Measurement-Based Characterization and Modeling for Low-Altitude UAV Air-to-Air Channels

Measuring Receiver Diversity on a Low-Altitude UAV in a Ground-to-Air Wireless Mesh Network

We consider the problem of mitigating a highly varying wireless channel between a ground node transmitting to a small, low-altitude unmanned aerial vehicle (UAV) in a wireless mesh network. One approach is to use multiple receiver nodes on the UAV that exploit the channel’s spatial/temporal diversity and that cooperate to improve overall packet reception. We present a series of measurement stud...

Uav for Mapping —low Altitude Photogrammetric Survey

Two kinds of platform are accepted for mapping UAV system. One is remotely-piloted aircraft. Another is unmanned helium airship. A super-wide-angle camera is constructed by four digital cameras, mounted in different optical axis directions. A high accuracy calibration method is used to make compensation for the deformed errors due to the light and simple constructed mechanical frame. According ...

Progress in Air to Air Channel Modeling

Passive Energy Air-to-Water Heat Pipe Based Heat Exchanger and its Potential of Air Pre-cooling in Air Conditioning Systems for Iran Climate

Air pre-cooling equipment is normally being employed in air-conditioning systems for pre-cooling the ambient outdoor air to enhance the air-conditioning systems performance. In this study, the potential of a passive water-to-air heat pipe based heat exchanger (HPHEX) for air pre-cooling purpose in air-conditioning systems for the high cooling load demanding regions of Iran was investigated. To ...

Detection of low Intraperitoneal Air

Perforation of a hollow viscus is an acute abdominal drama and the accurate diagnosis highly depends on demonstration of free intra­pritoneal air. The importance of adequate examination in the demonstration of ,tiny amount ()ff air is stressed and the value of an upright chest film when the horizontal beam is tangential to the top of the diaphragm is mentioned. Before standing for chest x-ray t...