基于近场测量的数字相控阵校准系统

A digital phased array calibration system based on near-field measurement

摘要:

为解决数字相控阵不能利用传统的矢量网络分析仪进行校准的难题，提出一种基于近场测量的数字相控阵校准系统。通过矢量网络分析仪外加混频器和信号源提供变本振的方法，设计了发射态和接收态下的数字相控阵天线校准系统架构，实现了数字相控阵采用矢量网络分析仪的同频率网络参数测量；通过设计时序分配单元，实现了多频点数字相控阵的自动化测试，大大缩短了测量时间。经过实际测量，顺利完成了20个天线单元的接收与发射幅相校准工作，校准后的相位一致性能够稳定保持在±7°范围内。

Abstract:

To address the challenge that digital phased arrays cannot be calibrated using traditional vector network analyzers, a near-field measurement-based digital phased array calibration system is proposed. By employing a method of providing a local oscillator through a mixer and signal source in addition to the vector network analyzer, the architecture of the digital phased array antenna calibration system for both transmission and reception states has been designed, achieving the same frequency network parameter measurement of the digital phased array using the vector network analyzer. By designing a timing distribution unit, the automated testing of multi-frequency digital phased arrays has been realized, significantly reducing the measurement time. After actual measurement, the reception and transmission amplitude and phase calibration of 20 antenna units are successfully completed, and the phase consistency after calibration can be stably maintained within a range of ±7°.