弹载相控阵雷达单阵元高精度去耦方法

针对目前工程实践中弹载相控阵雷达近场测试中无法有效补偿阵元间互耦的问题,对某型号弹载相控阵雷达的矩形贴片天线,建立单阵元辐射模型,结合信号子空间基本原理,提出一种基于信号波达方向估计值计算单阵元互耦总影响系数的方法。该方法通过均匀矩形阵列信号波达方向估计值计算一个阵元与其周围八个阵元的互耦系数,将互耦系数累加后的结果作为对单阵元的互耦总影响系数,将近场测试值除以互耦总影响系数可得互耦校准后的阵元参数。微波暗室实验结果表明:该方法得到的阵元幅值和相位与理论计算值相近,说明方法是有效的。该方法可以应用到某型弹载相控阵雷达天线校准中,能有效补偿阵元间互耦。

Accurate Calculation of Antenna Radiation of Elastic-borne Phased Array Radar Based on Mutual Coupling

In order to solve the current problem that mutual coupling can not be compensated in the current engineering practice,we established a single-element radiation model of a type of missile-loaded phased array radar.Combining the basic principle of signal subspace, we proposed a method for calculating the total influence coefficient of single-element mutual coupling based on the DOA. Firstly, the mutual coupling coefficient between one array element and the surrounding eight array elements was calculated by the DOA estimation value of the uniform rectangular array signal.Then the result of the mutual coupling coefficient was added as the total influence coefficient of the mutual coupling of the single element. Finally, the near-field test value was divided by the total mutual influence coefficient to obtain the array element parameters after mutual coupling calibration. The result of microwave darkroom experiment shows that the amplitude and phase of the array obtained by this method are similar to the theoretical calculations, so the method is effective.The method also can be applied to the calibration of a type of missile-borne phased array radar antenna, which can effectively compensate the mutual coupling between array elements.