奇偶阵元数均匀圆阵测向性能研究

A Study on the Direction-finding Performance of Uniform Circular Array with Odd and Even Numbered Sensors

均匀圆阵比起其他形状的阵列,更符合电子侦察测向接收机的应用需求。文中采用将均匀圆阵投影为随入射角变化的非均匀线阵的方式,分析了奇偶阵元数均匀圆阵中的波程差特点,给出了对应的半径选取公式,并提出采用信号矢量相关系数表示测向误差变化趋势的方法。分析了两种不同阵列中各向等效性、测向精度、相位模糊与对阵元位置误差敏感度等特点,通过仿真验证了推论与公式的有效性。在工程应用方面,文中结论对均匀圆阵布阵具有较高的参考价值。

Compared with the other shapes of antenna array, uniform circular array is more suitable for the appl ication requirements of direction-finding receiver used for electronic reconnaissance. In this paper, uniform circular array is projected into non-uniform linear array which changes with the incident angle. The characteristics of wave path difference in uniform circular array with odd and even numbered sensors are analyzed, the corresponding radius selection formulas are given, and a method for representing the error trends of direction-finding with the coefficient of correlation is proposed. Equivalences in all directions, accuracy of direction-finding, characteristics of phase ambiguity and sensitivity of array element location are simulated in two different cases. Validity of the inferences and the formulas is verified through simulation. The conclusion of this paper has high referential value for shaping a uniform circular array in engineering applications.