宽带稀疏线阵内外场联合通道校正技术研究

Research on Joint Inside and Outside the Field Channel Calibration Technology for Wideband Linear Thinned Arrays

实际工程应用中数字波束形成的关键技术之一是接收通道校正,校正的精度将直接影响形成波束的主瓣宽度和副瓣电平。结合某工程实例讨论了一种在工程实现中的接收通道校正方法,通过频域均衡滤波器法和内外场联合利用已知信号源的天线校正方法,实现了通道幅相不一致性的校正,并提出了提高波束精度的天线方向校正方法。最后,根据实验数据计算相关的校正系数,并对测试信号进行校正,校正结果验证了该方法的有效性。

In practical engineering applications,receiving channel calibration is one of the key technologies for receiving DBF (digital beam forming)and the accuracy of calibration directly affects forming beams’width of main lobe and level of side lobe. In this paper,a receiving channel calibration method is discussed combining with a practical engineering project,according to frequency domain equalization filter method and antenna calibration method via a known signal source used inside and outside the filed. In addition,an antenna orientation calibration scheme is provided to improve the accuracy of the beam. In the end,associated calibration coefficients are calculated according to the experimental data,which is used for calibrating test signal. Calibration results demonstrate the effectiveness of the method.