星载DBF Tx射频通道幅相误差校正
doi: 10.3724/SP.J.1146.2007.00895
Amplitude and Phase Errors Calibration of the Satellite-Borne DBF Transmitting RF Channel
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摘要: 为了实现精确的多波束形成，该文提出了一种补偿卫星通信多波束系统发射通道幅相误差的校正方法, 该方法在发射通道中同时注入多路正交码变换的校正测试信号，通过接收多路发射机的输出信号和，在基带校正算法单元利用正交码的时间相关性和IDFT并行处理的方法，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了归一化处理，消除了对通道中非线性器件的影响。仿真结果表明，该方法可以有效地补偿射频通道间的幅相不一致性，校正后的波束方向图接近理想的波束方向图。Abstract: In order to realize the precise multi-beam forming, a calibration method of the amplitude and phase error among RF channels for the transmitting multi-beam array antenna system onboard satellite is proposed. This method is conducted by receiving the sum of the output signal of all RF transmitting channels, including the temporally multiplexed orthogonal codes injected from the base-band, the calibration factors for all the RF transmitting channels can be simultaneously obtained by temporal correlation of the orthogonal codes and the IDFT parallel processing technology. The calibration factors are normalized for avoiding the effects on the nonlinearity components. Computer simulation shows that the beam pattern after calibration is very close to the ideal beam pattern.
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