基于方向图匹配的单天线波束扫描测角方法

Pattern-matched direction finding method based on single antenna beam scanning

针对传统单天线波束扫描测角问题,提出一种基于方向图匹配的波束扫描测角方法。首先分析了传统波束扫描方法存在的测角精度低、非理想主瓣侦收条件下难以适用的问题,提出利用全部观测数据与方向图抽样点进行匹配的方法,给出了基于互相关的角度估计方法。考虑到搜索角度初值对互相关法计算量的影响,给出了基于方向图包络特征的搜索范围确定方法;基于方向图的连续性表示和多级搜索方法,在降低计算量的同时,保证较高的估计精度。理论和仿真结果表明,该方法具有测向精度高、计算量低的优点,对侦收角度无要求,提高了波束搜索法的适应性。

For direction finding based on single antenna beam scanning,a new method based on pattern matching is proposed.Firstly,low precision and unsuitability in imperfect observing condition for the general method is analyzed.New method is proposed using cross-correlation technique by matching all the estimated amplitudes with corresponding sampling of pattern.Considering the impact of initial searching angle on computational complexity,searching range is determined utilizing features of pattern envelope;By multi-level searching with continuous representation of pattern,new algorithm can obtain high estimation precision with reduced calculation.Theoretical and simulation results verify that observing angles are not confined for this method which improves the adaptability of the beam scanning method.