引用本文: | 曾祥华,李敏,聂俊伟,等.卫星导航系统中平台运动对天线阵列性能的影响分析.[J].国防科技大学学报,2011,33(1):95-99.[点击复制] |
ZENG Xianghua,LI Min,NIE Junwei,et al.Effects of Motion on Adaptive Array in Satellite Navigation Systems[J].Journal of National University of Defense Technology,2011,33(1):95-99[点击复制] |
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卫星导航系统中平台运动对天线阵列性能的影响分析 |
曾祥华, 李敏, 聂俊伟, 王飞雪 |
(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: |
常规的天线阵自适应算法侧重于研究稳态条件下的最优性能。当卫星导航接收机应用于运动载体(如炸弹、飞机、机动车辆、舰艇)时,阵列平台的运动(或振动)将会导致权值“零陷”指向与干扰来向失配。建立了运动条件下的阵列信号模型,将平台运动分为第一类平台运动(高频振动)和第二类平台运动(平稳转动),给出了两类
运动模型下阵列输出信干噪比的理论计算公式。仿真分析结果表明,阵列输出信干噪比对角度扰动比较敏感,而干扰强度影响较小,这是因为天线阵容易形成窄而深的零陷。对于卫星导航接收机常用的7元中心圆阵,当角度扰动为3°时,信干噪比损耗达到3.3dB。提高权值更新速率和扩展零陷宽度是增强抗干扰天线阵稳健性的有效手段。 |
关键词: 卫星导航系统 抗干扰 天线阵 平台运动 零陷 |
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Effects of Motion on Adaptive Array in Satellite Navigation Systems |
ZENG Xianghua, LI Min, NIE Junwei, WANG Feixue |
(College of Electronic Science and Engineering, National Univ. of Defense Technology, Changsha 410073, China)
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Abstract: |
Adaptive algorithms of antenna arrays usually focus on the optimal performance under stable conditions. If GNSS receivers are mounted on moving subjects (such as bombards, aircrafts, vehicles or ships), the movement or turbulence of the platform can make the “null” direction mismatch the interferer direction. The current researchis paper firstly establisheds an array signal model under platform motion, which wais classified into two types: the first motion type (high frequency turbulence) and the second motion type (stable tilting), Then it developeds the analytic formula of array output Signal-to-Interference-plus-Noise ratio (SINR) under two types of motion models. Simulation results show that the array output SINR is more sensitive to the arriving angle of the interferer than to its power, which is because the antenna usually forms narrow and deep nulls. For a 7-element antenna array with one element at center and other elements in a circle around the center, when the arriving angle of the interferer changes by 3 degrees, the loss of SINR reaches 3.3 dB. Improving weight updating rates and widening the null width are both effective means in improving the robustness of the anti-jamming antenna arrays. |
Keywords: satellite navigation systems anti-jammer antenna array moving platform null |
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