阵列天线因随机振动引起的测向误差分析及校准

Analysis and Calibration of Direction Finding Error of Array Antenna Caused by Random Vibration

针对阵列天线受舰船甲板低频机械随机振动引发振子位移变化导致的测向误差问题,建立了天线振子随机振动误差模型,仿真分析了天线阵列3个轴向随机振动模式对测角接收信号的影响,提出了一种基于多个接收机在不同位置同时测量的测角误差校正方法。该方法采用最小二乘法得到多个误差校准矢量,通过调用天线波束指向扇区内校准矢量的方法进行误差补偿,解决了低频随机振动模式下阵列天线测角误差的校准问题。该方法已应用到舰载微波着舰引导系统数据解算中。

To solve the direction finding error of array antenna due to vibrator displacement caused by low frequency random mechanical vibration of ship deck, a model of antenna vibrator’ s random vibration error is established. The effect of random vibration modes of the antenna array on angular receiving signals in three axial directions is simulated and analyzed, and a calibration method is presented for angle-measuring error is presented based on simultaneous measurement by several receivers on several different positions. Several er-ror calibration vectors are obtained with this method by using the least square method. By compensating the error using the calibration vector of the antenna beam pointing into the sector, it has solved the calibration problem for angle-measuring error of array antenna under the mode of low frequency random vibration. This method has been applied in data resolution of ship-borne microwave landing guidance system.