论文部分内容阅读
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。
Directional accuracy and multi-target resolution are important technical indicators of passive sonar systems. This paper proves theoretically that both of these two indices are intrinsically related to the mainlobe characteristics of the directivity function of the sonar system. The optimal orientation accuracy is related to the Cramer-Rao lower bound of the delay estimation error. Under a certain signal-to-noise ratio, the orientation accuracy is inversely proportional to the beam width. Multi-target resolution is approximately equal to 1.3 times the width of the main lobe. In this paper, mathematical expressions of directional accuracy and multi-target resolution are given by taking the linear array and the circular array as an example, and the actual calculation results are compared with the theoretical ones.