| 宽带双极化天线测量探头的设计与仿真 |
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| 引用本文： | 陈成波,石明江,李魏.宽带双极化天线测量探头的设计与仿真[J].宇航计测技术,2017,35(6):48-51. |
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| 作者姓名： | 陈成波 石明江 李魏 |
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| 作者单位： | 1、国防科技大学信息通信学院，西安 710106；;
2、西安电子科技大学天线与微波技术国家重点实验室，西安 710071 |
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| 基金项目： | 国家自然科学基金资助项目（21204139）；四川省教育厅面上项目（11ZB020） |
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| 摘 要： | 天线测量探头的性能对提升天线平面近场测量效率、最终测量结果的精度具有重要意义。针对平面近场测量的需要，应用反向四脊和差分馈电技术，设计了宽带双极化天线测量探头。对测量探头模型进行仿真，分析了带宽、方向图、隔离度和交叉极化辨识度等探头性能，确定了高隔离度、高极化纯度的宽带双极化天线测量探头的最优设计，获得了更高精度和效率的天线测量。
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| 关 键 词： | 探头 宽带 双极化 天线测量 |
Application of Improved Wavelet Threshold De-noising Method in Pipeline Leakage Detection |
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| CHEN Cheng-bo,SHI Ming-jiang,LI Wei.Application of Improved Wavelet Threshold De-noising Method in Pipeline Leakage Detection[J].Journal of Astronautic Metrology and Measurement,2017,35(6):48-51. |
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| Authors: | CHEN Cheng-bo SHI Ming-jiang LI Wei |
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| Institution: | 1、The Information and Communications College of National University of Defense Technology, Xi′an 710106,China；;
2、Xidian University National Key Laboratory of Antennas and Microwave Technology, Xi′an 710071,China |
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| Abstract: | Negative pressure wave signal denoising is one of the core issues to be solved in pipeline leakage detection method based on negative pressure wave. A comparison among traditional hard and soft threshold function, hyperbolic and exponential algorithm and improved algorithm has been made on the basis of analyzing wavelet transform theory and wavelet threshold denoising. The results of experiment show that improved algorithm used in pipeline leakage detection processing could obtain a larger SNR (signal to noise ratio) and a good denoising ability for negative pressure wave signal, which could effectively improve leakage detection accuracy. |
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| Keywords: | Pipeline leakage Wavelet transform Threshold de-noising Improved algorithm |
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