干涉仪测向基线组合方式选取依据初探

针对相关干涉仪测向查表算法,以均匀5圆阵为例提出了3种基线组合方式:固定基准法、最长基线法和最短基线法。建立相关干涉仪测向仿真模型,通过仿真分析了3种基线组合方式对测向精度的影响,包括测向精度随频率的变化、测向精度随方位角的变化和测向模糊3个方面。得出最长基线法具有最高测向精度以及最小相位容差,最短基线法具有最低的测向精度和最大的相位容差,固定基准法性能居中且测向误差对方位角更加敏感的结论。从而对基线组合方式的选取提供理论依据。

Research on Choice of Baseline Combination in Correlative Interferometer

According to table searching algorithm of correlative interferometer,three baseline combination modes were given,in cluding fixing basic antenna,longest baseline and shortest baseline. A simulation model of correlative interferometer was constructed with uniform circular array of five antennas. It analyzed the effect of 3 baseline combinations on direction finding,including azimuth error var ying with frequency and azimuth and direction finding ambiguity. The paper concluded that the longest baseline mode has highest azi muth precision and smallest phase error allowance and the shortest baseline has largest phase allowance error, and fixing basic antenna provides a moderate performance and its direction finding error was most sensitive with azimuth.