In radio astronomy the polarimetric properties of radiation are often modified during propagation and reception. Effects such as Faraday rotation, receiver cross-talk, and differential amplification act to change the state of polarized radiation. A general description of such transformations is useful for the investigation of these effects and for the interpretation and calibration of polarimet...

We introduce the vertical profile of atmospheric conductivity in the range from 2 to 98 km. The propagation constant of extremely low frequency (ELF) radio waves was computed for this profile by using the full wave solution. A high correspondence is demonstrated of the data thus obtained to the conventional standard heuristic model of ELF propagation constant derived from the Schumann resonance...

Introduction This paper will discuss many of the theoretical and physical principles that underlie the operation of radar systems. The word radar is derived from an acronym for radio detection and ranging. Radar is an electronic and electromagnetic system that uses radio waves to detect and locate objects. Radar operates by transmitting a particular kind of radio frequency waveform and detectin...

pertinent to the prospective atmospheric propagation effects Satellite Propagation in the 20to 30GHz Frequency Range, IEEE Trans. Ant. Prop. Ippo1ito, L. J., R. D. Kau1 , and R. G. Na11ace, Propagation Handbook for Sate11ite. Systems Design, A Summary of Propagation Impairments on 10 to 100 GHz Sate11ite. DESCANSO NASA Propagation Program. Propagation Effects Handbook for Satellite Systems Desi...

The complexity of current HF radio networks (such as the SCOPE Command HF Global Communications System) has renewed interest in techniques for efficiently simulating long-haul HF radio networks. Because the dynamic propagation effects of skywave paths are the distinguishing characteristic of HF network simulations, we need to accurately simulate the connectivity among HF stations. Predictions o...

The global migration of television (TV) from analogue to digital broadcasting will result in more spectrum bands (known as TV white space), previously used in analogue broadcasting, becoming available and unoccupied. A question is on how much white space is available and how can it be used opportunistically and dynamically without causing harmful interference to licensed users? In this paper, w...

Noise mapping of urban areas according to standardized engineering calculation methods systematically results in an underestimation of noise levels at areas shielded from direct exposure to noise, such as inner yards. In these methods, road traffic lanes are represented by point sources and noise levels are computed utilizing point-to-point propagation paths. For a better prediction of noise le...

This paper proposes a Multi-hop Radio Access Cellular (MRAC) scheme for achieving both highspeed/high-capacity and good area coverage in fourth generation mobile communications systems. In this scheme, we assume two kinds of hop stations, one is a dedicated repeater station installed at a good propagation location such as a rooftop, and the other is a user terminal that temporarily experiences ...

Wireless and mobile broadband communication systems are planned to operate at the mm-wave band, due to the spectrum availability and wider bandwidth requirements. It is important to characterize the radio propagation channel to ensure satisfactory performance of a wireless communication system. This paper classifies the propagation models and discusses the importance of indoor propagation model...

Existing methods based on statistical models ignore the detail effect of real environment path loss, leading to some discrepancies with actual results in urban environments. In order reduce and improve unmanned aerial vehicle (UAV) coverage effect, a multi-UAV method deterministic radio wave propagation is proposed. First, ray-tracing method, as one models, used simulate loss. Next, cooperative...