遥感数据的数传合路设计提供参考。
In the remote sensing satellite data transmission system, multi remote sensing datum are multiplexed using virtual channels to form a standard frame-structured stream suitable for physical channel of space communication. Two multiplexing schemes are put forward in the restricted buffer capacity condition. In the first one, all virtual channels are multiplexed to form both I and Q frames. And in the second, one half of virtual channels are multiplexed to form I frames while the other half of virtual channels are multiplexed to form Q frames. The buffer capacity demands of both multiplexing schemes are analyzed dynamically using simulation techniques. The results show that the second scheme requires less buffer capacity, making it feasible that only 8K address depth buffers can meet the need of the multiplexing procedure. The second scheme has been applied to the data transmission system products of certain satellite pro- ject and has passed all ground tests, experiments and flight verifications. The approach proposed in this paper has a reference value for multiplexing of other remote sensing datum in follow-up spacecraft.
出处
《航天器工程》
2013年第1期65-71,共7页
Spacecraft Engineering
关键词
遥感卫星
数据传输
合路处理
动态分析
remote sensing satellite； data transmission； multiplexing； dynamical analysis
