加脊喇叭构成的幅度复加权测向圆阵研究

Research on a Circular Array for a Direction Finder with Vector Amplitude Weighting of Ridged Horns

常规宽频带双通道干涉仪测向圆阵在高频时系统稳健性能较差 ,在此基础上本文提出了利用加脊喇叭天线构成的幅度复加权测向圆阵作为补偿手段。论文对幅度复加权测向原理进行了详细推导 ,并利用实际测试结果进行了研究。结果表明 :阵元在满足特定幅度方向图的情况下 ,幅度复加权测向阵列可以得到较高的测向精度。由于无须利用相位信息 ,不存在相位模糊问题、由于不受阵列口径限制 ,从而可以靠增加阵元数目来补偿阵元边缘电平。提高了系统灵敏度、增强了系统稳健性能。

The robustness of a circular array for interferometer direction finder is weak when the system operates on high frequency. A vector amplitude weighing method of direction finder composed of ridged horns is presented and analyzed using results of test. The results indicate that the system has a high resolutions for the special pattern of the ridged horn. Because the method doesn′t need the phase information, so the ambiguity disappears. And it is not limited by the diameter of the array so the gain can be increased by increasing the number of elements. Thus it improves the sensitivity and enhances the robustness of the system.