| 引用本文: | 吴舜晓,黄仰博,刘瀛翔,等.卫星导航天线阵的载波联合跟踪算法.[J].国防科技大学学报,2015,37(2):99-105.[点击复制] |
| WU Shunxiao,HUANG Yangbo,LIU Yingxiang,et al.Carrier joint tracking algorithm for antenna array in GNSS[J].Journal of National University of Defense Technology,2015,37(2):99-105[点击复制] |
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| 卫星导航天线阵的载波联合跟踪算法 |
| 吴舜晓, 黄仰博, 刘瀛翔, 欧钢 |
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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: |
| 测量卫星导航信号在天线阵各阵元上的载波相位之差可用于卫星波达方向解算，但传统的各阵元独立跟踪算法在干扰条件下无法实现高精度跟踪且容易失锁。针对此问题，通过将天线阵各阵元的载波相位分解为公共的平均载波相位和低动态的残余载波相位，提出了一种联合载波跟踪算法。该算法利用平均载波相位为每个阵元共有的特点，通过对全部阵元的联合处理来提高其跟踪精度，同时通过缩小环路噪声带宽来提高残余载波相位跟踪精度。理论分析与仿真结果表明，该算法提高了波达方向解算所需的阵元间载波相位差的测量精度及跟踪灵敏度，四阵元天线阵在典型应用条件下，跟踪灵敏度提高4dB，相同载噪比下载波相位差测量精度提高3倍。 |
| 关键词: 卫星导航 天线阵列 波束形成 波达方向估计 联合跟踪 |
| DOI：10.11887/j.cn.201502019 |
| 投稿日期：2014-09-11 |
| 基金项目:教育部新世纪人才支持计划资助项目（NCET-08-0144） |
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| Carrier joint tracking algorithm for antenna array in GNSS |
| WU Shunxiao, HUANG Yangbo, LIU Yingxiang, OU Gang |
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(College of Electronic Science and Engineering, National University of Defense Technology, Changsha 410073, China)
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| Abstract: |
| Carrier phase difference measurements for the same satellite navigation signal at each antenna array elements can be used to solve its direction of arrival (DOA). However, traditional tracking algorithms can only adopt separate tracking loops for each separate antenna element when moderate interference is present; these algorithms cannot obtain precise measurements and frequently become lose of lock. Aim to solve these problems, a joint carrier tracking algorithm which decomposed each element′s carrier phase to the common average part and the low dynamic residual part was proposed. For the average carrier phase, as it is commonly shared by each array element, its tracking accuracy can be improved by combining all the observation values of the whole array elements. For the residual carrier phase, its tracking accuracy can be improved by reducing the loop noise bandwidth. Theoretical analysis and numerical simulation show that the algorithm can significantly improve the measurement accuracy of carrier phase difference between elements needed by DOA estimation and tracking sensitivity. The tracking sensitivity of a 4 element antenna array with typical application conditions improves 4dB and the carrier phase difference measurement accuracy of it increases 3 times under the same carrier noise ratio. |
| Keywords: GNSS antenna array beam-forming direction of arrival estimation joint tracking |
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