Performance Measurement of 802.11a Wireless Links from UAV to Ground Nodes with Various Antenna Orientations

Field Experimentation of Cots-Based UAV Networking

“…Both radios of a ground node simultaneously receive packets broadcast by the UAV. Our measurements on throughput suggest that the pair of horizontal antennas that are orthogonal to the flight path perform better than others for most of UAV positions (see [6] for a detailed accounting of the measurement results). Based on these results, we can devise strategies for dynamic and automatic selection of optimal antenna pair to use during a UAV flight.…”

“…We would like to express our appreciation to those colleagues at AFRL and graduate students at Harvard who have helped design and implement the systems mentioned in this paper (see [4], [5] and [6]). …”

A multiple robot solution for urban reconnaissance

“…These were high power and VHF data modems. The use of 802.11a wireless links is a well researched method in use with robotics and UAVs (Cheng et al, 2006), and a high gain directional dish antenna on the FOV increased the effective range of the signal. When possible this aerial tracked a mesh node carried by one of the UAVs.…”

Underwater Robot Swarms: Challenges and Opportunities

“…To solve this problem many researchers working on collective robotics are compromising the longer range of radio modems for higher bandwidth devices (Hauert et al, 2010b;Hoffmann et al, 2004;De Nardi et al, 2006). It has become the new trend to use WIFI devices as they are small, cheap and have become easily available (Ahrens et al, 2009;Cheng et al, 2006;Kendoul et al, 2009;Lizarraga et al, 2008). However, due to the increase in portable wireless consumer products, we are already faced with the problem of frequency saturation of the allocated spectrum (Berne and Pogorel, 2003) and this is only going to get worse.…”