VHF/ UHF Building Penetration Characteristics When Using Low Antenna Heights

Turney, W.; Karam, M.; Malek, L.; Buchwald, Gretel

doi:10.1109/dyspan.2007.89

Cited by 4 publications

(1 citation statement)

References 5 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…A unique companion study measured signal strength into buildings before and after collapse, and the results show a generally increasing attenuation and high variability after collapse, although enhancement of propagation is possible in some cases [76]. Other penetration studies include upper VHF and UHF building penetration for short range emergency response [77], [78], and LEOS penetration at 137 MHz [79].…”

Section: E Low Frequency Penetration Into Structuresmentioning

confidence: 99%

Low Frequency Multi-Robot Networking

Sadler,

Dagefu,

Twigg

et al. 2024

IEEE Access

View full text Add to dashboard Cite

Autonomous teams of unmanned ground and air vehicles rely on networking and distributed processing to collaborate as they jointly localize, explore, map, and learn in sometimes difficult and adverse conditions. Co-designed intelligent wireless networks are needed for these autonomous mobile agents for applications including disaster response, logistics and transportation, supplementing cellular networks, and agricultural and environmental monitoring. In this paper we describe recent progress on wireless networking and distributed processing for autonomous systems using a low frequency portion of the electromagnetic spectrum, here defined as roughly 25 to 100 MHz with corresponding wavelengths of 3 to 12 meters. This research is motivated by the desire to support autonomous systems operating in dense and cluttered environments by harnessing low frequency propagation, where meters long wavelengths yield significantly reduced scattering and enhanced penetration of obstacles and structures. This differs considerably from higher frequency propagation, requiring different low frequency propagation models than those widely employed for other bands. Progress in use of low frequency for autonomous systems has resulted from combined advances in low frequency propagation modeling, networking, antennas and electromagnetics, geolocation, multi-antenna array distributed beamforming, and mobile collaborative processing. This article describes the breadth and the depth of interaction between areas, leading to new tools and methods, especially in physically complex indoor/outdoor, dense urban, and other challenging scenarios. We bring together key results, models, measurements, and experiments that describe the state of the art for new uses of low frequency spectrum for multi-agent autonomy.

show abstract