标题： 校园环境中FR3低空信道的方向测量与分析 显示英文标题

标题： Directional Measurements and Analysis for FR3 Low-Altitude Channels in a Campus Environment

摘要： 在本文中，我们在户外校园环境中进行了FR3频段的低空信道测量。使用时域信道探测系统，我们进行了两种类型的测量：通过在26点屋顶路径上以一米间隔移动发射器（Tx）进行路径损耗测量，以及通过天线扫描在半功率波束宽度间隔内进行方向性功率角度谱测量。不同接收器（Rx）的路径损耗分析表明，近场模型优于传统的3GPP模型和高度校正变体，路径损耗指数接近自由空间值，表明视距占主导地位。功率角度谱测量显示，传播行为随环境条件显著变化。更近的接收器在向下倾斜发射器时对地面反射更敏感，而受阻链路由于主要散射效应表现出均匀的角特性，走廊环境产生非对称功率分布。这些结果表明，低空传播的特点是发射器高度与地面散射机制之间的复杂相互作用，为新兴中频段通信系统的信道建模提供了基本见解。 显示英文摘要

摘要： In this paper, we present detailed low-altitude channel measurements at the FR3 band in an outdoor campus environment. Using a time-domain channel sounder system, we conduct two types of measurements: path loss measurements by moving the transmitter (Tx) at one-meter intervals along a 26-point rooftop path, and directional power angular spectrum measurements through antenna scanning at half-power beam width intervals. The path loss analysis across different Rx shows that the close-in model outperforms conventional 3GPP models and height-corrected variants, with path loss exponents close to free space values indicating line-of-sight dominance. The power angular spectrum measurements show that propagation behavior varies significantly with environmental conditions. Closer Rx exhibit stronger sensitivity to ground reflections during downward Tx tilting, while obstructed links display uniform angular characteristics due to dominant scattering effects, and corridor environments produce asymmetric power distributions. These results indicate that low-altitude propagation is characterized by complex interactions between Tx height and ground scattering mechanisms, providing fundamental insights for channel modeling in emerging mid-band communication systems.