| 引用本文: | 李立勋,庞晶,陈华明,等.GNSS自适应天线相位中心评估方法.[J].国防科技大学学报,2016,38(2):87-91.[点击复制] |
| LI Lixun,PANG Jing,CHEN Huaming,et al.Phase center evaluation method in adaptive GNSS antenna[J].Journal of National University of Defense Technology,2016,38(2):87-91[点击复制] |
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| GNSS自适应天线相位中心评估方法 |
| 李立勋, 庞晶, 陈华明, 王飞雪 |
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(国防科技大学 电子科学与工程学院， 湖南 长沙 410073)
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| 摘要: |
| 自适应天线在波束形成过程中会引起天线相位中心变化，针对这一问题，提出一种基于可用波束的自适应天线相位中心评估方法。该方法分为三步：设置天线的可用波束门限；在干扰来向均匀分布下，得到天线可用波束门限内相位方向图集合；利用最小二乘法对相位方向图集合进行拟合得到自适应天线的平均相位中心变化量。运用该方法对四种典型的四元阵相位中心进行对比仿真，结果表明，算法可以快速有效地对自适应天线相位中心性能进行评估。另外，通过设置适当的可用波束门限，可以提高自适应天线的相位中心性能。算法的评估结果可以作为GNSS高精度自适应天线阵型选择依据。 |
| 关键词: 全球卫星导航系统 自适应天线 可用波束率 平均相位中心偏移量 平均相位中心变化量 |
| DOI：10.11887/j.cn.201602015 |
| 投稿日期：2015-03-07 |
| 基金项目:中国第二代卫星导航系统重大专项资助项目（GFZX0301020210） |
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| Phase center evaluation method in adaptive GNSS antenna |
| LI Lixun, PANG Jing, CHEN Huaming, WANG Feixue |
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(College of Electronic Science and Engineering, National University of Defense Technology, Changsha 410073, China)
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| Abstract: |
| Beam forming processing of adaptive antenna introduces the change of antenna phase center. In order to solve this problem, an evaluation method of adaptive antenna phase center on the basis of available beam was proposed. The method achieved the purpose in three steps: setting the available beam threshold; obtaining phase pattern set in available beam areas when the direction of interference signal distributed uniformly; fitting the phase pattern set to get the average phase center variations of adaptive antenna by using least square method. The method was validated by simulation under four typical four-elements-arrays. The analysis of simulated results indicates that the proposed method can be used to evaluate the phase center characters of adaptive antenna conveniently. What’s more, in order to fulfill the performance of high precision for adaptive antenna array, a choice is to reduce the available beam threshold. The research can be used as a guideline for choice of distributions of antenna elements in high-precision GNSS. |
| Keywords: global navigation satellite system adaptive antenna available beam ratio average phase center offset average phase center variation |
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