星群协同阵列传输容量

为进一步提升星群协同的系统容量,考虑在卫星星群上配置阵列天线的传输模式.分析了最大化容量时下行链路的信道条件,给出了系统容量最大化的实现方式,探索了系统参数对信道容量的影响,发现信道容量随地面天线间距成周期性变化,其周期与卫星数目成反比、与地面天线阵列相对于东西方向的夹角的余弦成反比、与相邻卫星之间的角间距成反比.在多卫星多天线环境下,发现信道容量曲线的包络同样随地面天线间距成周期性变化,提出并通过仿真验证了多卫星多天线环境下减小地面天线间距和降低测控精确度要求的地面天线排布方案.

Channel capacity of cooperative grouped satellites with array based transmission

In order to improve the system capacity of cooperative grouped satellites, we considered the transmission mode of equipping the satellites with antenna arrays. Channel condition of downlink with maximum channel capacity was analyzed. Implementation approaches to the maximum channel capacity were put forward. Influences of system parameters to the channel capacity were researched. The results show that the channel capacity changes with the ground antenna distance periodically. The changing cycle of the channel capacity curve is in inverse proportion to the number of satellites (sat-number), to the cosine value of the angle between the ground array and an east-west line and to the angular distance between satellites (sat-angular-distance). The envelope of the channel capacity curve changes with the ground antenna distance periodically as well in a multi-satellites multi-antennas environment. An arrangement strategy of ground antennas in a multi-satellites multi-antennas environment was proposed to decrease the ground antenna distance and to lower the requirement of the ground array measurement accuracy as well, which was verified by the simulation results.