星载功率动态分配网络幅相误差校准方法

发布时间：2018-01-28 10:57

本文关键词： 卫星通信功率动态分配幅相误差校准 ZCZ序列　出处：《通信学报》2017年04期 　论文类型：期刊论文

【摘要】：针对移动通信卫星不同波束通信业务量分布不均衡导致下行波束的发射功率差异大问题,给出功率动态分配网络实现结构,该结构根据通信业务量需求自适应分配发射波束功率,同时保证功率放大器的工作点基本一致;针对功率动态分配网络在存在幅相误差时的输出信号互耦,从而导致波束性能急剧下降问题,提出一种功率动态分配网络幅相误差校准方法。该方法利用正交零相关(ZCZ,zero-correlation zone)序列在零相关区间内正交互相关特性实现校准信号间的解耦;零相关区间内具有优异的自相关特性,通过降低校准信号的发射功率,使校准的同时不影响正常通信性能。性能仿真和远场测试结果表明:在校准信号功率比通信信号功率低10 dB时,校准后的幅度误差小于0.1 dB,相位误差小于0.3°,实测波束主瓣内增益损失小于0.2 dB。
[Abstract]:In order to solve the problem that the uneven distribution of traffic in different beams of mobile communication satellite leads to great difference in the transmission power of downlink beam, the structure of dynamic power allocation network is presented. The structure adaptively allocates transmit beam power according to the requirement of communication traffic, and at the same time ensures that the working point of the power amplifier is basically the same. The output signals of power dynamic distribution networks are coupled with each other in the presence of amplitude-phase errors, which leads to a sharp deterioration of beam performance. A calibration method for amplitude and phase error of power dynamic distribution network is presented, in which the orthogonal zero correlation ZCZ is used to calibrate the amplitude and phase error. The zero-correlation sequence decouples the calibration signals by the positive correlation in the zero correlation range. The zero correlation region has excellent autocorrelation characteristics by reducing the transmission power of the calibration signal. The results of performance simulation and far-field test show that the amplitude error after calibration is less than 0.1 dB when the power of calibration signal is 10 dB lower than that of communication signal. The phase error is less than 0.3 掳, and the gain loss in the main lobe is less than 0.2 dB.
【作者单位】：西安邮电大学电子工程学院;西安科技大学通信与信息工程学院;
【基金】：国家自然科学基金资助项目(No.61302133) 陕西省教育厅科研计划基金资助项目(No.14JK1678)~~
【分类号】：TN927.23
【正文快照】： 移动通信卫星系统一般采用多个点波束实现广域覆盖,达到增强辐射增益、支持小终端移动通信业务的目的,如Thuraya星形成245个点波束,Imarsat4卫星形成228个点波束[1,2]。在不同波束覆盖区内人口分布、经济发展不均衡,导致不同波束通信业务量分布也不均衡,即每个下行波束的发射

【参考文献】