... narrow beam echo sounder 窄束回声测深仪 narrow beam 窄波束 narrow channel 狭水道 ...
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Under the mid-latitude mid-range communication,the calculations of channel parameters are taken for different number of transmit antennas at different time and the serving region size is calculated for certain narrow beam.
以中纬度地区的中距离通信为例,计算了不同时刻使用不同发射天线数时的信道参数,并计算了特定窄波束的服务区间范围。
参考来源 - 采用发射窄波束的短波通信信道特性研究Both the theoretical study and the calculation results show that the gain of the power ratio of dominant path to the others and the coherence bandwidth can be dramatically increased in the shortwave communication with narrow-beam.
理论分析和计算结果均表明:在短波通信中使用发射窄波束,主路径相对其他路径的功率比值增益以及信道相干带宽都会显著提高。
参考来源 - 采用发射窄波束的短波通信信道特性研究·2,447,543篇论文数据，部分数据来源于NoteExpress
在天线波束赋形部分，介绍了窄波束零陷和宽波束零陷。
In the antenna shaped-beam section, introduced narrow beam nulling and wide beam nulling.
所设计的一维扫描相控阵天线在方位面具有窄波束、低副瓣特性，在俯仰面实现和差波束。
The one-dimensional phased array antenna discussed in this paper needs to radiate a narrow beamwidth and low sidelobe pattern on the horizontal, a sum and difference beam on the vertical.
为了实现对短波频段全空域低信噪比信号的良好接收，本文提出了一种窄波束全向接收的自适应天线阵。
In order to receive omnidirectional low-SNR signal of whole HF band, we present an adaptive omni-direction & narrow-beam receiving antenna array.
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