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为进一步提高遥感卫星数据传输效率,在现有单用户变速率传输方法的基础上,提出变速率与空间复用相结合的遥感数传技术,通过“最佳终端组”的选择和自适应调制编码方式的设定,实现遥感卫星同时对多个地面终端的并发数据传输,从而提升遥感卫星过境窗口内的数据传输容量;分析与仿真结果显示:结合空间复用技术后,在卫星中心角7.5~5.5度区间内,多用户变速率传输方式的容量较现有单用户变速率方式提高了约60%。
In order to further improve the data transmission efficiency of remote sensing satellites, based on the existing single user variable rate transmission method, a remote sensing data transmission technology combining variable transmission rate and spatial multiplexing is proposed. Through the selection of “best terminal group” and " Adapt to the setting of modulation and coding scheme and realize the simultaneous data transmission of remote sensing satellites to multiple terrestrial terminals at the same time so as to enhance the data transmission capacity in the transit window of remote sensing satellites. Analysis and simulation results show that after combining spatial multiplexing technology, In the range of 7.5 to 5.5 degrees, the capacity of multi-user variable rate transmission mode is increased by 60% compared with the existing single-user variable rate mode.