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首页> 外文期刊>Aerospace and Electronic Systems, IEEE Transactions on >High Fidelity Antenna Model Validation Results of a GNSS Multipath Limiting Antenna
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High Fidelity Antenna Model Validation Results of a GNSS Multipath Limiting Antenna

机译：GNSS多径限制天线的高保真天线模型验证结果

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摘要

The local area augmentation system (LAAS) is a proposed satellite-based landing system by the Federal Aviation Administration (FAA) to serve as a navigation aid for commercial aircraft during the approach and landing phase of flight. The LAAS utilizes a special ground-based antenna array called the multipath limiting antenna (MLA) to provide differentially corrected global navigation satellite system (GNSS) data to oncoming aircraft as well as to reduce the largest error contributor to pseudo-range estimates; the ground multipath. The performance of the MLA is characterized in terms of its desired-to-undesired (D/U) gain ratio, phase center variation (PCV) and group delay (GD). A high fidelity antenna model (HFAM) of the MLA is presented that estimates the D/U, PCV, and GD as a function of elevation angle. The model consists of two main components: 1) a microwave feed distribution circuit model created using a circuit simulator, and 2) a radiating structure model developed using a full-wave method of moments (MoM) field solver. The performance of the model was assessed against antenna range measurements. The results of the HFAM show good correlation for the D/U and PCV while a significant bias was observed on the results for the GD. The dependence of the GD on the radiating element's impedance, tuning process, and Doppler frequency shift are demonstrated via simulations.
机译：局域增强系统（LAAS）是美国联邦航空管理局（FAA）提出的基于卫星的着陆系统，在飞机进场和着陆阶段用作商用飞机的导航辅助设备。 LAAS利用一种称为多径限制天线（MLA）的特殊地面天线阵列，向即将到来的飞机提供经过差分校正的全球导航卫星系统（GNSS）数据，并减少对伪距估计的最大误差。地面多路径。 MLA的性能通过其期望到不想要的（D / U）增益比，相位中心变化（PCV）和组延迟（GD）来表征。提出了MLA的高保真天线模型（HFAM），该模型估计D / U，PCV和GD作为仰角的函数。该模型由两个主要部分组成：1）使用电路模拟器创建的微波进料分配电路模型，以及2）使用全波矩量法（MoM）场求解器开发的辐射结构模型。针对天线范围测量评估了模型的性能。 HFAM的结果与D / U和PCV具有良好的相关性，而GD的结果则有明显的偏差。通过仿真证明了GD对辐射元件阻抗，调谐过程和多普勒频移的依赖性。

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