| 1. | In order to hold the performance of the antenna array of hf radar the length of antenna array is also very long
高频超视距雷达工作在短波波段,为了保持一定的天线阵性能,天线阵尺寸通常也较大。 |
| 2. | For ensure the reliability of hf radar in congested environment , the radar signal with discontinuous spectra has attracted increasing attentions
为保证高频雷达在恶劣环境下正常工作,非连续谱雷达信号日益受到重视和研究。 |
| 3. | This paper introduces several methods retrieving wind direction from hf radar echo doppler spectrum and analyses the feature of those methods
本论文介绍了现有的从高频雷达回波多普勒谱中提取风向的几种方法，分析了这几种方法的不足之处。 |
| 4. | It introduces the phase noise measurement method of hf radar ' s transmitting signal , especially the measurement method of low phase noise which is close - in to carrier frequency
指出了在高频雷达发射信号相位噪声的测量，特别是近载频低相位噪声的测量。 |
| 5. | The ionosphere contamination imposing on the high - frequency ( hf ) radar echoes has to be suppressed since it severely degrades the detection performance of hf radar
摘要高频雷达回波信号受到电离层污染从而影响了雷达的探测性能，因此需要进行去污染处理。 |
| 6. | In this paper , the mechanism of the ionosphere contamination from the ionosphere distortion is exposed for the first time by analyzing the process of hf radar signal processing
该文通过对高频雷达信号处理过程的分析，阐明了电离层扰动对回波信号污染的机理。 |
| 7. | In the highly crowded hf band , available continuous bandwidth is very narrow , this threaten the viability of hf radar based on the continuous spectra signal system seriously
在拥挤的高频频段,可用的连续带宽比较窄,基于连续谱信号体制的高频雷达的生存能力受到严重威胁。 |
| 8. | The 3d radar display system described in this paper is a part of the hf radar simulation platform , which provides the function of 3d display for the simulation platform
因此,开发高频雷达三维显示系统是十分必要的。本文所设计的三维显示系统可为现有的高频雷达系统仿真平台增添三维显示功能。 |
| 9. | Because of the presence of the first - order sea echoes with dominant amplitude , the doppler resolution technique which based on the range - velocity transformation is needed to extract the targets information in hf radar
高频雷达工作在拥挤的短波波段,由于绝对占优的一阶海浪回波的存在,必须采用基于距离?速度谱变换的多普勒频率分辨技术来处理杂波,以提取目标信息。 |
| 10. | Hf radar can measure the sea surface parameters . on oceanography , hf radar can be used in researching the property of ocean wave , supervising the sea status timely , getting offshore wind field picture as well
它在海洋学上可用于研究海浪性质，能实时监测海况而服务于航海业、海洋工程、海洋警戒、海洋渔业和海洋平台作业等，还能获取气象预报中所需要的海面风场图。 |
