单元波束夹角对和差单脉冲测角性能的影响研究

Study on Influence of Inter-component-beam Angle on ∑-△ Monopulse System

和差比幅单脉冲测角技术一直以其高精度著称,但测角范围的狭窄限制了其应用。数字波束形成技术的日趋成熟使得在中频或基带利用软件实现单脉冲测角成为可能。只要处理能力足够,软件单脉冲系统中的单元波束指向是可以单独控制的。通过讨论使和差单脉冲比有意义的条件,我们发现在一定范围内改变单元波束的夹角,可以改变单脉冲系统的测角范围和精度。本文通过对一个单元间距为二分之一波长的均匀线阵的仿真,分析了单元波束夹角的变化对测角范围和精度的影响,以及在被测目标位于不同角度时这种影响的大小程度,给出的结论能够帮助提高单脉冲系统的测角性能。

∑-△ amplitude-comparison monopulse technology is widely used in precise angle tracking. However, the application range has been limited by its narrow measurable angle range. With the advance of Digital Beam Forming technology, it is now possible to achieve monopulse angle measurement and tracking in the digital field by software. In order to find ways to improve performances of software monopulse angle measurement and tracking, conditions that make the ∑-△ monopulse ratio useful are studied. The influence of inter-componentbeam angle on system measurable angle range as well as accuracy is discussed. How will target angle location in relation to the boresight affect the angle measurement is also discussed. Simulation results show that decreasing intercomponent-beam angle will expand the measurable angle range while reduce measurement accuracy at the same time, and increasing inter-component-beam angle will improve angle measurement accuracy while narrow the measurable angle range.