DBF系统的通道校正技术

CALIBRATION TECHNIQUES FOR CHANNEL MISMATCHING IN DBF SYSTEMS

描述了影响DBF系统特性的主要因素,研究了阵元间互耦对自适应方向图旁瓣和零深的影响及校正方法,讨论了在DBF阵中校正接收通道幅、相误差和I/Q支路正交误差的技术途径。计算机模拟和测试证明,按照所述方法进行校正可以得到满意的结果。另外,为了减小I/Q支路产生正交误差,建议采用中频直接采样和数字化的接收机方案。

The main factors affecting the performance of digital beam forming (DBF) systems are described. The effects of mutual coupling between elements on sidelobes and null depth of beam patterns in adaptive arrays, are studied, and the methods of mutual coupling compemation are proposed. The techniques to correct the errors in the amplitude and phase existing in each receiver channel and the bias errors of in-phase (I) and quadrature (Q) channels are discussed. The computer simulation and the measured results show that the above methods and techniques are efficient. In addition, in order to reduce the errors of I and Q channels, it is suggested that the scheme of intermediatc frequency direct sample and digital receivers should be used in DBF systems.