| 1. | It is shown that the practical beam patterns are severely distorted due to these errors
研究表明，阵列模型失配会使实测波束图严重畸变。 |
| 2. | A modified approach for narrowband adaptive beam pattern optimisation is proposed by using a varying step size in the optimisation procedure
系统地研究了窄带声呐的波束形成问题，提出了自适应波束优化设计的改进方法。 |
| 3. | The ideal array would also be able to adjust the beam pattern so that it minimized interference from other users who were communicating on the same frequency channel
当其他用户利用相同的频道通话时，理想的阵列也必须能够调整波束的场形，才能把讯号的干扰降到最低。 |
| 4. | This paper has successfully adopted the above method to synthesize an equally - spaced linear array , and then has extended its application into the synthesis of shaped beam patterns from planar arrays
本文正是采用此方法首先得到了线阵综合的结果，并将它推广运用到面阵综合的情形。 |
| 5. | The method uses both linearly constraints and quadratic pattern constraints to control the beam pattern , which is used in arbitrary array synthesis . it is simple effective and feasible
此算法同时应用了线性约束和二次约束来控制波束特征,适用于任意阵列的综合,算法简单,计算效率高。 |
| 6. | In this paper , a synthesis method is studied to produce the shaped beam patterns . this method is based on the fact that synthesis of antenna patterns is equivalent to minimizing a certain function
本文重点研究了一种赋形波束功率方向图的综合算法，并以赋球波束为例分别讨论了等间距线阵和方阵的综合过程。 |
| 7. | It is one of advanced technologies used in modern radar that applying adaptive algorithms to radiation pattern of an adaptive array in order to control nulls of the beam pattern and to suppress interferential signals
在自适应天线阵的发射模式中应用自适应算法，控制发射波束的零点位置，以达到抑制干扰信号的目的，是现代雷达采用的先进技术之一。 |
| 8. | Portable multiple beam sonar system is mainly used to survey the underwater terrain of huge reservoir . firstly , the thesis introduces the index of performance . secondly , it explains the ranging principle of sonar system , and simulates the processing procedure on computer , gives the beam pattern
本文首先介绍了地形声呐的设计指标，然后叙述了多波束地形声呐的测距原理，并对具体的实现过程进行了计算机仿真，给出了定向波束图案。 |
| 9. | In the experiment , we use the he - ne laser and the semiconductor laser as the source , record the bessel beam patterns behind the axicon by using a digital camera and a microscope , measure the radius of the bessel beam central spot by film - scanning and measure the effect of both the radius of the aperture and the open angle of the axicon on the maximum non - diffraction distance . the experiments show that a specific propagating range has constant power and the beam has a bessel - like distribution in this range . the results agree with the beam corresponding to a diffraction free beam
同时我们还采用胶片扫描的方法测量了无衍射光束的中心光斑尺寸,测量了不同光阑孔径和不同棱角情况下的最大无衍射距离和传播轴附近横截面内微小光孔中的光强,实验结果显示当激光光束经过轴棱锥转换后有一段距离功率变化很小,且分布近似贝塞尔分布,符合无衍射光束的特性;经过聚焦后,呈现三维分布中空的光束bottlebeam ,实验结果与理论分析基本吻合。 |
| 10. | The behavior of capping beam that joints single rank of piles , which nowadays is widely applied to the construction in china , is complexly influenced by many factors . while conversed continuum beam pattern is primarily adopted in existent design methods to predigest computations , it still lacks of satisfaction as a result that it could n ' t reflect on the variance of piles and the infection of soil
条形桩基连续承台梁在我国现代建筑工程中应用极为广泛，其受力影响因素极为复杂，现行设计大多采用倒置的连续梁模式进行简化计算，其无法考虑基桩的差异性以及地基土体对承台梁的影响，计算结果难以令人满意。 |
