AI 中文总结
研究FR3频段多频段ISAC中日常物体频率各向异性，通过校准矢量网络分析仪收集数据，处理信道冲激响应等量化多频段相干性，揭示了随物体类型和视角变化的复杂相干结构，强调设计中需考虑频率各向异性。
AI 中文摘要
随着集成传感与通信（ISAC）系统向更高传感分辨率发展，多频段处理成为关键推动因素，其中FR3频段（7 - 24GHz）因宽带宽和良好传播特性脱颖而出。现有多频段ISAC技术假设目标为频率不变点散射体，但实际物体有频率依赖散射机制和迁移散射中心，该假设在宽分数带宽下不成立。本文利用校准矢量网络分析仪在6 - 24GHz频段收集的10个物体、120个视角的信道测量数据，首次对日常物体用于ISAC的频率各向异性进行系统实验表征。通过处理双基地信道冲激响应和合成孔径雷达图像量化多频段相干性，提取跨频段相关系数实部。结果揭示了复杂且随物体类型和视角大幅变化的相干结构，凸显多频段ISAC系统设计中考虑频率各向异性的必要性。
英文摘要
As Integrated Sensing And Communication (ISAC) systems push toward higher sensing resolution, multi-band processing has emerged as a key enabler, with Frequency Range 3 (FR3) (7-24 GHz) standing out for its combination of wide bandwidth and favorable propagation. A common assumption underlying existing multi-band ISAC techniques is that targets behave as frequency-invariant point scatterers, enabling coherent combination of measurements across widely spaced subbands. However, this assumption does not hold over wide fractional bandwidths, since real objects exhibit frequency-dependent scattering mechanisms and migrating scattering centers. This paper provides the first systematic experimental characterization of the frequency anisotropy of everyday objects for ISAC, using channel measurements collected with a calibrated vector network analyzer over the 6-24 GHz band, across 10 objects and 120 viewpoints. We process bistatic channel impulse responses and synthetic aperture radar images to quantify multi-band coherence, extracting the real part of the cross-band correlation coefficient. Our results reveal complex, non-trivial coherence structures that vary substantially with object type and viewing angle, highlighting the need to account for frequency anisotropy in multi-band ISAC system design.
Comments7 pages, 7 figures, 1 table
