【摘要】 提出了一种卫星通信多波束平面阵天线发射系统通道幅相误差星地环路校正方案。该方法在数字波束形成器之后,同时注入经过空域离散傅里叶变换的多路正交码信号作为校正测试信号,通过在地面关口站接收发射的信号,在基带校正算法单元利用并行信号处理技术同时得到多路射频通道的校正因子,并对得到的校正因子进行归一化处理,消除了对通道中非线性器件的影响。分别采用经过空域离散傅里叶变换的Walsh码和m/WH复合码作为校正测试信号验证了所提校正方案。仿真结果表明,当不存在同步误差时,2种方法都可以快速地校正通道的幅相误差;当存在同步误差时,采用m/WH复合码的校正方案具有更好的鲁棒性。更多还原

【Abstract】 A new satellite-ground calibration theme is proposed,which is used for the multi-beam planar array antenna transmitting system onboard satellite.Space discrete Fourier transform(DFT) of the orthogonal codes as the calibration test signals are injected into radio frequency(RF) channels after the digital beam-former.By utilizing the receive signals including the calibration test signals transmitted from the active phased array onboard satellite,the calibration factors for all the RF transmitting channels can be simultaneously obtained by parallel signal processing technology at a ground gateway station.The calibration factors are normalized to avoid the effects on the nonlinearity components.The proposed method is validated by using the space DFT of the Walsh codes and m/WH composite codes as the calibration test signals,respectively.The simulation results show that the two methods can calibrate amplitude and phase errors among RF channels without the synchronization error,but for synchronization error,the calibration theme using the composite m/WH codes is more robust.更多还原