三通道干涉仪雷达测角方法

针对米波雷达天线同有尺寸较大的问题,研究用3根接收天线实现全空域探测的雷达测向算法.根据天线放置的等边三角形几何关系,通过天线阵子间的相位差就可计算目标的方位和俯仰信息,天线阵子问的相位差通过快速傅里叶变换(FFT)数字比相法获得.对于动目标检测(MTD)雷达,根据三通道的动目标检测结果即可求得目标的相位差并进行干涉仪测向,给出了基于此方法的一种典型的雷达测向系统结构及其实现步骤.分析了三通道干涉仪测角误差的影响因素,给出了不同信噪比下测角误差的仿真结果.仿真结果证明了该方法的有效性和实用性.

Three-Channel Interferometer Radar Angle Estimation Method

To implement a portable meter wave radar,a three-channel interferometer AOA(angle of arrival) estimation method is proposed.The method implements the targets location in the whole space with only three receiving elements.Because the three receiving elements are placed on the vertexes of an equilateral triangle,the azimuth and elevation angles can be calculated through the phase differences between different elements.The phase differences are obtained by the method of FFT.For a moving target detection radar,the phase differences of the three elements can be calculated from the three channels' moving target detection(MTD) results.Then the angle of arrival(AOA) estimation based on three-channel interferometer can be achieved.It gaves the structure and implementation process of a typical radar location system based on the method.The reasons affecting the performance of the AOA estimation method are analyzed.Results of Monte-Carlo signal simulations with inputs in different SNRs are presented to demonstrate the angle accuracy performance,showing that the AOA estimation method is effective and practical.