可变编码调制在遥感卫星中的应用效能研究

随着遥感卫星观测数据量的日益增加，卫星数据传输能力已成为制约遥感卫星使用效能的瓶颈因素。为充分利用近地遥感卫星数据传输的链路资源，采用可变编码调制（VCM）技术，通过对星地数传信道条件的动态评估，在保证链路传输误码率和链路余量的前提下，自适应地进行当前信道条件下的最优编码调制方式切换，充分利用系统链路余量，提高卫星星地数据传输效能。利用该方法，对VCM数传链路效能进行仿真分析，与相同符号速率的固定编码调制（CCM）体制相比，VCM传输效能平均提升42.1%，可为遥感卫星的数传通道设计提供借鉴。

Research on the application efficiency of variable coding modulation in remote sensing satellite

With the increasing amount of LEO remote sensing satellite observation data，the ability of data transmission has become a factor to restrict the efficiency of satellite. Variable coding modulation (VCM) can be used to make full use of the system link margin, based on the dynamic evaluation of the satellite-ground data transmission channel conditions. And on the premise of ensuring the bit error rate and link margin, the optimal coding and modulation mode switching under the current channel conditions are carried out adaptively, so as to improve the satellite data transmission efficiency. Using this method, the efficiency of log link was simulated and analyzed. Compared with the constant coding modulation (CCM) with the same symbol rate, the transmission efficiency was increased by 42.1% on average, which can provide a reference for the design of data transmission channel of remote sending satellite.