均匀圆阵的测向模糊研究

在高分辨阵列测向系统中,均匀圆阵(UCA)是一种广泛使用的阵列结构。利用均匀圆阵的阵列流形的微分几何作为分析工具,对实际中常用的几种均匀圆阵的测向模糊进行了大量的计算机仿真试验,定量地给出了这些阵列的测向模糊方向和相应的秩,揭示了均匀圆阵的测向模糊性能与其阵元数和孔径之间的关系,得出了一些有实际意义的结论。这对工程应用时均匀圆阵的选择和构造具有很强的参考价值和指导意义,可以避免系统设计的盲目性和随意性。

Study on the Direction Finding Ambiguities Performance of Planar Antenna Array Based on Differential Geometry

In an array-based high resolution direction finding(DF) system,the Uniform Circular Array(UCA) is a widely-used geometric configuration of sensor array.By using differential geometry of array manifold of UCA,simulations are made for DF ambiguities of several common UCAs in practical use.Ambiguous directions and their associated rank of ambiguity in these UCAs are quantitily given.Relationship between DF ambiguity performance and the number of sensor,aperture of UCA is revealed.The meaningful conclusions are drawn,which offers a guide and reference to choose and construct UCAs in project application to avoid the blindness and willingness of the system design.