甚高频阵列波束构造与容量优化

VHF Array Beamforming and Capacity Optimization

甚高频(VHF)卫星通信是保障海上安全及遇险处理的重要手段。线性正交基波束是VHF卫星系统在有限带宽有限阵列规模下提升通信容量的一种有效途径。然而,线性正交基波束的非一致中空发散特性会导致多正交模难以公平利用且远距离通信受限。针对VHF卫星通信有限带宽有限阵列规模下的公平性远距离传输瓶颈问题,需研究新型非线性正交基波束的数学机理及构造方法;设计线性正交基与非线性正交基协同的波束宽角域覆盖方法,实现目标区域最佳能量覆盖;提出面向业务需求的星船协同通信容量优化方法,高效保障海事通信的有效容量需求。

Very high frequency(VHF)satellite communication is an important means for ensuring maritime safety and distress handling.Linear orthogonal basis beams are an effective way to enhance communication capacity in VHF satellite systems under limited bandwidth and array size.However,the non-uniform hollow divergence characteristic of linear orthogonal basis beams leads to difficulties in fair utilization of multiple orthogonal modes and limits long-distance communication.To address the bottleneck of fairness and long-distance transmission in VHF satellite communication with limited bandwidth and array size,this study investigates the mathematical mechanism and construction methods of novel nonlinear orthogonal basis beams.A beam wide-angle domain coverage method that combines linear and nonlinear orthogonal bases is designed to achieve optimal energy coverage in target areas.Furthermore,a satellite-ship collaborative communication capacity optimization method,oriented towards service requirements,is proposed to efficiently ensure effective capacity for maritime communication.