声呐系统的最佳定向精度和最优多目标分辨力研究
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摘要: 定向精度和多目标分辨力是被动声呐系统的重要技术指标.本文从理论上证明,这两个指标都与声呐系统的指向性函数的主瓣特性有内在联系.定向精度的最佳值与时延估计误差的克拉美─罗(Cramer-Rao)下界有关,在一定的信噪比条件下,定向精度与波束主瓣宽度成反比.多目标的分辨力约等于1.3倍主瓣的宽度.文中以线阵与圆阵为例给出定向精度和多目标分辨力的数学表达式,并以实际计算结果与理论作比较.
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