基于反相法的中场校准技术研究

Research on Middle Field Calibration Technology Based on Phase Inverted Method

中文关键词:  中场法  相控阵天线  反相法  芯片化  校准

英文关键词:method of middle-field  phased antenna  inverse phase  chipping  calibration

中文摘要:

      在相控阵天线研制中,阵面校准是非常重要的一环。对比各种校准方法,中场法使用设备少、测试效率高,因而获得了广泛的应用。 通常情况下,阵面中的 T/ R 组件内设计有三态开关(发射态、接收态、负载态),中场测试时,通过“逐路通”的方式(逐一选通 T/ R 组件的射频通道,非被测通道处于负载状态),得到所有通道的发射通道(或接收通道)的幅相数据。 但在“芯片化”T/ R 组件组成的阵面中,开关隔离度有限,泄露信号严重干扰被测信号,甚至无法进行正常的故障判断。本文讨论一种基于反相法的中场校准方法,分析了该方法的误差量级,最后通过远场波瓣测试验证了该方法的有效性。

英文摘要:

      Array calibration is a key step in research on phased array antenna. Compared with other calibration methods, middle-field calibration uses fewer devices and has higher test efficiency, so it has a wide range of application. Usually, three-state switches (transmission-state, receiving-state and load-state) are designed and used in T/ R modules. During middle-field test, da-ta of amplitudes and phases in all transmission channels (receiving channels) may be obtained by “one by one” method (switch on receive channels of T/ R modules one by one and the non-tested channels is in the load-state). However, isolation of switch is limited in the array composed of “chipping” T/ R modules. So signals to be tested will be interfered by leakage signals severely, and faults cannot even be identified normally. In this article, a middle-field calibration based on inverse phase method is proposed and its error magnitude is analyzed. Finally, this method is verified valid by patterns tested in far-field.